Honeywell Midas Operating Manual

Midas Gas Detector

Operating Instructions

• TOC

• General Description

• Product Overview

• Default Conﬁguration

• Installation

• Detector Start-up

• General Operation

• Navigating Menus

• Routine Maintenance

• Pyrolyzer Module Options

• LonWorks® Interface

• Troubleshooting/Faults

• Reﬂex

• Internal Web Server

• Installation Topologies

• Ordering Information

• Speciﬁcations

• Calibration/Bump Testing

• Modbus/TCP Interface

®

• Gas Tables

• Warranty

Midas® Gas Detector

Table of Contents

Contents 1 General Description

1 General Description �� 1-2

2 Product Overview

2 Product Overview �� 2-2

2�1 Main Chassis �� 2-2

2.1.1 Display ............................................................................................................ 2-2

2.1.2 Pump Module .................................................................................................. 2-3

2.1.3 Sensor Cartridge Chamber ............................................................................. 2-3

2�2 Mounting Bracket Assembly �� 2-3

2.2.1 Mounting Bracket ............................................................................................ 2-4

2.2.2 Terminal Module .............................................................................................. 2-4

2�3 Sensor Cartridge �� 2-4

2.3.1 Biased Sensor Cartridges ............................................................................... 2-4

2�4 Cover �� 2-5

3 Default Configuration

3 Default Configuration �� 3-2

4 Installation

4 Installation �� 4-2

4�1 Mounting and Location of Detector �� 4-2 4�2 Mechanical Installation �� 4-4 4�3 Sample and Exhaust Tubing Calculations �� 4-7 4�4 In-line Filters �� 4-8 4�5 Local Detector Option �� 4-8 4�6 Electrical Installation �� 4-8 4�7 Electrical Connections �� 4-11 4�8 Refitting the Main Chassis �� 4-23 4�9 Installing the Sensor Cartridge �� 4-23

5 Detector Start-Up Procedures

5 Detector Start Up Procedures �� 5-2

Midas Technical Handbook

i

Midas® Gas Detector

6 General Operation

6 General Operation �� 6-2

6�1 Normal Operation Mode �� 6-2

6.1.1 Resetting Alarms, and Faults .......................................................................... 6-4

6�2 Review Mode �� 6-4

6.2.1 Review Mode Menu Overview ................................................................... 6-4

6�3 Overview of Set-up, Calibration and Test Mode �� 6-6

6.3.1 Set-up Menu Overview .............................................................................. 6-6

6.3.2 Calibration Menu Overview ‘ CAL’ ......................................................................... 6-8

6.3.3 Test Menu Overview ‘ tESt’ ........................................................................ 6-9

7 Detailed Procedures for Navigating Mode Submenus

7 Detailed Procedures for Navigating Mode Submenus ��7-2

7�1 Review Mode �� 7-2

7.1.1 Review Software ‘SW’ ..................................................................................... 7-2

7.1.2 Review Alarms ‘ ALm’ .................................................................................. 7-2

7.1.3 Review Faults ‘ FLt’ ..................................................................................... 7-3

7.1.4 Review Calibration ‘ CAL’ ................................................................................ 7-3

7.1.5 Review Date and Time ‘timE’ ........................................................................... 7-3

7.1.6 Review Detector Address ‘ nEt’ ....................................................................7-3

7.1.7 Review Event Log ‘ Hi St’ .......................................................................... 7-4

7.1.8 Review LCD Backlight Mode ‘LCD’ ................................................................. 7-4

7�2 Set-up, Calibration and Test Modes �� 7-4

7.2.1 Set-up Menu ‘ SEt’ ........................................................................................ 7-5

7.2.2 Set Alarms ‘ ALm’ .......................................................................................... 7-5

7.2.3 Set Faults ‘ FLt’ .............................................................................................. 7-6

7.2.4 Set Calibration Interval ‘ CAL’ ......................................................................... 7-7

7.2.5 Set Date and Time ‘timE’ ................................................................................. 7-7

7.2.6 Set Address ‘ nEt’ ........................................................................................ 7-8

7.2.7 Set pass code ‘ PWd’ .................................................................................... 7-8

7.2.8 Set LCD Backlight mode ................................................................................. 7-9

Midas Technical Handbook

ii

Midas® Gas Detector

7.2.9 Set Pump control frequency ............................................................................ 7-9

7�3 Calibration Menu ‘ CAL’ �� 7-10

7.3.1 Zero Calibration ‘ 0CAL’ ................................................................................. 7-10

7.3.2 Span Calibration ‘ SPAn’ ............................................................................... 7-10

7.3.3 Flow Calibration ‘ FLoW’ ................................................................................ 7-11

7.3.4 mA Calibration ‘mA 4-20’ ............................................................................... 7-12

7�4 Test Menu ‘ tESt’ �� 7-13

7.4.1 Bump Test ‘ bUmP’ ....................................................................................... 7-13

7.4.2 Alarm/Fault Test ‘ SIm’ ................................................................................ 7-13

7.4.3 Inhibit State ‘ InH’ ....................................................................................... 7-14

7.4.4 Stimulate 4-20mA ‘4-20 mA’ .......................................................................... 7-14

8 Routine Maintenance

8 Routine Maintenance �� 8-2

8�1 Sensor Cartridge Replacement �� 8-3

8.1.1 Sensor Cartridge Fitting/Replacement ............................................................ 8-3

8�2 Pump Replacement �� 8-4 8�3 Reassembling the Detector �� 8-5 8�4 Filter Replacement �� 8-6 8�5 System Leak Check Procedure �� 8-7

9 Pyrolyzer Module Options

9 Pyrolyzer Module Options �� 9-2

9�1 Fitting the Pyrolyzer Module �� 9-4 9�2 Reassembling the Detector �� 9-6 9�3 Configuring the Detector �� 9-7 9�4 Replacing the Pyrolyzer Heater Block �� 9-7

10 Optional LonWorks® Interface Installation

10 Midas LonWorks® Interface Module �� 10-2

10�1 LonWorks® Installation �� 10-2

10.1.1 Fitting the LonWorks® Module .................................................................... 10-2

10.1.2 Wiring the Midas® for LonWorks® ............................................................... 10-3

10.1.3 Configuring the Midas® for LonWorks® ...................................................... 10-3

Midas Technical Handbook

iii

Midas® Gas Detector

10�2 LonWorks® Software �� 10-4

10.2.1 LonWorks® Overview ................................................................................... 10-4

10.2.2 Network Variable Behaviors ........................................................................ 10-5

10.2.3 Other Characteristics .................................................................................. 10-9

11 Troubleshooting and Fault Diagnosis

11 Troubleshooting and Fault Diagnosis �� 11-2

12 Reflex

12 REFLEX® �� 12-2

13 Internal Web Server

13 Internal Web Server �� 13-2

14 Typical Installation Topologies

14 Typical Installation Topologies �� 14-2

15 Ordering Information

15 Ordering information �� 15-2

16 Specifications

16 General Specifications �� 16-2

17 Calibration and Bump Testing

17 Calibration and Bump Testing �� 17-2

A Modbus® / TCP Interface

®

13�1 Physical Network Components �� 13-2 13�2 Internet Settings �� 13-2 13�3 Running the Web Browser �� 13-4

14�1 Conventional Installation �� 14-2 14�2 Modbus/TCP Installation �� 14-3 14�3 Power over Ethernet (PoE) Installation �� 14-3

15�1 Midas® Transmitter �� 15-2 15�2 Midas® Pyrolyzer for NF3 �� 15-2 15�3 Midas® High-Temperature Pyrolyzer for Perfluoro Compounds �� 15-2 15�4 Midas® LonWorks® Module �� 15-2 15�5 Midas® Complete Gas Detector Kits �� 15-3 15�6 Accessories and Spares �� 15-4

Midas Technical Handbook

iv

Midas® Gas Detector

A Modbus/TCP Interface ��A-2

A�1 Reading Status from the Midas® ��A-2 A�2 Sending Commands to the Midas® ��A-5

A�3 Determining the MAC Address ��A-6 B Gas Tables C Warranty Statement

C Warranty Statement ��C-2

Sensor Cartridge Warranty ��C-3

Pyrolyzer Warranty ��C-3

Midas Technical Handbook

v

Midas® Gas Detector

1 General Description

Midas Technical Handbook

1-1

Midas® Gas Detector

1 General Description

The Midas® gas detector is an extractive gas sampling system that draws a sample locally or from a remote point to a sensor cartridge that is located inside the detector’s chassis. A wide range of Asphyxiant, Toxic, Flammable, Pyrophoric, Corrosive, and Oxidizer (including Oxygen) gas sensor cartridges are available that enable detection of gases used or generated in the Semiconductor and other industries.

Midas® is wall mounted and displays gas concentration, alarm, fault and status information via its backlit LCD and LEDs. A simple to use 4-button keypad located under the display provides the facility to set-up, review, operate and make changes to the detector’s conﬁguration.

Midas® has ﬂexible power and communications capabilities built in as standard. These include 3 on board relays, 0-21 mA analog output, Modbus/TCP outputs for signal and service connectivity as well as the innovative Power over Ethernet (PoE) connection that enables a single Ethernet connection to be made for all power, control and communication requirements. An optional LonWorks® interface is available.

Midas Technical Handbook

1-2

Midas® Gas Detector

2 Product Overview

Midas Technical Handbook

2-1

Midas® Gas Detector

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2 Product Overview

The Midas® gas detector comprises of 4 parts: the main chassis, the mounting bracket assembly, the sensor cartridge and the unit cover. Diagram 2-1 details the Midas® general arrangement. Additionally, optional Pyrolyzer modules for the detection of NF3 or various PFCs and an optional LonWorks® module are available. Please refer to Section 9 and 10 respectively for details of these options.

Diagram 2-1� Midas® general arrangement exploded view

2�1 Main Chassis

The main chassis comprises of the display, pump assembly, and plug in sensor cartridge chamber.

Diagram 2-2� Main chassis

Service Port

Display

Pump module

Sensor cartridge chamber

Caution

The Service Port is only for use with approved connectors by Honeywell Analytics service personnel operating a system diagnostic� Unauthorized connection to this port may lead to damage of the Midas® and external equipment and will not be covered by the normal product warranty conditions�

2�1�1 Display

The display is located at the front of the main chassis and consists of a large alphanumerical and graphical backlit LCD, 3 LED indicators and a 4-button keypad. Under normal operation the LCD and LEDs display gas concentration, alarm and system status. In set-up, review, calibration and test modes, the LCD shows the relevant menu options. These menus are simply navigated using the ‘s’ up, ‘t’ down, ‘3’ accept and ‘X’ cancel buttons.

Midas Technical Handbook

2-2

Midas® Gas Detector

Diagram 2-3� Midas® display module layout

1

21

1

20

3

1

2

4

MDA Scientific Midas

1

16

18

1

17

19

1

5

7

1

6

8

1

12

14

1

13

15

2�1�2 Pump Module

1. Red alarm LED

2. Normal operation icon

3. Review mode icon

4. Green power LED

5. Set-up mode icon

6. Calibration mode icon

7. Yellow Fault LED

8. Test mode icon

9. Gas concentration and

1

9

1

10

1

11

message display area

10. Displayed units

11. Pass code icon

12. Accept button

13. Network icon

14. Down button

15. Inhibit icon

16. Fault icon

17. Up button

18. Alarm level 1 icon s Alarm level 2 icon (For ﬂammable and toxic)

Depletion level 1 icon t Depletion alarm level 2

19. Cancel button

20. Zero and Span calibration icons

21. Flow indicator

The pump module is located at the back of the main chassis. It draws the gas sample from the inlet port located at the bottom of the mounting bracket assembly via an inline ﬁlter to the sensor cartridge chamber located at the front of the main chassis. The inline ﬁlter is to protect the elements after the sensor. The sample goes from the inlet straight to the sensor face, and then through the rest of the ﬂow system. The sample is then exhausted via the exhaust port located at the bottom of the mounting bracket assembly. The pump and ﬁlter assemblies are designed for easy replacement. For replacement details refer to Sections 8.2 and 8.4 respectively.

2�1�3 Sensor Cartridge Chamber

The sensor cartridge chamber is located at the front of the main chassis below the display module. The plug in sensor cartridge is ﬁtted into this area which makes the electrical connection between the sensor cartridge and the rest of the electronics as well as providing the chamber where the sensor cartridge is exposed to the sampled gas. This connection is lightly lubricated for ease of sensor replacement. Avoid contact of sensor cartridge chamber with contaminants (such as dust and debris). For details of ﬁtting sensor cartridge refer to Section 4.9.

2�2 Mounting Bracket Assembly

The mounting bracket assembly comprises of the detector mounting bracket, the terminal module, the gas sample inlet and outlet ports, the cable/conduit entry and Ethernet (Modbus/TCP) communications socket.

Diagram 2-4� Mounting bracket assembly

Mounting bracket

Cable entry

Ethernet/PoE socket

Terminal module

Gas inlet port

Gas outlet port

Midas Technical Handbook

2-3

Midas® Gas Detector

REMOVE

AT TIME OF

INSTALLATION

2�2�1 Mounting Bracket

The metal mounting bracket has two slots that allow the detector to be easily mounted to a wall using two suitable screws (DIN rail or horizontal mounting options are also available). For further details of mounting the detector refer to Section 4.

2�2�2 Terminal Module

The terminal module is located on the mounting bracket. All electrical connections to Midas® are made via this module. Wire entry to the terminal module area is via the PG16 cable entry/conduit entry located at the bottom of the mounting bracket assembly.

2�3 Sensor Cartridge

A wide range of Flammable, Pyrophoric, Corrosive, and Oxidizer (including Oxygen) sensor cartridges can be ﬁtted to Midas®. The plug in sensor cartridges are ﬁtted in the sensor cartridge chamber at the front of the main chassis. To access the chamber the unit cover is removed by unscrewing the thumbscrew located at the front of the detector. The pre-calibrated smart sensor cartridges can easily be ﬁtted or replaced as they simply plug into the detector without the need for any tools. The sensor cartridge is ﬁrmly held in place by two locking tabs. Some cartridges are shipped with a protective cap to shield them from contaminants during shipping. This cap must be removed before inserting the cartridge into the Midas® unit, failure to do so may damage the Midas® transmitter.

Diagram 2-5� Sensor cartridge

Locking tabs

Front Back

Protective Cap (remove before use)

Connector

2�3�1 Biased Sensor Cartridges

Some sensor cartridges are shipped with a battery powered electrical supply in order to keep the cell effectively ‘warmed up’ and ready to monitor once installed in the Midas® unit. Battery powered bias circuits are supplied for TEOS, NO, and CO2. The bias circuit is removed just before insertion into the Midas® system and the sensor cartridge is thus ready sooner for effective gas detection.

Should a bias voltage not be applied (e.g. during a power failure), the cell will take a longer time to recover before effective gas detection can take place. The longer the loss of applied power, the longer the recovery time. During this recovery time, there is a chance for false/inaccurate readings. Refer to the relevant sensor cartridge data sheet for information on each sensor cartridge.

Midas Technical Handbook

In order to avoid the risk of loss of gas detection due to unforeseen power loss, we recommend that a power management solution such as uninterruptible power supplies are used.

2-4

Midas® Gas Detector

Sensor Cartridge

Note

Sensor warranty is void if the sensor cartridge is opened by unauthorized user.

Diagram 2-6� Biased Sensor�

2�4 Cover

The standard cover provides environmental protection and ﬁts over the top, front and sides of the main chassis. The front panel has viewing windows for the LCD, LEDs and sensor cartridge ﬁtted in the sensor cartridge chamber. Underneath the LCD window are the 4 push buttons used for navigating the detector’s software menus. The cover is easily removed to allow access to the chassis by unscrewing the thumbscrew on the front panel and pulling the cover forwards off the main chassis.

Midas units ﬁtted with a pyrolyzer utilize a ventilated cover due to the high temperatures generated by the pyrolyzer unit (See Diagram 2-7)

Diagram 2-7� Midas® covers

LED Windows

LCD Window

Pushbuttons Sensor Cartridge viewing window

Thumbscrew

Standard Cover

LED Windows

LCD Window

Pushbuttons

viewing window

Thumbscrew

Ventilated Pyrolyzer Cover

Midas Technical Handbook

2-5

Midas® Gas Detector

3 Default Conguration

Midas Technical Handbook

3-1

3 Default Conguration

As standard, the Midas® gas detector is factory conﬁgured as below:

Table 3-1� Midas® default conguration

1.0 mA Fault

Current source with:

2.0 mA Inhibit

3.0 mA Maintenance Fault

4.0 to 20.0 mA Gas reading (normal operation)

21.0 mA Over range

Toxic Gas Flammable Gas Oxygen

Midas® Gas Detector

Full Scale (FS)

Lowest Alarm Level (LAL)

Lower Detectable Limit

(LDL)

Alarm 1

(Relay 1)

Alarm 2

(Relay 2)

Fault

(Relay 3)

Latching

Pass code

IP Address

®

1

Midas

detectors are not ETL approved for monitoring in or sampling from classied areas above 25% LEL

Typically 4 x Threshold Limit

Value (TLV)

Typically 1/2 TLV 10% LEL 5% v/v

Typically 0.4 TLV 9% LEL 0% v/v

The LDL is the minimum level that is reliably distinguishable from zero.

1/2 TLV 10% LEL 23.5% v/v (Rising)

Contact Normally Open (NO), closes on alarm.

TLV 20% LEL 19.5% v/v (Falling)

Contact Normally Open (NO), closes on alarm.

Contact Normally Open (NO). Instrument Fault Only

Latching. Alarm and fault relays DO NOT automatically reset when reading falls below alarm

thresholds. Relays MUST be manually reset.

169.254.60.47 subnet mask 255.255.255.0

100% Lower Explosive Limit

Normally de-energized, energizes on alarm.

Normally energized, de-energizes on fault.

No pass code set.

(LEL)

1

25% Volume (v/v)

See Table 7-3 for more information on Relay Conﬁguration

Midas Technical Handbook

3-2

Midas® Gas Detector

4 Installation

Midas Technical Handbook

4-1

Midas® Gas Detector

4 Installation

For ease of installation Midas® has been designed to allow the installation of the mounting bracket assembly and terminal module separately from the other parts of the detector. The detector location and

hard wiring can therefore be completed before tting

the detector’s main chassis and sensor cartridge.

WARNING

Midas® is designed for installation and use in indoor safe area non-explosive atmospheres� Installation must be in accordance with the recognized standards of the appropriate authority in the country concerned� Prior to carrying out any installation ensure local

regulations and site procedures are followed�

Diagram 4-1. Midas® outline dimensions

5.91 in [150.00mm]

MDA Scientific Midas

4�1 Mounting and Location of Detector

The Midas® gas detector has an integral mounting bracket assembly that is easily mounted to a suitable vertical surface such as a wall, tool housing, mounting plate on a pole etc.

Drill Template

Drill 2 x M4 holes

2�3 in (58�50mm)

honeywell

PN: MIDAS-E-CDX SN: 12K-48397 Activate by 24-Nov-12

honeywell

2.48 in [63.00]

Midas Technical Handbook

z

zellweger analytics

GAS DETECTOR

4.72 in [120.00mm]

4-2

Note

This drill template is not to scale. The Midas Quick Start Guide (MIDAS-A-020) contains a full scale drawing.

Ensure all measurements are correct before using as an actual drill template.

Use 2 x M4 Screws or equivalent for mounting (head size 6-12 mm (1/4” - 1/2”))

Midas® Gas Detector

Note: Heat shield not present on all pyrolyzers.

3.9 in.

(98 mm)

3.9 in. (205 mm)

Midas-A-039

9.6 in.

(244 mm)

5.2 in.

(132 mm)

2.4 in. (60 mm)

Midas® Transmitters and Pyrolyzers

Midas-T-OOP

MDA Scientific Midas

honeywell

PN: MIDAS-E-CDX SN: 12K-48397 Activate by 24-Nov-12

honeywell

6.0 in (152 mm)

3.2 in

(83 mm)

2.3 in. (59 mm)

7.9 in (201 mm)

3.2 in

(81 mm)

2.5 in (62 mm)

Midas-T-HTP

Midas Technical Handbook

4-3

8.2 in.

(209 mm)

9.1 in. (233 mm)

4.4 in. (113 mm)

5.5 in.

(140 mm)

4.0 in. (101 mm)

Midas® Gas Detector

Below are some considerations when installing the Midas® Gas Detector:

1. Mount the detector on a surface that is flat, firm and suitable for its size and weight.

2. Use the drill template supplied to drill the holes for the fixings.

3. Use fasteners appropriate for the surface being mounted to.

4. Ensure the head size of fastener used will not snag the terminal PCB 6-12 mm (.25 in - .5 in).

5. Consider the conduit/cable weight and its stress on the installation.

6. Position the detector so that it can be easily accessed.

7. Position the detector so that it is at a suitable height (normally eye level) for the display to be clearly seen.

8. Take into consideration the space required to remove the detector’s cover and locking/ unlocking the sensor cartridge locking clips. Minimum recommended spacing between multiple Midas® units is 82 mm (3.23 in).

9. Take into consideration the space required for sample inlet and exhaust tubing (for remote monitoring), and for the inlet filter (for local monitoring).

10. Take into consideration the space required for cable or conduit access.

4�2 Mechanical Installation

The following steps and diagrams show how to separate the mounting bracket assembly from the main chassis and mount it on a vertical flat surface.

1. Unscrew the thumbscrew located on the front panel.

2. Remove the cover by pulling it forwards off the main chassis. Be sure to remove the internal packing card securing the pump. Failure to remove this packing will result in damage to the Midas® unit. (See Diagram 4-2)

3. Unscrew the two retaining screws located at the bottom front of the chassis.

4. Holding the mounting bracket assembly with one hand use the other to carefully pull the main chassis forward to disconnect it from the mounting bracket assembly.

5. Using the drill template provided drill two holes

58.50 mm vertically apart for 2 x round head M4 fixing screws.

6. Partially screw the fixings into the mounting surface.

7. Place the mounting bracket assembly over the screws so they pass through the mounting holes and then slide down to locate in the slots.

8. Tighten the screws to secure the mounting bracket assembly.

Midas Technical Handbook

4-4

Removing cover

Midas® Gas Detector

Diagram 4-2� Mechanical installation

chassis

Removing chassis

mounting bracket

chassis

TICE !

IMPORTANT NO

ve internal

ore

Remo

shipping protection from

the pump module brf

installation

Internal packing card

Remove before use.

loosen

cover

Chassis Mounting Screws

mounting bracket

IMPORTANT NOTICE !

Remove internal

shipping protection from the pump module brfore

installation

Internal packing card

Remove before use.

Midas Technical Handbook

4-5

Midas® Gas Detector

screws

Optional Midas

Diagram 4-3. Mechanical installation

mounting bracket

Standard Midas® Wall Mount

®

Pyrolyzer Adjustable “L” Bracket Mount

(MIDAS-A-032)

DIN Rail Bracket

Spacer Bracket

2x M4 Screws Secures Midas Spacer Bracket

®

to

Optional Midas® DIN Rail

Mount (MIDAS-A-036)

4x M3 Screws Secures DIN Rail to Spacer Bracket

MDA Scientific Midas

honeywell

PN: MIDAS-E-CDX SN: 12K-48397 Activate by 24-Nov-12

honeywell

Top Access Tubing Connector

(MIDAS-A-031)

Midas Technical Handbook

Note:

When using the Adjustable “L” bracket with the HighTemperature Pyrolyzer unit, (2) Top Access Tubing Connectors (MIDAS-A-

031) must be used to insure proper operation.

Optional Midas® Adjustable “L” Bracket Mount

(MIDAS-A-032)

4-6

Midas® Gas Detector

4�3 Sample and Exhaust Tubing Calculations

The following tables show the flow rate, tubing length, transport time, and maximum pressure and vacuum at the inlet and exhaust points. Tubing lengths vary among gases. See Appendix B for recommended lengths.

Table 4-1. Inlet sample specications

Inlet Sample Specifications:

Maximum

Tubing Length, m (ft)

Transport Time (sec), ID 1/8”

Transport Time (sec), ID 3/16”

Sample Point Vacuum (Negative pressure)

Flow rate, cc/min.

Tubing OD, mm (in)

Tubing ID, mm (in)

1

Honeywell Analytics recommends the thick-wall tubing (1/8”

ID) for best speed of response.

2

The ow rate is electronically maintained at approximately

500 cc/min and may vary within acceptable tolerances.

Table 4-2. Outlet sample specications

Outlet Sample Specifications:

Tubing Length, m (ft)

Back Pressure at Exhaust Point (Excluding tubing)

Tubing OD, mm (in)

Tubing ID, mm (in)

30 (100) 20 (66) 10 (33) 0

1

28 19 10 1

63 43 23 1

-25.4 cm H2O (-10 in H2O) Maximum

500 (Flow is constant)

6.35 (0.25)

3.18 (0.125)

Maximum

30 (100)

20.3 cm H2O (8 in H2O) Maximum

6.35 (0.25)

4.76 (0.188)

2

Note

Honeywell Analytics recommends the use of

Teon FEP (Fluorinated Ethylene Polymer)

tubing to assure proper sample transport.

The properties of Teon FEP make it the

best choice for transporting sample toxic gases to instruments when compared with the properties of other similar tubing materials.

If the pressure/vacuum on the inlet/exhaust lines does not meet the recommended values in Tables 4-1 and 4-2, the following chart describes potential fault conditions that may be brought on by the

external inuences thus resulting in an F81 Flow

Fault.

External Flow Fluctuation Fault 81 Explanation

Low

1

(0-150 cc/min)

Low

2

(0-150 cc/min)

Medium

3

(~200-450 cc/min)

High

4

(> 600 cc/min)

None No Midas® will auto-adjust

Midas® changes the flow

Ye s

(up to 100 cc/min

ﬂow swings)

Yes and No Ye s

gradually. If external flow changes are large and rapid,

Likely

the final reading will be different from what Midas® expected. Midas® will issue Fault 81.

Minimum flow rate for the pump is ~300 cc/min. With this external ﬂow, the auto-adjust cannot work because the pump cannot produce a ﬂow at this low level. The problem is worse if there are ﬂow ﬂuctuations.

Midas® cannot reduce the external flow. Midas® will issue Fault 81 due to high flow

Midas Technical Handbook

4-7

Midas® Gas Detector

4�4 In-line Filters

External filters must be used to protect the tubing from contamination. Use particulate

lter part number 780248 for normal gases and

1830-0055 or 1991-0147 for corrosive gases. Replace the filter every 3 months. Refer to

Appendix B for specic gases.

4�5 Local Detector Option

The Midas® gas detector can also be used to monitor for gas at the location of the detector. To

do this an inline lter is simply connected to the

sensor cartridge gas inlet port. The external dust

lter part number is 780248 for normal gases and

1830-0055 or 1991-0147 for corrosive gases. The area around the detector is then being monitored as opposed to a sample being drawn from a remote location.

Diagram 4-4� Local gas detector option

MDA Scientific Midas

4�6 Electrical Installation

Access for the electrical wires to the terminal module is made via the PG16 cable gland located at the bottom of the mounting bracket assembly. The cable gland can be removed and replaced with a suitable conduit fitting if required. The wire routing of a typical installation is shown in the diagram below, wiring details are shown in Diagram 4-6.

Diagram 4-5� Typical wire routing

4-20mA Analog Output Terminals

Relay Contact Terminals

Relay NO/NC Jumpers

Power Switch

MIDAS-T-001 transmitter installed with in line particulate

lter for local ambient monitoring

mode

Midas Technical Handbook

honeywell

PN: MIDAS-E-CDX SN: 12K-48397 Activate by 24-Nov-12

honeywell

Ethernet Cable

Cable Gland

The terminals used are suitable for conductors of 24 to 14 AWG (0.5 to 1.8mm Dia.). The use of 16 AWG (1.5 mm Dia.) conductors is recommended.

4-8

If Power over Ethernet (PoE) is used to power the device, then 24 VDC power must not also be connected to the device, (or conversely if 24 VDC is used to power the Midas®, then electrical power via the Ethernet port must not be applied). Failure to observe this requirement may cause damage to the gas detection system and will not be covered by the standard warranty.

When connecting the wires ensure that the power switch is in the off position.

Diagram 4-5 shows the terminal module layout

and terminal identication as well as the jumper

locations.

Note: Earthing Requirements

If the Midas® unit’s metal chassis is not connected directly to a metal surface for earthing purposes, an additional earth wire will be required. Connect a wire via the

PG16 gland to the dedicated earth tag (screw

terminal) located on the bottom bracket and connect the other end of the wire to a dedicated external earthing point.

Midas® Gas Detector

If Power over Ethernet (PoE) power supply

is being used, shielded CAT5 Ethernet cable is recommended.

Please ensure that your wiring avoids earth

ground loops that may affect the performance of your equipment

Midas Technical Handbook

4-9

Midas® Gas Detector

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Diagram 4-6� Midas® terminal layout and identication

See Relay

function

table below

Display Description Relay 1 Relay 2 Relay 3

Note

1FLt

2Flt

CmbF

nEtr

Instrument Fault

Only

Separate Fault

Relays

Combined Fault

Relay

Remote control of

relays via Modbus/

TCP or LonWorks

The 3 relays onboard the Midas® unit can be controlled remotely from a separate controller system using

Modbus/TCP commands (or via LonWorks® if the optional interface is used). In this remote mode, the relays

cannot be controlled by the Midas® itself and only by the remote controller device (PLC, SCADA, etc.)

Alarm 1 Alarm 2

Any Alarm

Maintenance

Fault

Alarm 1 Alarm 2 Any Fault

Relays respond to Modbus or

LonWorks® holding registers only.

®

Instrument

Fault

Instrument

Fault

Relays

are user

congurable

Midas Technical Handbook

4-10

Midas® Gas Detector

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

-

24 VDC

+

-

24 VDC

R

Load

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

-

24 VDC

R

Load

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

-

24 VDC

R

Load

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

-

Ethernet

+

-

24 VDC

R

Load

RJ-45 Connector

48 VDC

4�7 Electrical Connections

Midas® can be powered by either 24 VDC via traditional discrete wiring or by approximately 48 VDC delivered through the Ethernet cable from a PoE source. In either case the 4-20 mA analog

output can be used. This can be congured for

fully isolated operation. With 24 VDC power the

4-20 mA output can be congured for sink, source

or isolated output operations.. Below are some schematic diagrams of typical electrical connection

Diagram 4-7� Generic Example

Midas® 4-Wire Isolated Output

configurations. Specific wiring instructions for connecting a Midas to a Honeywell Analytics Sieger System-57TM are provided on pages 4-12 to 4-16.

Specic instructions for connection to a Honeywell

Analytics TouchPointTM are provided on pages 4-17 to 4-20 and the HA71 on pages 4-21 and 4-22.

Note:

When wiring the Midas Transmitter to a

controller, program the controller for a 1-2 second delay before reporting to prevent false alarms.

Diagram 4-9� Generic Example

Midas® 3-Wire Sinking Output

Diagram 4-8� Generic Example

Midas® 3-Wire Sourcing

Midas Technical Handbook

Diagram 4-10� Generic Example

Midas® Isolated 4-20 mA Output w/PoE Power

4-11

Midas® Gas Detector

Diagram 4-11� Midas® to 5701 4-Wire Isolated Connection

J4

+supply

INT EXT

11

10

9

Loop 4-20 mA

Analog Current

EXT INT

-supply J5

PYROLYZER

CONNECTOR

MIDAS

Simplified Internal Schematic

2

+

Internal Power Loads

-

1

INT EXT

4-20 mA

Controlled

Current Source

EXT INT

Sieger System 57 Relay/Field Interface Card

NC

J1

NO

NC

J2

NO

NC

J3

NO

+24 V

COM

Relay1

Relay2

Relay3

8

}

7

6

5

4

3

2

1

Relay1

}

Relay2

}

Relay3

DC

PWR

ON

SW

OFF

Shielded Cable

05701-A-0326 05701-A-0327 05701-A-0328 05701-A-0329 05701-A-0330

Cabinet

29

35

28

36

5701 Card

RJ-45

Sensor Drive Module Link Positions

LK13

LK12

System 57

J4

11

10

J5

9

35

28

29

36

Relay/Field

Interface Card

5701 Control Card

VDC

Sense

Resistor

Isolated Loop

Supply

~40 mA max + 24

Transmitter

Supply

VDC

+ 24

-

LK11

LK10

LK9

LK8

LK7

LK6

LK5

LK4

LK3

LK2

LK1

Midas Technical Handbook

4-12

Midas® Gas Detector

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

Sieger System 57 Relay/Field Interface Card 05701-A-0326 05701-A-0327 05701-A-0328 05701-A-0329 05701-A-0330

System 57

Relay/Field

Interface Card

5701 Control Card

+

24

VDC

-

27

29

28

Sense

Resistor

~170 Ohm

Cabinet

29

2827

Shielded Cable

Transmitter

Supply

5701 Card Sensor Drive Module Link Positions

LK12

LK5

LK6

LK7

LK8

LK9

LK10

LK11

LK1

LK2

LK3

LK4

LK13

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Diagram 4-12� Midas® to 5701 3-Wire Sourcing Connection

Midas Technical Handbook

4-13

Midas® Gas Detector

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

Sieger System 57 Relay/Field Interface Card 05701-A-0326 05701-A-0327 05701-A-0328 05701-A-0329 05701-A-0330

System 57

Relay/Field

Interface Card

5701 Control Card

+

24

VDC

-

27

29

28

Sense

Resistor

~170 ohm

Cabinet

29

28

27

Shielded Cable

Transmitter

Supply

5701 Card Sensor Drive Module Link Positions

LK12

LK5

LK6

LK7

LK8

LK9

LK10

LK11

LK1

LK2

LK3

LK4

LK13

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Diagram 4-13� Midas® to 5701 3-Wire Sinking Connection

Midas Technical Handbook

4-14

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

Sieger System 57 Quad Relay Interface Card 05704-A-0121 with 4 Channel Control Card 05704-A-0145

Cabinet

(01) 17

(S) 15

36

Shielded Cable

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

+

24

VDC

-

+

24

VDC

-

Note:

The above schematic shows the MIDAS connected to channel 1 on the 5704 card. The terminal numbers for all four channels are as follows:

MIDAS Function Loop + Loop Midas Ter minal Number

Color in this figure 5704 Channel 1 Terminal

5704 Channel 4 Terminal

5704 Channel 3 Terminal

5704 Channel 2 Terminal

11

Brown

15

22

21

16

System 57 Function S

10

Blue

17

24

23

18

01

17

15

System 57

Relay/Field

Interface Card

5704 Control Card

+

24

VDC

-

Sense

Resistor

Loop

Supply

Not optically isolated

Diagram 4-14� Midas® to 5704 4-Wire Connection

Midas® Gas Detector

Midas Technical Handbook

4-15

Midas® Gas Detector

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

System 57

Relay/Field

Interface Card

5704 Control Card

19

17

Sense

Resistor

Cabinet

(NS) 19

(01) 17

Shielded Cable

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Sieger System 57 Quad Relay Interface Card 05704-A-0121 with 4 Channel Control Card 05704-A-0145

+

24

VDC

-

+

24

VDC

-

Note:

The above schematic shows the MIDAS connected to channel 1 on the 5704 card. The ter minal numbers for all four channels are as follows:

MIDAS Function Analog Out Common Midas Ter minal Number

Color in this figure 5704 Channel 1 Terminal

5704 Channel 4 Terminal

5704 Channel 3 Terminal

5704 Channel 2 Terminal

10

Blue

17

24

23

18

System 57 Function 01

1

Black

19

26

25

20

NS

Diagram 4-15� Midas® to 5704 3-Wire Sourcing Connection

Midas Technical Handbook

4-16

Shielded

Cable

+

-

24 VDC

Power Supply

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

touchpoint1

Simplified Internal Schematic

1

3

2

+

-

24 VDC

signal

+

-

24 VDC

External Customer-Provided Power Supply

touchpoint 1

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Midas® Gas Detector

Diagram 4-16� Midas® to Touchpoint1 4-Wire Connection

Midas Technical Handbook

4-17

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

touchpoint 1

Shielded Cable

touchpoint1

Simplified Internal Schematic

1

3

2

+

-

24 VDC

signal

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Midas® Gas Detector

Diagram 4-17� Midas® to Touchpoint1 3-Wire Sourcing Connection

Midas Technical Handbook

4-18

touch point4

Shielded

Cable

+

-

24 VDC

Power Supply

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

touchpoint4

Simplified Internal Schematic

1

3

2

+

-

24 VDC

signal

+

-

24 VDC

External Customer-Provided Power Supply

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Midas® Gas Detector

Diagram 4-18� Midas® to Touchpoint4 4-Wire Connection

Midas Technical Handbook

4-19

touchpoint 4

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

touchpoint4

Simplified Internal Schematic

1

3

2

+

-

24 VDC

signal

Shielded Cable

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

Midas® Gas Detector

Diagram 4-19� Midas® to Touchpoint4 3-Wire Sourcing Connection

Midas Technical Handbook

4-20

4-20 mA

Controlled

Current Source

Internal

Power

Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

Shielded Cable

EXC

LO

HI

+

-

24 VDC

signal

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

HA71

Analog Input Card

R2

R1

ANALOG INPUTS

R3

R4

R7

R6

R5

+EXC-

DC PWR

TB2

R8

JP1

ST-71 ANALOG INPUT BOARD

0010-1115 ASSY# 10-0158

J2

J1

CH1/9

EXC HI

CH7/15

HIEXC

CH3/11

EXC LOHILO

CH5/13

LOHI EXC LO

CH2/10

HIEXC

CH8/16CH4/12

EXC LOHI CXEOL

CH6/14

EXC LO OLIH HI

3 Wire 4-20mA

Transmitter

EXC LOHI

+Pwr

Sig

Com

Midas® Gas Detector

Diagram 4-20� Midas® to HA71 3-Wire Sourcing Connection

Midas Technical Handbook

4-21

4-20 mA

Controlled

Current Source

Internal

Power Loads

J4

INT EXT

J5

EXT INT

11

10

9

MIDAS

Simplified Internal Schematic

2

1

-

+

Cabinet

Shielded Cable

RJ-45

8

7

2

3

4

5

6

1

DC

PWR

+24 V

COM

NO

NC

Relay3

Relay2

Relay1

ON

SW

OFF

11

10

9

Analog Current

Loop 4-20 mA

INT EXT

EXT INT

-supply J5

J4

+supply

J1

NO

NC

J2

NO

NC

J3

PYROLYZER

CONNECTOR

Relay1

}

Relay2

}

Relay3

}

+

24

VDC

-

HI

EXC

+

24

VDC

-

Sense

Resistor

Loop

Supply

Not optically isolated

HA71

Analog Input Card

R2

R1

ANALOG INPUTS

R3

R4

R7

R6

R5

+EXC-

DC PWR

TB2

R8

JP1

ST-71 ANALOG INPUT BOARD

0010-1115 ASSY# 10-0158

J2

J1

CH1/9

EXC HI

CH7/15

HIEXC

CH3/11

EXC LOHILO

CH5/13

LOHI EXC LO

CH2/10

HIEXC

CH8/16CH4/12

EXC LOHI CXEOL

CH6/14

EXC LO OLIH HI

EXC LOHI

4 Wire 4-20mA

Transmitter

+Pwr

Sig

+

-

24 VDC

Power Supply

Midas® Gas Detector

Diagram 4-21� Midas® to HA71 4-Wire Connection

Midas Technical Handbook

4-22

Midas® Gas Detector

4.8 Retting the Main Chassis

The main chassis can be refitted to the mounting bracket assembly using the following steps.

1. Align the PCB at the top rear of the main chassis with the connector located at the top of the mounting bracket assembly

2. At the same time align the two tubes at the bottom rear of the main chassis with the two tubes located on the bottom of the mounting bracket assembly.

3. Slide the chassis backwards on the mounting bracket assembly so that the PCB and connector and tubes engage simultaneously. (See diagram below).

4. Ensure the PCB, connector and tubes are fully engaged by firmly pushing the main chassis horizontally backward on the mounting bracket assembly (WARNING: DO NOT PUSH ON THE LCD AS THIS MAY CAUSE DAMAGE).

5. Align the two attaching screws located at the bottom of the chassis with the screw threads on the mounting bracket assembly.

6. Tighten the screws to secure the chassis to the mounting bracket assembly.

Diagram 4-22. Retting the chassis.

CONNECTOR

Midas Technical Handbook

PCB

TUBES

4�9 Installing the Sensor Cartridge

The Midas® sensor cartridge is supplied separately and needs to be tted to the detector’s main chassis. The following steps and diagrams detail the procedure for installing the sensor cartridge for the rst time. This procedure is carried out with the power off and the detector cover removed.

1. Verify the part number and type of sensor cartridge is correct for your application, then remove sensor cartridge from its packaging.

Sensor Cartridge ID Number

Gas ID Number

2. Remove cap from cartridge and bias battery (if applicable).

3. Add label for secondary gases (if necessary).

4. Align pins at the top of the sensor cartridge with the socket in the sensor cartridge chamber.

5. Carefully push the sensor cartridge into the sensor cartridge chamber until fully seated.

6. Lock the sensor cartridge in place using the tabs on either side of the sensor cartridge to secure the cartridge to the main chassis.

7. Switch the power switch on the terminal module to the ‘on’ position.

8. Reattach the detector cover by aligning the slots on either side with the locating tabs on the mounting bracket assembly.

9. Push the cover horizontally until fully seated.

10. Tighten the thumbscrew on the front panel.

4-23

Diagram 4-23� Installing the sensor cartridge

?????

??????????????? ?????

????????????????????

???

????????????????

???????????????

???????????????????

chassis

midas

Gas

Sen

sor

C

ar tr

idg

e

NITROGE

N T

RIFLUORIDE

NF3

PN

: MIDAS-S-H

SN :

FX

0

23445667

Use by : 07-09-

0

ze

2006

llweger analytics

cartridge

How cover is fitted

tighten

Midas® Gas Detector

slots

cartridge fitted

tabs

Caution

When retting the cover to the Midas® unit,

use caution to prevent damage to the RFI shielding tabs attached to the chassis�

Midas Technical Handbook

4-24

Midas® Gas Detector

5 Detector Start-Up

Procedures

Midas Technical Handbook

5-1

Midas® Gas Detector

5 Detector Start Up Procedures

WARNING

Prior to carrying out any work ensure local and site procedures are followed� Ensure that the associated control panel is inhibited so as to prevent false alarms�

The following procedure should be followed carefully and only performed by suitably trained personnel.

1. Ensure the detector is wired correctly according to Sections 4.6 and 4.7.

2. Ensure that the correct sensor cartridge is ﬁtted. (If the cartridge has not been stored at room temperature, allow one hour for equilibration.)

3. Ensure the on/off switch on the mounting bracket assembly is in the on position.

4. Apply power to the system.

5. After the start up routine the detector will display normal operating mode as shown in

Section 6.

6. Perform a leak test as shown in Section 8.5 to ensure all connections are secure.

6. If using a multi gas sensor cartridge refer to

Section 7.2.2 to ensure the correct gas ID

code is selected.

7. Allow the detector to stabilize until the ‘WArm’ message is no longer displayed. The maximum warm up time is listed in Appendix B. Warm-up times are typically much faster.

8. If this is a ﬁrst-time start up, an F49 or F88 fault code may be displayed; there is no actual fault and the fault message can be cleared by depressing the ‘X’ cancel button

for 2 seconds.

To properly activate the Midas® with a cartridge for the ﬁrst time:

• When ‘Change Gas’ scrolls on the display, hit the ‘3’ on the Midas® front panel.

• When the ‘reboot’ completes then press and hold the ‘X’ to clear any latched fault(s).

• If “FIrSt CEll” is displayed, press ‘3’.

The cartridge has now been accepted by the Midas® as the correct type to be used.

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Midas® Gas Detector

6 General Operation

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6-1

6 General Operation

After applying power to the detector, the display will go through a start up test routine illuminating in sequence all the LEDs, icons and digits of the display. The display will show the message ‘WAIt’ and ‘LoAd’ as it checks for cartridge data, typically less than 180 seconds. It will then display the message ‘WArm’ until the sensor cartridge reaches operating temperature. When complete, the detector will enter normal monitoring mode indicated by the ‘ ’ icon on the display cycling through three states (2 rings, 3 rings, 4 rings). The measured gas concentration will be shown on the display. The green LED will ﬂash once every second indicating power and the sample ﬂow rate indicator will be displayed. If monitoring is interrupted due to a fault, a test or calibration process or a user requested inhibit, the display will ﬂash. For details of fault and

maintenance fault codes refer to Section 11.

Note

The rst time the Midas® is started with a new sensor cartridge, an F49 or F88 fault

code may be displayed; there is no actual fault and the fault message can be cleared by depressing the ‘X’ cancel button for two seconds.

Midas® Gas Detector

Normal Operation

6�1 Normal Operation Mode

In this mode the detector displays gas concentration, alarm, fault and status information via its backlit LCD and front panel LEDs. Typical normal operation display and output states are shown below. See Section 11 for a full list of fault codes.

Note:

The examples in Table 6-1 are for a linear 4-20 mA output over a full scale range of 2 ppm. The current output for a given gas concentration will be different for other full scale ranges (linear 4 mA = 0 % full scale to 20 mA = 100 % full scale). The alarm and fault relays are in default (latching) mode.

Final Start Up Routine Screen

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Table 6-1� Normal operation display and output states�

Operational

State

Alarm 2 Alarm relay 1 activated

Greater than full scale

Relay status

(common case)

Alarm relay 2 activated

Fault relay activated

Alarm relay 1 activated Alarm relay 2 activated

Fault relay activated

4-20 mA output

(for 2ppm range)

8 mA

(proportionate to

concentration)

21 mA

LEDs

Green flash

Red flash

Green flash

Red flash

Midas® Gas Detector

Backlight

Classic Mode Multi Color Mode

Red flash

Green

White flash

Green

Yellow flash

Display

Inhibit

Low flow rate

Low flow fault

Alarm relay 1 de-activated Alarm relay 2 de-activated

Fault relay activated

Alarm relay 1 de-activated Alarm relay 2 de-activated

Fault relay activated

Alarm relay 1 de-activated Alarm relay 2 de-activated

Fault relay de-activated

2 mA Green flash Green Green

Green flash

3 mA

Yellow on

Green flash

1 mA

Yellow flash

Green Yellow

White flash

Green

Yellow flash

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Midas® Gas Detector

6�1�1 Resetting Alarms, and Faults

The alarm function of Midas® can be set to latching (See Set-up Mode) so that when an alarm occurs the associated outputs remain activated even if the gas reading has dropped below the alarm level. To reset the latched alarm press the ‘X’ cancel button for 2 seconds. If the gas level is still above the alarm point you can reset the associated relay but it will activate again after the elapse of any alarm on delay that has been set.

If the alarm function is set to non-latching, the display will automatically clear when the alarm condition is cleared.

The fault function can also be set to latching. It can be reset by pressing the ‘X’ cancel button for 2 seconds. If the fault conditions persist, the fault will be reappear quickly.

If the fault operation is set to non-latching, the display will automatically clear when the fault condition is cleared.

scroll through to view the settings. The ‘X’ cancel button can be used to exit the submenu and allow selection of a different submenu, or can be pressed again to exit to normal operating mode. When in review mode the unit will automatically return to the main normal operation status display if either an alarm level is exceeded or no button is pressed for 60 seconds.

Table 6-2 shows an overview of the different review

menus and how they are navigated. For a detailed step-by-step instruction of how to review the detector setting in review mode refer to Section 7.1.

6�2 Review Mode

The detector settings can be reviewed safely without the possibility to make changes by using review mode. To select review mode press the ‘s’ up or ‘t’ down button once. The review mode icon ‘ ’ will show on the display and the ﬁrst review mode menu icon is displayed.

6�2�1 Review Mode Menu Overview

The menu is simply navigated by using the ‘s’ up and ‘t’ down buttons to select the required menu, and then using the ‘3’ accept button to enter that submenu and

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6-4

Table 6-2� Review menu overview�

Midas® Gas Detector

Display Screen 1 Screen 2 Screen 3 Screen 4 Screen 5 Screen 6 Screen 7 Screen 8

Software

SW

Alarms

ALm

Faults

FLt

Calibration

CAL

Date/Time

tImE

Address

nEt

Event Log

hiSt

LCD

Transmitter software revision

Gas Selection

Fault relay conﬁguration

Days to calibration due

Year Month -

Shows web access level

Date of latest event

Shows LCD Backlight Mode

Checksum Password

Alarm 1 direction: U: rising d: falling

Faults latching/ nonlatching

Days to cartridge expire

Day

Use DHCP server for IP parameters

Time of latest event

key 1

Alarm 1 threshold

Fault relays normally energized/ deenergized

Year of last calibration

Time

IP address byte 1

Description of latest event

Password key 2

Alarm 2 direction: U: rising d: falling

Fault m12 occurrence frequency

Month and day of last calibration

IP address byte 2

Date of second latest event

Alarm 2 threshold

IP address byte 3

Time of second event

Alarm delay time

IP address byte 4

Description of second event

Alarm latching

Subnet mask byte 1

Repeat for events 3-7, 3 Displays per event

Alarm relays normally energized/ deenergized

Subnet mask byte 2

Screen 9Screen

Subnet mask byte 3

10

Subnet mask byte 4

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Midas® Gas Detector

6�3 Overview of Set-up, Calibration and Test Mode

WARNING

Set-up, calibration and test modes are intended for use by trained personnel or service engineers only� Access to these modes can be pass code protected by following the procedure in Section 7.2.7�

Set-up, calibration and test modes are used to make setting changes, calibrate and test the detector. To select set-up, calibration and test mode press and hold the ‘s’ up button or ‘t’ down button for one second. The unit will automatically go to the main normal operation status display from setup/calibration/test menus (but not from inside a setup/calibration/test function) if no button is pressed for 5 minutes or if an alarm level is exceeded.

PASS CODE: If a pass code has been set the display will show 0000 with the ﬁrst 0 ﬂashing. Use the ‘s’ up or ‘t’ down buttons to set the ﬁrst digit of the pass code. Press ‘3’ to enter the ﬁrst digit. The second digit will then ﬂash. Repeat the process until all four pass code digits have been entered. Please record your pass code in a separate archive that can be securely retrieved. Failure to be able to retrieve your pass code may lead to delays in gaining access to all the protected functions in each Midas® unit. If an incorrect code is entered the display will show ‘Err’ and return to the normal operation mode. If a pass code is forgotten contact your local Honeywell Analytics service department.

After successfully entering the pass code (if set) the

ﬁrst menu ‘ SET’ set-up icon will show on the display.

The ‘ CAL’ calibration or ‘ tESt’ test menu can also be selected using the ‘s’ up or ‘t’ down buttons. Press the ‘3’ accept button to enter the selected menu or the ‘X’ cancel button to return to normal operation mode.

6�3�1 Set-up Menu Overview

The set-up menu allows changes to be made to the detector alarm, fault, calibration interval, date/time and digital address settings. The menu is navigated using the ‘s’ up and ‘t’ down buttons to select the required submenu and then using ‘3’ accept button to enter that submenu. The ‘s’ up and ‘t’ down buttons are used to make changes to the selected setting and are conﬁrmed using the ‘3’ accept button. The ‘X’ cancel button can be used to exit the submenu and allow selection of a different submenu, or can be pressed again to exit to the main set-up, calibration and test menu. Pressing the ‘X’ cancel button again returns the detector to normal operating mode.

Note

All settings in a submenu are accepted when the ‘3’ accept button is pressed after the last submenu setting. This saves the changes

and is indicated by displaying ‘UPdt’ on the LCD. If however the ‘X’ cancel button is

pressed at any time before the changes are accepted, this will cause any changes to be cancelled in that particular submenu.

Table 6-3 shows an overview of the set-up submenus

and how they are navigated. For a detailed step-by-step instruction of how to change the detector settings using the set-up menu refer to Section 7.2.

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Midas® Gas Detector

Table 6-3. Set-up menu overview.

Display Screen 1 Screen 2 Screen 3 Screen 4Screen 5Screen 6Screen 7Screen 8Screen 9Screen 10

Alarms

ALm

Change gas ID for multi-gas sensors

Set alarm 1 direction: U: rising d: falling

Set alarm 1 threshold

Set alarm 2 direction: U: rising d: falling

Set alarm 2 threshold

Set alarm delay time

Set alarm latching

Set alarm relays normally energized/ deenergized

Faults

FLt

Set fault

(1FLt, 2FLt, CmbF or nEtr)

Set fault latching/ nonlatching

Set fault relays normally energized/ deenergized

Set fault m12 occurrence freq: 1m12:once Wm12: wkly 0m12: never

Calibration

CAL

Set calibration interval (MIDAS-S 0-365 days, MIDAS-E 0-730 days 0 = off)*

Date/Time

tImE

Set date format: dd:mm or mm:dd

Set year: yyyy (2003-

2030)

Set month: mm (01-12)

Set Day: dd (01-31)

Set hour: hh (00-23)

Set minute: mm (00-59)

Address

nEt

Set Web Access: WA Y: full access WA n: read only

Set Auto or Manual address: AU Y: DHCP AU n: man

Manual IP address byte 1

Manual IP address byte 2

Manual IP address byte 3

Manual IP address byte 4

Manual Subnet mask byte 1

Manual Subnet mask byte 2

Manual Subnet mask byte 3

Manual Subnet mask byte 4

Set Pass

Code

PWd

Press or

to set pass code digit 1

Press or

to set pass code digit 2

Press or

to set pass code digit 3

Press or

to set pass code digit 4

Press or

to

pass code digit 1

Press or

to

pass code digit 2

Press or

to

pass code digit 3

Press

or

pass code digit 4

* MIDAS-E-LEL 0-1825 days

LCD

Set backlight mode bm: C(classic mode) or bm: m (multi color mode)

PUMP

Set pump control frequency

Table 6-3� Set-up menu overview�

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Midas® Gas Detector

6�3�2 Calibration Menu Overview ‘ CAL’

The calibration menu allows calibration of the detector zero, span, ﬂow and 4-20 mA. The menu is simply navigated using the ‘s’ up and ‘t’ down buttons to select the required submenu and then using ‘3’ accept button to enter that submenu. The ‘s’ up and ‘t’ down buttons are used to make any changes to a selected setting and are conﬁrmed using the ‘3’ accept button. The ‘X’ cancel button can be used to exit the submenu and allow selection of a different submenu, or can be pressed again to exit to the main set-up, calibration and test menu. Pressing the ‘X’ cancel button again returns the detector to normal operating mode.

The table below shows an overview of the calibration submenus and how they are navigated. For a detailed step-by-step instruction of how to change the detector calibration settings refer to Section 7.2.

Table 6-4� Calibration menu overview�

Display Screen 1 Screen 2 Screen 3 Screen 4

Zero

0CAL

Span

SPAn

Flow

FLoW

4-20

mA

4-20

mA

Icon flashes alerting user to prepare to apply zero gas

Set gas ID code of calibration for multi-gas sensors only

Icon flashes, display shows 0 indicating flow zero will be set.

4 mA is

displayed

indicating

analog output

should be

4 mA

Unit is zeroing PASS is

displayed if OK, fault code displayed if not.

Select if humidiﬁed: HUm or dry: drY calibration gas

Unit counts down from

10 to 0 and sets flow zero. Display shows

1st set point

target flow rate.

Use s or t to

make reading

on external

flow meter +/-

50cc/min of set

point 1

Adjust until

analog output is

4 mA

Verify output

with meter

Adjust value to display span gas concentration used

Use s or

t to change

the flashing

display to the

actual reading

from the

external flow

meter

20 mA is displayed indicating

analog output

should be

20 mA

Display steadies and displays span gas reading, dots indicate progress.

PASS is displayed if OK, fault code displays if not.

Unit counts

down from 10

to 0 and sets 1st set point.

Icon flashes

and displays 2nd set point target. Repeat

process to

set.

Adjust until

analog output

is

20 mA

Verify output

with meter

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Midas® Gas Detector

6�3�3 Test Menu Overview ‘ tESt’

The test menu is used to test the detector gas reading using bump test gas, and for simulation of alarm and fault display and output operation. The test menu also contains the detector Inhibit facility. Use the ‘s’ up and ‘t’ down buttons to select either bump test or alarm/fault test. Press the ‘3’ accept button to enter that submenu.

The table below shows an overview of the test submenus and how they are navigated. For a detailed step-by-step instruction of how to test the detector operation refer to Section 7.2.

Note

In bump test mode, the Modbus/TCP

outputs are not inhibited. Only the 4-20mA and alarm outputs are inhibited.

The bump gas test is a functional check only. Consult local guidelines for recommended best practices. Bump test concentrations recommended in Appendix B are calculated to generate a minimum first alarm level response.

Table 6-5� Test Submenu

Display Screen 1 Screen 2 Screen 3 Screen 4

Press ‘X’ to

exit to test

menu

Display

shows

‘SuRE’.

Set inhibit

timeout

period

Display

flashes ‘SIm’

and simulates

the selected

A1, A2 or

Fault display

and output.

UPdt is

displayed and

unit enters

selected

inhibit state.

Display returns to submenu

Press ‘X’

to exit and

select another

simulation or

‘X’ again to

return to test

submenu

Bump bUmP

Alarm/fault

SIm

Inhibit

Inh

4-20 mA

4-20

mA

Apply bump

test gas and display shows measured gas

concentration with all alarm

outputs

inhibited

Display shows

‘Sim’ and

the A1 ‘s’

symbol.

4 states:

s: alm 1

: alm 2

flashing: inst flt

: maint flt

Press s or t to select ALm,

ALm-Ft, ALL

or nonE inhibit

state

Display shows

‘S XX’ where XX is the mA

value

Press s or t for the desired

mA output

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6-9

Midas® Gas Detector

7 Detailed Procedures for

Navigating Mode Submenus

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7-1

Midas® Gas Detector

7 Detailed Procedures for Navigating Mode Submenus

The following sections provide step-by-step procedures for navigating all the modes and submenus.

7�1 Review Mode

Review mode allows the settings of the detector to be reviewed safely without any changes being made. Review mode consists of 7 submenus as shown in the table below:

Table 7-1� Review mode submenus�

Review

submenu

Software

Alarms

Faults

Calibration

Time/Date

IP address

Event log

To select review mode from normal operation, press the ‘s’ up or ‘t’ down button once. The icon will be displayed along with the ﬁrst submenu icon. Press the ‘s’ up or ‘t’ down buttons to select a different submenu icon.

Icon Settings Displayed

SW Revision and checksum

Sensor cartridge and gas ID codes, alarm 1 and alarm 2 configuration and set points, time delay, latching/non latching, energized/de-energized

Configuration, Latching/non latching, energized/de-energized

Days left to next calibration due and date of last calibration

tImE Current year, date and time

Auto address selection on/off, IP address, sub net mask values.

View the date, time and details of the last seven alarm, fault and maintenance fault events

7�1�1 Review Software ‘SW’

1. Select the software ‘SW’ submenu and press ‘3’ to accept.

2. The software version number is displayed.

3. Press ‘3’ to display the software checksum

4. Press ‘3’ to display the password key 1.

5. Press ‘3’ to display the password key 2.

6. Press ‘3’ to return to step 1.

7. Repeat steps 1 through 4 to view the information again or press ‘s’ up or ‘t’ down to select another submenu.

8. Press ‘X’ to return to normal operation

7�1�2 Review Alarms ‘ ALm’

1. Select the alarms ‘ Alm’ submenu and press ‘3’ to accept.

2. The sensor cartridge ID (X) and the set gas ID code (Y) are displayed in the format (X – Y). (See Appendix B for a list of sensor cartridge and gas ID codes).

3. Press ‘3’ to display if the level 1 alarm (L1) type is rising (U) or falling (d).

4. Press ‘3’ to display the alarm 1 value along with the A1 icon‘s’.

5. Press ‘3’ to display if the level 2 alarm (L2) type is rising (U) or falling (d).

6. Press ‘3’ to display the alarm 2 value along with the A2 icon ‘ ’.

7. Press ‘3’ to display the alarm on delay (seconds).

8. Press ‘3’ to display if the alarm output is set to latching (L) or non latching (nL).

9. Press ‘3’ to display if the alarm relays are set

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Midas® Gas Detector

to normally energized (nE) or normally deenergized (nd).

10. Press ‘3’ to return to step 1.

11. Repeat steps 1 through 7 to view the settings again or press ‘s’ up or ‘t’ down to select another submenu.

12. Press ‘X’ to return to normal operation.

7�1�3 Review Faults ‘ FLt’

1. Select the faults ‘ FLt’ submenu and press ‘3’ to accept.

2. The fault relay configuration (1FLt, 2 FLt, CmbF, or nEtr) is displayed. (See Section 7.2.3 for details of fault relay conﬁgurations).

3. The fault output latching (L) or non latching (nL) setting is displayed.

4. Press ‘3’ to display the fault relay normally energized (nE) or normally de-energized (nd) setting.

5. Press ‘3’ to return to step 1.

6. Repeat steps 1 through 4 to view the settings again or press ‘s’ up or ‘t’ down to select another submenu.

7. Press ‘X’ to return to normal operation.

7�1�4 Review Calibration ‘ CAL’

1. Select the review calibration ‘ CAL’ submenu and press ‘3’ to accept.

2. The number of days remaining to the next calibration due date is displayed. If the number of days is set to zero then no further reminders will be displayed.

3. Press ‘3’ to display the number of days until cartridge expiration.

4. Press ‘3’ to display the year and press ‘3’

again to display the month and day of the last calibration.

5. Press ‘3’ to return to step 1.

6. Repeat steps 1 through 4 to view the settings again or press ‘s’ up or ‘t’ down to select another submenu.

7. Press ‘X’ to return to normal operation.

7�1�5 Review Date and Time ‘timE’

1. Select the review date and time ‘timE’ submenu and press ‘3’ to accept.

2. The current year setting is displayed.

3. Press ‘3’ to display the current month and day

4. Press ‘3’ again to display the current time.

5. Press ‘3’ to return to step 1.

6. Repeat steps 1 through 5 to view the settings again or press ‘s’ up or ‘t’ down to select another submenu.

7. Press ‘X’ to return to normal operation.

7�1�6 Review Detector Address ‘ nEt’

1. Select the review address ‘ nEt’ submenu and press ‘3’ to accept.

2. ‘WA Y’ or ‘WA n’ is displayed depending on whether full web access or read only has been selected.

3. ‘AU Y’ or ‘AU n’ is displayed depending on if auto address detection is on (AU Y) or off (AU n).

4. Press ‘3’ to display the ﬁrst part of the IP address preceded by the letter ‘A’.

5. The dot on the upper left indicates that the ﬁrst part of the IP address is being displayed.

6. Press ‘3’ to display the second part of the

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7-3

address. The two dots on the upper left indicate the 2nd portion of the address.

7. Press ‘3’ again to display the third part and again to display the last part of the address.

8. Press ‘3’ and the ﬁrst part of the sub net mask values will be displayed preceded by the letter ‘n’.

9. Press ‘3’ to scroll through the second, third and forth sub net values. The number of dots in the upper left indicate which part of the sub net address is being viewed.

10. Press ‘3’ to return to step 1.

11. Repeat steps 1 through 9 to view the settings again or press ‘s’ up or ‘t’ down to select another submenu.

12. Press ‘X’ to return to normal operation.

7�1�7 Review Event Log ‘ Hi St’

1. Select the review event log ‘ Hi St’ submenu.

2. The number of logged data events available is indicated by the number of dots (0-7) shown on the left of the display.

3. Press ‘3’ to view the date of the last recorded event.

4. Press ‘3’ to display the time of the event.

5. Press ‘3’ again to display the relevant alarm icon and event code.

6. Repeat to view next logged event details.

7. Press ‘X’ to return to normal operation.

Note

More detailed event log information can be viewed using the web browser feature. Refer to Section 13 for further details

Midas® Gas Detector

7�1�8 Review LCD Backlight Mode ‘LCD’

1. Select the review ‘LCD’ submenu and press ‘3’ to accept.

2. The LCD Backlight mode setting is displayed.

3. Press ‘X’ to return to normal operation.

7�2 Set-up, Calibration and Test Modes

WARNING

Set-up, calibration and test modes are intended for use by trained personnel or service engineers only� Access to these modes can be pass code protected by following the procedure in Section 7.2.7�

Set-up, calibration and test modes are used to make setting changes, calibrate and test the detector. To select set-up, calibration or test mode press and hold the ‘s’ up button or ‘t’ down button for a second to enter the menu. The unit will automatically go to the main normal operation status display from setup/ calibration/test menus (but not from inside a setup/ calibration/test function) if no button is pressed for 5 minutes or if an alarm level is exceeded.

PASS CODE: If a pass code has been set the display will show 0000 with the ﬁrst 0 ﬂashing. Use the ‘s’ up or ‘t’ down buttons to set the ﬁrst digit of the pass code. Press ‘3’ to enter the ﬁrst digit. The second digit will then ﬂash. Repeat the process until all four pass code digits have been entered. If an incorrect code is entered the display will show ‘Err’ and return to the normal operation mode. If a pass code is forgotten contact your local Honeywell Analytics service department.

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7-4

Note

Should the passcode be activated, the unit will continue to detect gas and indicate maintenance and instrument faults.

After successfully entering the pass code (if set) the ﬁrst menu ‘ SET’ set-up icon will show on the display. The ‘ CAL’ calibration or ‘ tESt’ test menu can also be selected using the ‘s’ up or ‘t’ down buttons. Press the ‘3’ accept button to enter the selected menu or the ‘X’ cancel button to return to normal operation mode.

Midas® Gas Detector

submenu setting. This saves the changes and

is indicated by displaying ‘UPdt’ on the LCD. If however the ‘X’ cancel button is pressed at

any time before the changes are accepted, this will cause any changes to be cancelled in that particular submenu.

To select the set-up menu from normal operation, press the ‘s’ up button for a few seconds. Enter the pass code (if set). Use the ‘s’ up or ‘t’ down buttons to select the set-up menu ‘ ’ icon and press the ‘3’ accept button.

7�2�2 Set Alarms ‘ ALm’

7�2�1 Set-up Menu ‘ SEt’

The set-up menu allows the settings of the detector to be changed. The set-up menu consists of 6 submenus as shown in the table below.

Table 7-2� Set-up mode submenus�

Set-up

submenu

Alarms

Faults

Calibration Calibration interval (days)

Time/Date tImE

IP address

Pass code Set pass code

Note

Icon Changeable settings

Gas ID, alarm 1 and alarm 2 conﬁguration, set

points, time delay, latching/non latching, energized/

de-energized

Conﬁguration, latching/non latching, energized/

de-energized

Date format mm:dd or dd:mm, current year, month,

day, hours, minutes

Auto address selection on/off, IP address, subnet

mask values.

All settings in a submenu are accepted when the ‘3’ accept button is pressed after the last

1. Use the ‘s’ up or ‘t’ down buttons to select the set alarms ‘ ALm’ submenu and press ‘3’ to accept.

2. The ﬂashing gas id code is displayed along with the gas cylinder and alarms icon ‘ ’.

3. Use the ‘s’ up or ‘t’ down buttons to change the gas ID number (only applicable on multi gas sensor cartridges- See Appendix B).

4. Press ‘3’ to accept.

5. The ﬂashing level 1 (L1) alarm type is displayed (U) rising or (d) falling.

6. Use the ‘s’ up or ‘t’ down buttons to change the alarm type.

7. The ﬂashing alarm 1 value is displayed along with the icon ‘s’.

8. Use the ‘s’ up or ‘t’ down buttons to change the value.

9. Press ‘3’ to accept.

10. The ﬂashing level 2 (L2) alarm type is displayed (U) rising or (d) falling.

11. Use the ‘s’ up or ‘t’ down buttons to change the alarm type.

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Midas® Gas Detector

12. Press ‘3’ to display the ﬂashing alarm 2 value along with the icon ‘ ’.

13. Use the ‘s’ up or ‘t’ down buttons to change the A2 value.

14. Press ‘3’ to display the ﬂashing alarm on time delay (seconds).

15. Use the ‘s’ up or ‘t’ down buttons to change the alarm on time delay (seconds).

16. Press ‘3’ to display the ﬂashing alarm output latching (L) or non latching (nL) setting.

17. Use the ‘s’ up or ‘t’ down buttons to change between the settings.

18. Press ‘3’ to display the ﬂashing alarm relays normally energized (nE) or normally deenergized (nd) setting.

19. Use the ‘s’ up or ‘t’ down buttons to change between the settings.

20. Press ‘3’ to update all the changes (UPdt displayed) and return to step 1.

21. Press ‘s’ up or ‘t’ down to select another submenu.

22. Press ‘X’ to return to set-up, calibration and test menu selection.

23. Press ‘X’ again to return to normal operation.

Note

When replacing a single gas sensor cartridge

with the same type single gas sensor cartridge,

no change of gas conrmation is required. When changing a multi gas sensor cartridge

with the same type multi gas sensor cartridge, the new sensor cartridge will assume the same previously set gas ID and will

not request a change gas conrmation. See

Appendix B for cartridge information.

7�2�3 Set Faults ‘ FLt’

1. Use the ‘s’ up or ‘t’ down buttons to select the set faults ‘ FLt’ submenu and press ‘3’ to accept.

2. The ﬂashing fault relay conﬁguration (1FLt, 2 FLt, CmbF or nEtr) is displayed.

3. Use the ‘s’ up or ‘t’ down buttons to change the conﬁguration. (See Table 7-3 for details of fault relay conﬁgurations)

4. Press ‘3’ to display the ﬂashing fault output latching (L) or non latching (nL) setting is displayed.

5. Use the ‘s’ up or ‘t’ down buttons to change between the settings.

6. Press ‘3’ to display the ﬂashing fault output normally energized (nE) or normally deenergized (nd) setting.

7. Use the ‘s’ up or ‘t’ down buttons to change between the settings.

8. Press ‘3’ to set the fault m12 frequency.

9. Use the ‘s’ up and ‘t’ down buttons to change between settings:

LCD Display m12 Frequency

Wm 12 car tridge expiration weekly reminder

0m 12 no reminder

1m12 one-time reminder

10. Press ‘3’ to update all the changes (UPdt displayed) and return to step 1.

11. Press ‘s’ up or ‘t’ down to select another submenu.

12. Press ‘X’ to return to set-up, calibration and test menu selection.

13. Press ‘X’ again to return to normal operation.

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7-6

Table 7-3. Fault relay conguration options.

Fault Relay Configuration

Instrument Fault Only (1FLt)

Separate Fault Relays (2FLt)

Combined Fault Relay (CmbF)

Network Remote Control (nEtr)

Relay 1 Relay 2 Relay 3

Alarm 1 Alarm 2 Instrument

Fault

Any Alarm

Alarm 1 Alarm 2 Any Fault

Remote control of relays via Modbus/

Maintenance Fault

TCP or LonWorks

Instrument Fault

®

Note

Remote control of the relays can be facilitated

using Modbus/TCP or LonWorks® control

from a centralized control system. In this mode, the Midas® relays are only controlled via the remote system when set to nEtr.

7�2�4 Set Calibration Interval ‘ CAL’

1. Select the set calibration interval ‘ CAL’ submenu and press ‘3’ to accept.

2. The ﬂashing display shows the number of days interval after a calibration that a calibration due maintenance fault will be displayed.

3. Use the ‘s’ up or ‘t ’ down buttons to change the number of days. (If the calibration interval is set below ‘001’ then ‘OFF’ will be displayed and no user calibration interval will be activated and no reminders displayed)

4. Press ‘3’ to update the change (UPdt displayed) and return to step 1.

5. Press ‘s’ up or ‘t’ down to select another

Midas® Gas Detector

submenu.

6. Press ‘X’ to return to set-up, calibration and test menu selection.

7. Press ‘X’ again to return to normal operation.

7�2�5 Set Date and Time ‘timE’

1. Select the set date and time ‘timE’ submenu and press ‘3’ to accept.

2. The ﬂashing display will show the current date format mm:dd or dd:mm.

3. Use the ‘s’ up or ‘t’ down buttons to change the date format.

4. Press ‘3’ to display the ﬂashing current year setting.

5. Use the ‘s’ up or ‘t’ down buttons to change the year setting (between 2003 and 2030).

6. Press ‘3’ to display the ﬂashing current month setting.

7. Use the ‘s’ up or ‘t’ down buttons to change the month setting (between 1 and 12)

8. Press ‘3’ to display the ﬂashing current day setting.

9. Use the ‘s’ up or ‘t’ down buttons to change the day setting (between 1 and 31)

10. Press ‘3’ to display the ﬂashing hours of current time.

11. Use the ‘s’ up or ‘t’ down buttons to change the hours setting (between 00 and 23).

12. Press ‘3’ to display the ﬂashing minutes of current time.

13. Use the ‘s’ up or ‘t’ down buttons to change the minutes setting (between 00 and 59).

14. Press ‘3’ to update the changes (UPdt displayed) and return to step 1.

15. Press ‘s’ up or ‘t’ down to select another

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7-7

Midas® Gas Detector

submenu.

16. Press ‘X’ to return to set-up, calibration and test menu selection.

17. Press ‘X’ again to return to normal operation.

7�2�6 Set Address ‘ nEt’

Note

Default IP address is 169.254.60.47; subnet mask 255.255.255.0 (when using the LonWorks Interface Module, the default IP address must

be used).

1. Select the set address ‘ nEt’ submenu and press ‘3’ to accept.

2. Press ‘s’ up or ‘t’ down to select full web access (WA Y) or read only (WA n) and press ‘3’ to accept.

3. A ﬂashing ‘n’ or ‘Y’ is displayed depending on if auto address detection is on (AU Y) or off (AU n).

4. If automatic address detection (AU Y) is selected then the detector will automatically appoint a valid IP address when it reboots. The Midas® will display “UPdt” and request a reboot after this setting is accepted.

5. If manual address setting (AU n) is selected press ‘3’ to display the ﬂashing ﬁrst part of the IP address. The dot on the upper left indicates that the ﬁrst part of the IP address is being displayed.

6. Use the ‘s’ up or ‘t’ down buttons to change the address setting (between 0 and 255)

7. Press ‘3’ to display the second part of the address. The two dots on the upper left indicate the 2nd portion of the address.

8. Use the ‘s’ up or ‘t’ down buttons to change the address setting (between 0 and 255).

9. Repeat for the third and fourth parts of the IP address.

10. Press ‘3’ to display the ﬂashing ﬁrst part of the subnet mask value.

11. Use the ‘s’ up or ‘t’ down buttons to change the address setting (between 0 and 255).

12. Press ‘3’ accept and repeat for the second, third and fourth subnet values. The number of dots in the upper left indicates which part of the subnet address is being viewed.

13. Press ‘3’ to update the changes (UPdt displayed). The unit will request a reboot to implement the IP conﬁguration.

Note

If the IP address is changed the new settings

will not be implemented until the Midas unit is rebooted.

7�2�7 Set pass code ‘ PWd’

1. Select the set pass code ‘ PWd’ submenu and press ‘3’ to accept.

2. Press ‘s’ up or ‘t’ down to set the ﬁrst pass code value. (Note: Holding down the button will increase the increment speed).

3. Press ‘3’ to enter the ﬁrst value and move to setting the second value.

4. Press ‘s’ up or ‘t’ down to set the second value.

5. Press ‘3’ to enter and repeat for the third and forth values in the passcode.

6. To conﬁrm the pass code re enter it again using the same procedure.

7. The new pass code will be saved after the last entry if the two entered passcodes are

the same.

®

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7-8

Midas® Gas Detector

Note

Pass codes can be set between 0001 and

9999. Setting the pass code to 0000 will

switch off the pass code. If a pass code is forgotten contact your local Honeywell Analytics service department. In the event that a pass code is forgotten by the user, Honeywell Analytics is not responsible for any costs associated with the recovery of the passcode nor for any inconvenience incurred while the user is unable to access protected settings. It is strongly advised that the user record all pass codes with the instrument serial number in a secure and separate location to the Midas® unit. Delays in recovering the lost passcodes may be experienced and are not the responsibility of Honeywell Analytics.

7�2�8 Set LCD Backlight mode

1. Select the set LCD mode ‘LCD’ submenu and press ‘3’ to accept.

2. The ﬂashing LCD Backlight mode conﬁguration (bm:m or bm:c ) is displayed.

3. Use the ‘s’ up or ‘t’ down buttons to change the conﬁguration.

4. Press ‘3’ to set LCD backlight mode. (UPdt displayed)

5. Press ‘X’ to return to set-up, calibration and test menu selection.

6. Press ‘X’ again to return to normal operation.

conﬁguration is displayed.

3. Use the ‘s’ up or ‘t’ down buttons to change the conﬁguration.

(Note : Holding down the button will increase

the increment speed.)

4. Press ‘3’ to set Pump Control Frequency.

(UPdt displayed)

5. Press ‘X’ to return to set-up, calibration and test menu selection.

6. Press ‘X’ again to return to normal operation.

7�2�9 Set Pump control frequency

1. Select the set Pump Control Frequency ‘PUmP’ submenu and press ‘3’ to accept.

2. The flashing Pump Control Frequency

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7-9

Midas® Gas Detector

7�3 Calibration Menu ‘ CAL’

The calibration menu allows the calibration settings of the detector to be changed. The calibration menu comprises of 4 submenus as shown in the table below.

Table 7-4� Calibration mode submenus�

Calibration submenu

Zero Set detector zero

Span Set detector span

Flow Calibrate detector sample flow rate

mA mA Calibrate detector analog output

To select the calibration menu from normal operation, press the ‘s’ up button for a few seconds. Enter the pass code (if set). Use the ‘s’ up or ‘t’ down buttons to select the calibration menu ‘ ’ icon and press the ‘3’ accept button.

7�3�1 Zero Calibration ‘ 0CAL’

1. Use the ‘s’ up or ‘t’ down buttons to select the zero calibration ‘ 0CAL’ submenu and press ‘3’ to accept.

2. The zero calibration icon starts ﬂashing in order to tell the user to prepare to apply zero gas.

3. The inhibit ‘ ’ icon is also displayed indicating that no alarm outputs will be generated during this process.

4. Press ‘3’ to conﬁrm when ready and the icon goes steady.

5. Apply the zero gas (or ambient air).

6. The dots on the left of the display indicate progress to a successful zero.

Icon Calibration setting

7. The display will show the zero gas reading and if measured to be stable for an appropriate period of time will display ‘PASS’.

8. If the zero calibration is unsuccessful then the display will show an error code (see table below).

9. Press ‘3’ to exit.

10. Press ‘s’ up or ‘t’ down to select another submenu.

11. Press ‘X’ to return to set-up, calibration and test menu selection.

12. Press ‘X’ again to return to normal operation.

7�3�2 Span Calibration ‘ SPAn’

1. Use the ‘s’ up or ‘t’ down buttons to select the span calibration ‘ SPAn’ submenu and press ‘3’ to accept.

2. The span calibration icon starts ﬂashing in order to tell the user to prepare to apply span gas.

3. The inhibit ‘ ’ icon is also displayed indicating that no alarm outputs will be generated during this process.

4. Use the ‘s’ up or ‘t’ down buttons to select the gas ID code of calibration gas (for multi gas ID sensor cartridges only) and press ‘3’ to accept. (Refer to Appendix B for details of gas ID codes).

5. Use the ‘s’ up or ‘t’ down buttons to select if humidiﬁed ‘HUm’ or dry ‘drY’ calibration gas is being used.

6. Use the ‘s’ up or ‘t’ down buttons to change the value to the concentration of span calibration gas being used.

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7-10

Midas® Gas Detector

7. Press ‘3’ to conﬁrm when ready and the icon goes steady.

8. Apply the span gas.

9. The dots on the left of the display indicate progress to a successful span.

10. The display will show the span gas reading and if measured to be stable for an appropriate period of time will display ‘PASS’.

11. If the span calibration is unsuccessful then the display will show an error code (see below).

12. Press ‘3’ to exit.

13. Press ‘s’ up or ‘t’ down to select another submenu.

14. Press ‘X’ to return to set-up, calibration and test menu selection.

15. Press ‘X’ again to return to normal operation

Note

The change in the gas bottle icon’s contents gives an indication as to the relative stability of the gas reading. The arrows and bars inside the cylinder indicate whether it is rising or falling as appropriate (see table below).

Table 7-5� Calibration codes�

Code Code meaning

PASS Successful Calibration

FL:0H Zero Calibration Timeout - Over Range

FL:0L Zero Calibration Timeout - Under Range

FL:0U Zero Calibration Timeout - Unstable

FL:SH Span Calibration Timeout - Over Range

FL:SL Span Calibration Timeout - Under Range

FL:SU Span Calibration Timeout - Unstable

Table 7-6� Calibration stability icons�

Stable

Over-Range

Unstable-Rising

Unstable-Flat

Unstable-Falling

Under-Range

7�3�3 Flow Calibration ‘ FLoW’

1. Use the ‘s’ up or ‘t’ down buttons to select the ﬂow calibration ‘ FLoW’ submenu and press ‘3’ to accept.

2. The ﬂow icon with the dot at the bottom starts ﬂashing in order to tell the user that the unit is ready to read the zero ﬂow offset.

3. The inhibit ‘ ’ icon is also displayed indicating that no alarm outputs will be generated during this process.

4. Press ‘3’ to conﬁrm and the icon goes steady and a count down from 10 is shown as the zero ﬂow offset is read.

5. The display will show the ﬂashing ﬂow icon with the dot approximately 1/2 way up the icon to tell the user to set the set point 1 ﬂow (500 cc/min).

6. Press ‘s’ up or ‘t’ down keys to adjust the reading on the external ﬂow meter to the setpoint 1 target value.

(NOTE: The reading must be +/- 50 cc/

min of target to be accepted).

7. Press ‘3’ to confirm and the target value ﬂashes.

8. Press ‘s’ up or ‘t’ down to enter the actual

Midas Technical Handbook

7-11

Midas® Gas Detector

value read on the external flow meter. (NOTE: Holding down the button will increase the increment speed).

9. Press ‘3’ to conﬁrm and the icon goes steady and a count down from 10 is shown as the setpoint 1 value is read.

10. The display will show the ﬂashing ﬂow icon with the dot 3/4 ways up to tell the user to set the set point 2 ﬂow (650 cc/min).

11. Press ‘s’ up or ‘t’ down keys to adjust the reading on the external ﬂow meter to the set point 2 target value. be +/- 50 cc/min of target to be accepted).

12. Press ‘3’ to confirm and the target value ﬂashes.

13. Press ‘s’ up or ‘t’ down to enter the actual value read on the external flow meter. (NOTE: Holding down the button will increase the increment speed).

14. Press ‘3’ to conﬁrm and the icon goes steady and count down from 10 is shown as the setpoint 2 value is read.

15. If successful the display shows UPdt (update) and the ﬂow calibration is complete.

16. Press ‘s’ up or ‘t’ down to select another submenu.

17. Press ‘X’ to return to set-up, calibration and test menu selection.

(NOTE: The reading must

original mounting bracket, this calibration procedure must be followed to assure proper output voltages as the factory calibration is invalidated.

1. Use the ‘s’ up or ‘t’ down buttons to select the mA calibration ‘mA 4-20’ submenu and press ‘3’ to accept.

2. The display shows 4.00 mA indicating that the analog output should be reading 4 mA

3. The inhibit ‘ ’ icon is also displayed indicating that no alarm outputs will be generated during this process.

4. Use the ‘s’ up or ‘t’ down buttons to adjust the analog output to read 4.00 mA.

5. Press ‘3’ to accept.

6. The display will show 20.00 indicating that thePress ‘3’ to update the changes (UPdt displayed) and return to step 1.

7. Press ‘s’ up or ‘t’ down to select another submenu.

8. Press ‘X’ to return to set-up, calibration and test menu selection.

9. Press ‘X’ again to return to normal operation.

7�3�4 mA Calibration ‘mA 4-20’

This function permits the calibration of the 4-20 mA output using an external source such as an ammeter. The purpose of this calibration is to assure the proper output voltage to activate external alarms/relays.

If the Midas chassis becomes disassociated from its

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7-12

Midas® Gas Detector

7�4 Test Menu ‘ tESt’

The test menu is used to test the detector gas reading using bump test gas, and for simulation of alarm and fault display and output operation (relay, analog and digital). The test submenu also includes the detector inhibit facility. The test menu comprises of 3 submenus as shown in the table below.

Caution

When using the Test Mode with the Midas®, be aware that simulations for alarm and fault will trigger any connected devices from the relay, mA, and/or digital outputs (Modbus /TCP, LonWorks®) as if a real alarm or fault is present� If you wish to avoid activating any connected alarms or devices use the Inhibit mode to prevent an

unwanted alarm�

Table 7-7� Test mode submenus�

Test

Submenu

Bump bUmP

4-20 4-20 mA Stimulate current output

Inhibit Inh

Alarm/Fault SIm Simulate an alarm and fault condition

To select the test menu from normal operation, press the ‘s’ up button for a few seconds. Enter the pass code (if set). Use the ‘s’ up or ‘t’ down buttons to select the test menu ‘ ’ icon and press the ‘3’ accept button.

7�4�1 Bump Test ‘ bUmP’

Display

Icon Test

Bump test detector with inhibited alarm outputs

Put the unit into/out of an inhibit state and set inhibit time out

1. Use the ‘s’ up or ‘t’ down buttons to select the bump test ‘ bUmP’ submenu and press ‘3’ to accept.

2. The inhibit ‘ ’ icon is also displayed indicating that no alarm outputs will be generated during this process.

3. Apply the bump test gas and the display will show the measured gas concentration.

4. Remove the bump test gas and allow the detector reading to return to zero.

5. Press ‘X’ to exit.

6. Press ‘s’ up or ‘t’ down to select another submenu.

7. Press ‘X’ to return to set-up, calibration and test menu selection.

8. Press ‘X’ again to return to normal operation.

Note

In bump test mode, the Modbus/TCP outputs

are not inhibited. Only the 4-20mA and alarm outputs are inhibited.

The bump gas test is a functional check only. Consult local guidelines for recommended best practices. Bump test concentrations recommended in Section 17 are calculated to generate a minimum first alarm level response.

7�4�2 Alarm/Fault Test ‘ SIm’

1. Use the ‘s’ up or ‘t’ down buttons to select the alarm/fault test ‘ SIm’ submenu and press ‘3’ to accept.

2. The display shows ‘SIm’ and the A1 ‘s’ icon.

3. Use the ‘s’ up or ‘t’ down buttons to select A1 ‘s’, A2 ‘ ’ or Fault ‘ ’ for test simulation. A

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7-13

Midas® Gas Detector

steady indicates an m9 simulated fault and a ﬂashing is an F39 simulated fault.

4. Press ‘3’ to select and ‘SurE’ is displayed to indicate that the next step will activate the selected output (relay, analog and digital)

5. Press ‘3’ and the display ﬂashes ‘on’ indicating that the selected output is activated

6. Press ‘X’ to return to step 2 and select a different output for test.

7. Press ‘X’ to exit.

8. Press ‘s’ up or ‘t’ down to select another submenu.

9. Press ‘X’ to return to set-up, calibration and test menu selection.

10. Press ‘X’ again to return to normal operation.

Note:

If latching faults or latching alarms are set up and either of those are simulated, then the user

will have to reset them with the ‘X’ button in

normal operation mode.

7�4�3 Inhibit State ‘ InH’

1. Use the ‘s’ up or ‘t’ down buttons to select the inhibit ‘ InH’ submenu and press ‘3’ to accept.

2. The display ﬂashes ‘nonE’ indicating there is no inhibit currently set.

3. Use the ‘s’ up or ‘t’ down buttons to select alarm, alarm and fault or all (Alm, AL-Ft or ALL) output inhibit states. See Table 7-8 for details of inhibit states.

4. Press ‘3’ to accept the selected inhibit state.

5. Press ‘s’ up or ‘t’ down to set the inhibit timeout (between 0 minutes and 4 hrs - default 30 minutes).

6. Press ‘3’ to accept (UPdt displayed).

7. The selected outputs will be inhibited until the inhibit timeout has elapsed.

Note

If the inhibit timeout elapses before the inhibit state is set back to ‘nonE’ the maintenance fault code M17 will be displayed.

8. To take the unit out of inhibit, select the inhibit ‘ ’ InH submenu and press ‘3’ to accept.

9. Use the ‘s’ up or ‘t’ down buttons to select ‘nonE’

10. Press ‘3’ to return to the submenu selection.

11. Press ‘s’ up or ‘t’ down to select another submenu.

12. Press ‘X’ to return to set-up, calibration and test menu selection.

13. Press ‘X’ again to return to normal operation.

Table 7-8� Inhibit states�

Inhibit

State

None nonE No functions are inhibited.

Alarms Inhibited

Alarms and Faults Inhibited

Full Inhibit

Display Function

Alarm events will be detected, but alarm

ALm

AL-Ft

ALL

outputs (relays, 4-20 mA current loop and Ethernet) will be disabled.

Alarm and fault events will be detected, but alarm and fault outputs (relays, 4-20 mA current loop and Ethernet) will be disabled.

All monitoring functions inhibited. No monitoring is performed and no alarms or faults (except for Inhibit Timeout) will be reported.

7�4�4 Stimulate 4-20mA ‘4-20 mA’

1. Use the ‘s’ up or ‘t’ down buttons to select the

Midas Technical Handbook

7-14

‘4-20’ submenu and press ‘3’ to accept.

2. The display shows ‘S 04’ indicating a 4 mA output is being stimulated.

3. Use the ‘s’ up or ‘t’ down buttons to increase or decrease current as desired in the range of 1 to 21 mA. Displayed as “S xx” = xx indicating mA current being output.

4. Press ‘X’ to return to the ‘4-20’ submenu selection.

5. Press ‘X’ to return to set-up, calibration and test menu selection.

6. Press ‘X’ again to return to normal operation.

Caution

Proceeding with 20 mA stimulation may cause unexpected alarm activation�

Only authorized operators should perform this task!

Midas® Gas Detector

This mode cancels itself in 5 minutes�

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7-15

Midas® Gas Detector

8 Routine Maintenance

Midas Technical Handbook

8-1

Midas® Gas Detector

8 Routine Maintenance

Midas® is a fully serviceable product designed with modular components that can be readily replaced by trained service personnel so as to minimize the time that the gas detector is not available.

External in-line air ﬁlters should be replaced every three months or more frequently if the system is sampling in environments that have high levels of particulate matter or very acidic / wet atmospheres. Similarly, the internal particulate ﬁlter should be replaced once a year or more frequently if the sample lines are prone to heavy contamination.

Every sensor cartridge is shipped with a 12 month warranty and an extended 2 year warranty sensor cartridge is also available for purchase. All sensor cartridges are factory calibrated to traceable national standards before shipment to the end user.

Note that testing or calibrating with the wrong (incorrect, out of date, non-traceable) calibration gases, calibration equipment, methods or operating conditions can actually damage the sensor cartridge’s lifetime and alter the calibration adversely. Only qualiﬁed calibration technicians should attempt to calibrate the Midas® gas detector.

Recommended Maintenance Schedule

Component Frequency

Pump 2 years

Pyrolyzer (all models) 1 year

Internal Filter 2 years/as needed

External Sample Line Filter 780248 3-6 months

1991-0147 3-6 months 1830-0055 3-6 months 1830-0027 1 month

Leak Check Leak Check every 6 months

or after pump, pyrolyzer or internal ﬁlter replacement.

Bump Test 6 months

Flow Calibration Flow Calibrate after pump,

pyrolyzer or internal filter replacement.

See Appendix B for the correct ﬁlter requirement for your application.

Note

The CO2 cartridge’s bias battery will last

only about 9 months. After replacement,

allow at least a day for the cartridge to reach equilibrium.

Note

For details regarding sensor cartridge

calibration and bump testing method refer to Section 17.

The internal pump module is designed to operate for a minimum of 18 - 24 months and it is recommended that this pump module (part number MIDAS-A-007) be replaced every 2 years.

Midas Technical Handbook

8-2

Midas® Gas Detector

8�1 Sensor Cartridge Replacement

Honeywell Analytics recommends that the sensor cartridge be replaced without power to the Midas® unit. If ﬁtting a sensor cartridge to a unit that is powered, please refer to Section 7.4.3 to inhibit the detector’s

outputs.

8�1�1 Sensor Cartridge Fitting/Replacement

1. Unscrew the thumbscrew located on the front panel and remove the cover by pulling it forwards off the main chassis (see Diagram

27).

2. Ensure the power switch on the terminal module is in the off position.

3. Remove the old sensor cartridge from the unit (if ﬁtted) by unclipping the two sensor cartridge locking tabs located either side of the sensor cartridge and using them to ﬁrmly pull the sensor cartridge out (see diagram 23).

4. Fit the new sensor cartridge by aligning the pins at the top of the sensor cartridge with the socket in the sensor cartridge chamber.

5. Carefully push the sensor cartridge into the sensor cartridge chamber until fully home and lock in place using the tabs either side of the sensor cartridge (see diagram 24).

6. Switch the power switch on the terminal module to the ‘on’ position.

7. Refit the detector’s cover by aligning the slots either side with the locating tabs on the mounting bracket assembly and pushing the cover horizontally until home. Tighten the thumbscrew located on the front panel (see diagram 25).

8. Conﬁrm that the LCD messages “LOAd” and “WArm” are replaced by a zero concentration display. Conﬁrm that the yellow fault LED is off.

Note

If replacing a sensor cartridge with a different gas type sensor cartridge the display will scroll the message ‘ChAngE gAS?’ If you are changing the sensor cartridge gas type press ‘3’ to accept. If not, t the correct sensor cartridge. The pass code (if set) must be entered to change sensor cartridge gas type. To set the correct gas for a multi gas type sensor cartridge refer to Section 7.2.2.

Diagram 8-1� Removing detector cover

REMOVING COVER

chassis

midas

Gas Sensor Cartridge

NITROGEN

TRIFLUORIDE

NF3

PN : MIDAS-S-HFX SN : 0234456670 Use by : 07-09-2006

mounting

bracket

Diagram 8-2. Removing sensor cartridge

chassis

sensor

m

idas

G

as

S

e n

s or Car

t r idg

e

NITR

OGEN

T

R

IF

LU

O R

IDE

NF

3 P N

: MID

AS-S-HF

SN :

X 0 2344566

U se

7

by :

0 0 7

-

ze

0

9

-2

llwege

006

r anal

ytics

loosen

cover

Midas Technical Handbook

8-3

Midas® Gas Detector

Diagram 8-3� Fitting/replacing sensor cartridge

midas

Gas Sensor Cartridge

NITROGEN TRIFLUORIDE

NF3

PN : MIDAS-S-HFX SN : 0234456670 Use by : 07-09-2006

midas

Gas

Sen

sor Car

tr idge

NITROGEN

TRIFLUORID

NF3

E

PN

: MIDAS-S-HFX

SN : 0234

456

Use by : 07-

670

09-2006

Caution

When retting the cover to the Midas® unit, use caution to prevent damage to the RFI

shielding tabs attached to the chassis.

8�2 Pump Replacement

The pump module has been designed to allow easy replacement. New pump modules, (MIDAS-A-007), are supplied with new springs, bracket and tubing preassembled for quick release / replacement.

Diagram 8-5� Location of pump module�

Pump module

(MIDAS-A-007)

The following procedure should be followed carefully and only performed by suitably trained personnel.

1. Isolate the power to the detector.

2. Unscrew the thumbscrew located on the front panel.

3. Remove the cover by pulling it forward off the main chassis.

4. Unscrew the two retaining screws located at the bottom front of the chassis.

5. Pull the main chassis forward to disconnect it from the mounting bracket assembly.

6. Remove the 4 pump module screws.

Midas Technical Handbook

8-4

7. Remove the two ﬁxing clips and disconnect the tubes at the manifold.

8. Slide the pump module out and disconnect the connector from the pcb.

Midas® Gas Detector

9. Fit the new pump module following the steps above in reverse order. Orient the metal retaining clamps away from the pump wiring to prevent damage. Route pump wiring away from the chassis and manifold to prevent damage.

8�3 Reassembling the Detector

1. Align the PCB at the top rear of the main chassis with the connector located at the top of the mounting bracket assembly.

2. At the same time align the two tubes at the bottom rear of the main chassis with the two tubes located on the bottom of the mounting bracket assembly.

3. Slide the chassis backwards on the mounting bracket assembly so that the PCB, connector and tubes engage simultaneously.

4. Ensure the PCB, connector and tubes are fully engaged by ﬁrmly pushing the main chassis horizontally backwards on the mounting bracket assembly. (WARNING: DO NOT PUSH ON THE LCD AS THIS MAY CAUSE DAMAGE).

5. Align the two attaching screws located at the

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8-5

Midas® Gas Detector

bottom of the chassis with the screw threads on the mounting bracket assembly.

6. Tighten the screws to secure the chassis to the mounting bracket assembly.

7. Switch the power switch on the terminal module to the ‘on’ position.

8. Reﬁt the detector’s cover by aligning the slots either side with the locating tabs on the mounting bracket assembly.

9. Push the cover horizontally until home.

10. Tighten the thumbscrew located on the front panel.

Note

Honeywell Analytics recommends

conducting a “Flow Calibration” (See

Section 7.3 for instructions)

8�4 Filter Replacement

The internal ﬁlter (MIDAS-A-009) has been designed for easy replacement.

The following procedure should be followed carefully and only performed by suitably trained personnel.

1. Isolate the power to the detector.

2. Unscrew the thumbscrew located on the front panel.

3. Remove the cover by pulling it forwards off the main chassis.

4. Unscrew the two retaining screws located at the bottom front of the chassis.

5. Pull the main chassis forward to disconnect it from the mounting bracket assembly.

6. Locate the ﬁlter access slot in the side of the main chassis.

Diagram 8-6� Filter location�

Main chassis

Filter access slot

Filter

(MIDAS-A-009)

7. Carefully disconnect both sides of the ﬁlter from the pump manifold.

8. Remove the old ﬁlter and replace with a new ﬁlter ensuring that the ﬁlter connectors are fully engaged in the manifold ports and that the ﬁlter is the correct orientation (arrow pointing downwards). Orient the metal retaining clamps away from the pump wiring to prevent damage.

9. Route pump wiring away from the chassis and manifold to prevent damage.

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8-6

Midas® Gas Detector

Diagram 8-7� Filter orientation�

Filter connector

Manifold ports

➭

New lter

correct orientation

8�5 System Leak Check Procedure

Caution

When performing a leak check, the Midas® must be placed in inhibit mode to prevent false concentrations or faults to be activated when plugging the Sample and/or Exhaust Lines�

Example: O2 (oxygen) – plugging of the ports causes the O2 levels within the Midas® ow path to be depleted as the sample becomes stagnant� The result is the concentration levels begin to fall and trigger the alarms for the O2 depletion�

3. The ﬂow meter indicators will begin to drop and ultimately disappear (within seconds) (see

Diagram 2-3)

4. Continue to keep the port plugged until the Midas® reports an “F81” (Flow Fail) – approximate time to fault is 1 minute

5. Remove the plug

6. Allow 15 seconds or so to allow the Midas® ﬂow to stabilize then clear the fault by pressing and holding ‘X’

7. Plug the Outlet Exhaust line

8. The ﬂow meter indicators will begin to drop and ultimately disappear (within seconds)

9. Continue to keep the port plugged until the Midas® reports an “F81” (Flow Fail) – approximate time to fault is 1 minute

10. Remove the plug

11. Allow 15 seconds or so to allow the Midas® ﬂow and concentrations to stabilize then clear the fault by pressing and holding ‘X’

12. Return the unit to normal operation

Diagram 8-8� Port Location�

Gas inlet port

1. Place the Midas® into Inhibit (see Section 7.4.3)

2. Plug the Inlet Sample line (see Diagram 8-8)

Midas Technical Handbook

Gas outlet port

8-7

Midas® Gas Detector

9 Pyrolyzer Module

Options

Midas Technical Handbook

9-1

Midas® Gas Detector

Midas Gas Detector

9 Pyrolyzer Module Options

Two Midas Pyrolyzer modules are available to detect speciﬁc gases (consult the Midas data sheets for an updated list of detectable species). The pyrolyzer module option is installed under the Midas gas detector. An air sample is drawn through the pyrolyzer and the target ﬂuorinated compounds are converted into hydrogen ﬂuoride (HF) gas by means of pyrolysis at a high temperature which is optimized for each gas family. The residual HF is then measured by the appropriate sensor cartridge and the concentration is calculated from this result. This concentration is then displayed in actual ppm on the Midas’ LCD display.

The standard Midas pyrolyzer unit (P/N MIDAS-T0P3) detects nitrogen triﬂouride (NF3 08-03). NF3 pyrolyzer units require a Freon end-of-line ﬁlter

Diagram 9-1 illustrates the various pyrolyzer conﬁgurations. This table shows that gases which can be detected by the Midas Pyrolyzer module.

Detectable Gases

Cartridge

Part No.

MIDAS-E-XHF, MIDAS-S-XHF

MIDAS-E-XCF, MIDAS-S-XCF

Gas

NF

CH3F

C4F

C5F

CH2F

SF

Gas

ID

02

3

03

02

6

03

8

04

2

05

6

(P/N 1830-0027). The ﬁlter is ﬁlled with charcoal to remove Freon and other similar compounds from the sample gas before it is “cracked” in the pyrolyzer.

Note that the pyrolyzer module is ideally suited for leak detection rather than analytical detection of very low trace amounts of PFC compounds.

Diagram 9-1� Midas gas detector with Pyrolyzer modules MIDAS-T-OP3 (left), MIDAS-T-OOP (center), MIDAS-T-HTP (right)�

Ventilated To p Cover (MIDAS-A-039)

Midas Technical Handbook

Midas Pyrolyzers

9-2

Midas® Gas Detector

Laminar flow element

To maintain sensor accuracy when using the pyrolyzer, do not allow the ambient temperature at the point of installation to exceed 30°C (86°F). Operation above this temperature may require more frequent bump testing or calibration to conﬁrm working speciﬁcation. Because of the higher operating temperatures when using the pyrolyzer module, Honeywell Analytics strongly recommends that the ventilated Midas Top Cover (part number MIDAS-A-039) be used in all pyrolyzer applications.

NOTE: The Pyrolyzer module is serviceable only by trained personnel or by Honeywell Analytics’ Service Center. Inappropriate handling can cause injury and device damage.

Note: Le module pyrolyzer pouvant-être réparé. Par contre la réparation doit-être effectuée par un personnel qualiﬁé ou à un centre de service autorisé d’Honeywell Analytics. Une manutention inadéquate pourrait causé des blessures ainsi que des dommages à l’appareil.

Diagram 9-2 shows the main components of the pyrolyzer.

Diagram 9-2� Pyrolyzer components�

Diagram 9-2. Pyrolyzer components.

Diagram 9-3 shows in a simple form how a gas sample is drawn through the pyrolyzer module by the pump (located at the end of the gas path). It is ﬁrst routed to the pyrolyzer via the Freon ﬁlter before being sent to the gas sensor cartridge, where the gas measurement is taken. The sample continues via the ﬂow meter through the dust ﬁlter and is ﬁnally exhausted from the instrument. Adjustment of the gas ﬂow through the instrument is done automatically. It is recommended to perform a leak check (see Section

8.5) before performing a ﬂow calibration. To perform

a ﬂow calibration refer to Section 7.3.3.

Diagram 9-3. Pyrolyzer conguration gas ow.

(Flow measurement)

Pump

Orifice

(Bypass flow)

Pressure sensor

Gas sensor

Pyrolyzer Heater

Pyrolyzer

Midas Technical Handbook

9-3

Gas sample

Exhaust

Freon filter

Gas sample

Inlet

Needle Valve (Heater flow adjustment)

Note: Model 0P-3 does not require flow adjustment.

Midas® Gas Detector

sample outlet port

9�1 Fitting the Pyrolyzer Module

1. Disconnect power to the detector.

2. Unscrew the thumbscrew on the front panel.

3. Remove the cover by pulling it forward off the chassis, as illustrated in Diagram 9-4.

Diagram 9-4� Removing the Midas cover�

chassis

4. Unscrew the two retaining screws located at the bottom front of the chassis.

5. Pull the chassis forward to disconnect it from the mounting bracket assembly (see Diagram 9-5).

cover

thumbscrew

retaining screws (2)

mounting bracket

sample inlet port

Diagram 9-5� Removing the chassis�

chassis

mounting bracket

6. Thread the connector and wire harness from the pyrolyzer through the rectangular access in the bottom of the mounting bracket.

7. Secure the wires with a retention clip (if available).

8. Plug the connector into the socket (con5) at the bottom left of the terminal board.

9. Align the ﬁtting at the top rear of the pyrolyzer with the sample and inlet ports at the bottom of the mounting bracket.

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9-4

Midas® Gas Detector

10. Connect the pyrolyzer to the detector with the three provided mounting screws (see Diagram 9-6).

Diagram 9-6� Attaching the pyrolyzer�

terminal module

socket (con5)

connector

tubes

power switch

rectangular access at bottom of bracket

mounting screws (3)

pyrolyzer

WARNING To maintain sensor accuracy

when using the pyrolyzer, do not allow the ambient temperature at the point of installation to exceed 30°C (86°F)� Operation above this temperature may require

more frequent bump testing or calibration to conrm working specication. Because of the higher operat-

ing temperatures when using the pyrolyzer module, Honeywell Analytics strongly recommends that the ventilated Midas Top Cover (part number MIDASA-039, shown in Diagram applications�

Note:

Consult the label on the side of the Pyrolyzer module, as shown in Diagram 9-7, for the rmware version level required in the Midas

detector for proper operation.

Diagram 9-7� Pyrolyzer labels�

P/N: MIDAS-T-0P3

05/06 REV 3 S/N:00001

For Non-Flammable Gases Only

www.honeywellanalytics.com

9-1) be used in all pyrolyzer

Midas Technical Handbook

This pyrolyzer is to be used only with

Midas Extractive units equipped with

version 1.10 or later application software.

9-5

Midas® Gas Detector

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chassis

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9�2 Reassembling the Detector

1. Align: a. the PCB at the top rear of the chassis

with the PCB connector at the top of the mounting bracket and

b. the two tubes at the bottom rear of the

chassis with the two tubes on the bottom of the mounting bracket.

2. Slide the chassis backward on the mounting bracket assembly so that the PCB, connector, and tubes engage fully. Push the chassis backward on the mounting bracket. CAUTION:

The LCD is fragile� Do not apply pressure to its surface�

3. Tighten the retaining screws to secure the chassis to the mounting bracket.

4. Insert the MIDAS-S-HFX sensor cartridge into the sensor cartridge chamber (see Diagram 9-8) and refer to the Sensor Cartridge Installation Quick Start Guide (MIDAS-A-021).

5. Set the power switch to the “on” position.

6. Reﬁt the ventilated top by aligning the slots

on either side with the locating tabs on the mounting bracket assembly, shown in Diagram 9-9. Push the cover horizontally until seated.

Diagram 9-9. Retting the top cover.

slots (2)

Diagram 9-8� Reassembling the detector�

Midas Technical Handbook

tabs (2)

cartridge

9-6

Midas® Gas Detector

thumbscrew

9.3 Conguring the Detector

1. After completion of the startup sequence, press the “p” button for a few seconds to select the setup menu.

2. Enter the passcode (if necessary).

3. Use the “p” or “q” buttons to select the setup menu “ ” icon. Press the “P” to accept.

4. Use the “p”or “q”buttons to select the set alarms “ ALm” submenu. Press “P” to accept.

5. The ﬂashing gas ID code and the gas cylinder and alarms icon “ ’’ will appear.

6. Use the “p” or “q” buttons to change the gas ID number to that of the target gas. Press “P”to accept.

7. Continue to accept or change the rest of the alarm settings. For further details on these settings, refer to the Midas Operating Instructions (part number MIDAS-A-001).

8. Press “P” to update all changes (“UPdt” will be displayed).

9. Press “X” twice to return to normal operation.

9�4 Replacing the Pyrolyzer Heater Block

WARNING: The Pyrolyzer module becomes extremely hot during operation� Allow it to

cool

before beginning this procedure�

AVERTISSEMENT: Le module pyrolyzer devient extrêmement chaud à l’usage� Veuillez alloué une période de refroidissement avant de débuter cette procédure�

1. Loosen the thumbscrew on the top of the unit as shown in Diagram 9-10.

Diagram 9-10� Loosening the thumbscrew

After applying power, verify that the sensor cartridge ID and gas ID are appropriate for the target gas. See Appendix B for gas ID codes. Refer to Section

7.2.2 for the procedure for setting the gas ID code.

The Midas gas detector automatically detects the pyrolyzer module and provides the necessary power and signaling for the device.

Midas Technical Handbook

2. Slide the front cover out of the C-enclosure (see Diagram 9-11).

Diagram 9-11� Removing the front cover

9-7

3. Disconnect the Viton tube from the upper micro

P-clip and lock nut

heater wire connector

Viton tube

C-enclosure

heater block assembly

tube port. Discard the Viton tube (Diagram 9-12). Replacement Viton tubing is supplied with the new heater block.

4. Remove the P-clip and lock nut.

5. Disconnect the thermocouple and heater wires from their PCB connectors.

6. Remove the bolt from the manifold assembly.

Diagram 9-12� Disconnecting the heater block

Viton tube

upper microtube port

manifold bolt

Midas® Gas Detector

quartz tube port

thermocouple

connector

7. Disconnect the lower Viton tube from the quartz tube port. (If necessary, swing the heater unit as shown in Diagram 9-13.) Discard the old Viton tube.

Diagram 9-13� Disconnecting the lower Viton tube

Midas Technical Handbook

8. Remove the heater block assembly by ﬁrst lifting it up and then sliding it out of the keyhole connector in the C-enclosure (Diagram 9-14).

Diagram 9-14� Removing the heater block assembly

keyhole connector

9. Reverse steps 1 through 8 to install the new heater block assembly.

9-8

Midas® Gas Detector

10 Optional LonWorks®

Interface Installation

Midas Technical Handbook

10-1

Midas® Gas Detector

Diagram 10-1. Midas® LonWorks® module.

Midas® LonWorks® Module

10 Midas LonWorks® Interface Module

10�1 LonWorks® Installation

Midas® can be directly integrated within a LonWorks® network using an optional interface module (MIDAST-LON). This gateway provides both power and communications to the Midas® transmitter and creates a LonWorks® node on the network. All gas readings, faults and other sensor data are transmitted via the LonWorks® protocol. Any Midas® transmitter can be easily configured to connect with the LonWorks® interface module.

The Midas® LonWorks® interface module is installed behind the standard Midas® gas detector as shown in Diagram 10-1. Power and data connections are supplied directly to the LonWorks® interface module. All power to the Midas® unit is provided via the LonWorks®

interface.

Diagram 10-1� Midas® LonWorks® module�

10�1�1 Fitting the LonWorks® Module

1. Unscrew LonWorks® interface top plate.

2. Mount the interface and tighten screws. See mounting template on reverse side.

3. Connect 24V DC power and LonWorks® wires to the pluggable connectors. Clamp the cables in the supplied gland as shown in Diagram 10-

2. A spare gland is included.

4. Reinstall top plate on the interface.

5. Loosen thumbscrew on front of Midas®.

6. Remove unit cover.

7. Loosen two screws on bottom front of chassis.

8. Separate main chassis from mounting bracket assembly.

9. Mount the Midas® mounting bracket assembly onto the LonWorks® interface.

10. Tighten screws.

11. Align the PCB at the top rear of the main chassis with the connector located at the top of the mounting bracket assembly.

12. Slide the main chassis backwards on the mounting bracket assembly so that the PCB and connector and tubes engage simultaneously.

WARNING: DO NOT PUSH ON THE LCD AS THIS MAY CAUSE DAMAGE

13. Tighten the screws to secure the main chassis to the mounting bracket assembly.

14. Reinstall cover

Customer Wiring

Midas® to LonWorks® Interface Cable

Midas Technical Handbook

MIDAS-A-040

10-2

Midas® Gas Detector

Diagram 10-2� LonWorks Cable Gland�

10�1�2 Wiring the Midas® for LonWorks®

Wiring Diagram

Pwr Common Pwr +24 VDC

Lon A Lon B

Pwr Common Pwr +24 VDC

Lon A Lon B

Plug 2

Plug 1

5. LonWorks® FT-10 wiring is polarity sensitive. Lon A and Lon B may be swapped.

10.1.3 Conguring the Midas® for LonWorks®

1. Turn on 24 VDC power.

2. Conﬁrm that the Midas® initiates the power up sequence.

3. Reset Fault F49 if present.

4. Set alarm levels and other parameters as desired.

5. Conﬁrm that the Midas® IP parameters are at default values. If changed, the DHCP client must be set to ‘n’. The IP address must be restored to 169.254.60.47 and the subnet mask must be restored to 255.255.255.0

Wiring Notes:

1. Maximum wire size is 16 AWG.

2. Input voltage range is 20.4 to 26.4 VDC.

3. It is mechanically possible to misalign Plug1 and Plug2. Care must be taken when inserting plug to assure correct alignment.

4. Plug1 and Plug2 are internally connected in parallel to facilitate wiring in bus topology.

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10-3

Midas® Gas Detector

10�2 LonWorks® Software

10�2�1 LonWorks® Overview

LonWorks® is a communications protocol developed by Echelon Corporation which facilitates peer-to-peer communications in a control network. The Midas® gas detector is available with an optional LonWorks®

interface.

The Midas® uses the Free Topology (FT) physical layer which communicates at 78 Kbaud. Each FT segment can contain up to 64 nodes and up to 2.7 Km of cable. Routers permit expansion of the network to multiple segments.

The Midas® LonWorks® interface contains 2 functional blocks, 19 network variables and 2 network conﬁguration inputs. It is designed for compliance with LonMark guidelines version 3.2. However, it is not LonMark certiﬁed. The LonMark representation of the interface is shown in Diagram 10-3.

Information on LonWorks® can be found at www.echelon.

com. Information on LonMark can be found at www. lonmark.org. Many commercial LonWorks-compatible

products can be found at www.engenuity.com.

Diagram 10-3� LonMark Diagram

MIDAS LonWorks Gateway Dev ice

Open-loop sensor Functi onal Block

nv1

Mandatory

nviRel ay1

SNV T_lev_ disc

nviRel ay2

SNV T_lev_ disc

nviRel ay3

SNV T_lev_ disc

Implementation-Specific

nviRes et

Node Object Functional B loc k

nv1

cp22

cp24

nviRequest

SNV T_obj_request

Implementation-Specific

nciMaxSendT

SNV T_elapsed_tm

nciMi nSendT

SNV T_elapsed_tm

Virtual Function Bl ock

nv2

Mandatory

nv3

nvoConc

SNV T_ppm_f

nvoAl m2

SNV T_lev_ disc

nvoAl mL

SNV T_lev_ disc

nvoAl mS

SNV T_switc h

nvoAl mThresh1

SNV T_ppm_f

nvoAl mThresh2

SNV T_ppm_f

nvoCell Life

SNV T_elapsed_tm

nvoFaultD

SNV T_lev_ disc

nvoFaultS

SNV T_switc h

nvoGasSelection

SNV T_count

nvoMonState

SNV T_state

nvoNstat

SNV T_state

nvoStatus

SNV T_obj_status

nvoChkS um

SNV T_count

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10-4

Midas® Gas Detector

10�2�2 Network Variable Behaviors

The behaviors of the network variables are as detailed below:

nvoConc

This reports the concentration of the target toxic or ﬂammable gas in the SNVT_ppm_f data type. The concentration will be scaled in ppm when a toxic gas cartridge is installed. For example a 100 ppb B2H6 concentration will be reported as 0.1. However, when an O2 cartridge is installed, this will be scaled in volume percent. For example, normal air will be reported as

20.9, not 209000.0. Furthermore, concentration will be reported as a percentage of the lower explosive limit (LEL) for ﬂammable gas cartridges. This means that CH4 at a concentration of 50% LEL will be reported as 50.0, not as 25000.0 ppm.

Alarm Outputs

The alarm status of the Midas® is reported in three network variable outputs (NVOs) for maximum compatibility. The values of nvoAlmL, nvoAlm2, and nvoAlmS under various conditions are listed in Table 1. The variable nvoAlm2 is provided to facilitate discrimination between alarm1 and alarm2 by 3rd party actuators which treat SNVT_lev_disc as a Boolean data type. The variable nvoAlmS is provided to increase compatibility with Echelon LonPoint modules.

Note that the values stored in nvoAlmL are slightly different than that of other Honeywell Analytics / MDA Scientiﬁc gas detectors. For example, a Vertex will indicate a level 1 alarm by ST_MED. This is because ST_LOW is reserved for small non-zero concentrations below the alarm threshold. Additionally, the System

16, LIFELINE, LIFELINE II and CM4 indicate a level 2 alarm as ST_MED.

Table 10-1� Alarm Outputs

nvoAlmL

Alarm Status

(SNVT_lev_disc)

None ST_OFF ST_OFF {0.0, 0}

Level1 ST_LOW ST_OFF {0.5, 1}

Level2 without

Level 1 (only possible with

depletion

alarms)

Level 1 and 2

(usual case)

ST_MED ST_MED {1.0, 1}

ST_HIGH ST_MED {1.5, 1}

nvoAlm2

(SNVT_lev_disc)

nvoAlmS

(SNVT_switch)

nvoFaultD

This has the value ST_MED if an instrument fault exists and the value ST_LOW if a maintenance fault exists. If both faults exist, this takes ST_HIGH. It has the value ST_OFF if no fault exists.

A maintenance fault indicates the Midas® requires attention but is continuing to monitor. An instrument fault indicates a loss of monitoring.

nvoFaultS

This network variable output facilitates identifying the cause of the fault over the network. The .value byte of SNVT_switch will be the fault number. These are listed in Section 6 of the Midas® Quick Start Guide. Additionally, a communication failure will be reported as fault number 100. The .state byte of SNVT_switch has the value 1 if any fault exists. Otherwise it takes the value 0.

Note that the LonMark standard calls for the .value ﬁeld

Midas Technical Handbook

10-5

Midas® Gas Detector

to be divided by two for display. Thus the raw value is twice the fault number. For example when a ﬂow failure (Fault F81) exists, the raw value of nvoFaultS will be {0xA2, 0x01}. This is displayed by LonMark-compatible tools as {81.0, 1}.

Alarm Thresholds

The variables nvoAlmThres1 and nvoAlmThres2 reports the conﬁguration of the alarm setpoints. The scaling and format of the data is identical to that used with nvoConc. These are read-only data – it is not possible to change the alarm settings over LonWorks®.

nvoGasSelection

This NVO facilitates determining over the network what cartridge is installed and which calibration is selected. The most-signiﬁcant byte of this is equal to the sensor cartridge ID number. The least-signiﬁcant byte of this is equal to the gas ID number. Values for both are listed in Appendix B.

nvoCellLife

This reports the time remaining until the F43 (“Cartridge Expired”) is issued. Fault m12 (“Cartridge Expires Soon”) will generally be issued 30 days before F43. However, this variable provides no advance warning of fault m11 (“User Cal Expired”).

Table 10-2� nvoMonState Bit Assignment

bit

bit1bit2bit3bit4bit5bit6bit7bit8bit9bit10bit11bit12bit13bit

0

MSB

Always

Zero

Heartbeat

Counter

Always Zero

Monitoring Mode

Integer

14

bit 15

LSB

The description of the Monitoring Mode Integers are listed in Table 10-3 below.

Table 10-3� Monitor Mode Integer Description

Monitoring Mode Integer Description

0 Warmup

1 Monitoring without inhibit

2 Alarms inhibited

3 Alarms, and faults inhibited

4 Alarms, faults and concentrations inhibited

5 Simulation

6 Bump test mode

7 4-20 mA calibration mode

8 Other calibration mode

9 to 14 for future expansion

15 Communications failure.

nvoMonState

The bits in this variable are shown graphically in Table 10-2. The least-signiﬁcant 4 bits form a monitoring mode integer (MMI). Bit 7-2 form a heartbeat counter which increments every 2 seconds. The heartbeat counter is provided to facilitate confirmation of communication. This variable propagates every nciMinSendT since it is always changing.

Midas Technical Handbook

10-6

Midas® Gas Detector

nvoNstat

This NVO conveys the general status of the gas detector. The meanings of the 16 bits in this NVO are deﬁned in Table 10-4. Note that the presence of a maintenance fault is not conveyed by this variable.

Table 10-4� nvoStat Description

Bit Description

15

In calibration mode

(LSB)

14 In simulation mode

13 Inhibited

12 In warmup mode

11

Always zero, for future expansion

10

9 Alarm 2 active

8 Alarm 1 active

Instrument fault ﬁxable by new car tridge

7

(Faults 39 - 49)

Instrument fault ﬁxable by HA Service

6

(Faults 80, 82 - 89 or comm fail)

5 Flow instrument fault (F81)

4 Always zero, for future expansion

3

Measuring unit

2

1

0

(MSB)

code

Always zero, for future expansion

Bit3=0, Bit2=0: % Volume Bit3=0, Bit2=1: % LEL But3=1, Bit2=0: ppm

value is clamped to 180 seconds and 5 seconds, regardless of the programmed value.

Additionally, every NVO will repropagate when the status of its function block changes and nciMinSendT has expired since the last propagation. This has a default value of 5 seconds. The effective value is clamped to 10 seconds and 1 second.

nviRelay1, nviRelay2 and nviRelay3

These network variable inputs can be used to control the three internal relays from LonWorks®. However, these NVI’s will have no effect unless the Midas® is conﬁgured to respond to network relay commands.

The following procedure lists how to conﬁgure the relays to be remotely controllable:

a) Hold the “s” key for 2 seconds until “SEt” is

displayed.

b) Press the “3” key once to enter the setup menu.

The display should show “ALm”.

c) Press the “s” key once to scroll to fault setup.

The display should show “FLt”

d) Press the “3” key once to enter the fault setup

menu. The display will show one of the four relay conﬁguration codes shown in Table 5.

e) Press the “s” key as needed to select mode

“nEtr”.

nciMaxSendT, nciMinSendT

These network conﬁguration inputs control the update rate of the network variable outputs. Every NVO will repropagate after a period of nciMaxSendT or less. This has a default value of 60 seconds. The effective

Midas Technical Handbook

f) Press the “X” key repeatedly to exit the setup

menu.

The various relay conﬁguration options are listed in

Table 10-5.

10-7

Midas® Gas Detector

Table 10-5. Fault Relay Conguration options

LCD

Symbol

1FLt Instrument fault only Alarm 1 Alarm 2 Inst Fault

2FLt Separate fault relays Any Alarm Maint Fault Inst Fault

CmbF Combined fault relay Alarm 2 Alarm 2 Any Fault

nEtr Network remote mode nviRelay1 nviRelay2 nviRelay3

Description

Source of Signal for Relays

Relay 1 Relay 2 Relay 3

Once the relays are conﬁgured for network remote mode, they will respond to updates to the three associated NVIs. The values ST_LOW, ST_MED, ST_HIGH and ST_ON will cause the relays to energize. The value ST_OFF will cause the relays to de-energize. The conﬁguration settings for “normally energized” and “normally de-energized” have no effect if the relays are in network remote mode. However, the relays can still be conﬁgured for normally open or normally closed contacts by moving the jumpers on

the Midas® backplane PCB.

Caution

Several failure modes will cause the relays to de-energize� These modes include power failures and CPU lockups� Furthermore, power must be removed from the Midas® for certain maintenance procedures� External equipment should be designed to prevent creation of expensive or dangerous conditions when the relays de-energize� For applications requiring a highly-reliable digital output, Honeywell Analytics recommends purchasing a dedicated DO device�

nviRequest

Updates to this NVI have the effects listed in Table 10-6. These requests are usually sent by the network management tool.

Table 10-6� Request Implementation

Request

0 RQ_NORMAL Set to enabled Send “no inhibit” command

1 RQ_DISABLED Set to enabled Send “inhibit all” command

2 RQ_UPDATE_STATUS Retransmit status Retransmit status

3 RQ_SELF_TEST

4 RQ_UPDATE_ALARM

5 RQ_REPORT_MASK Send capability report

6 RQ_OVERRIDE

7 RQ_ENABLE Set to enabled Equivalent to RQ_NORMAL

8 RQ_RMV_OVERRIDE

9 RQ_CLEAR_STATUS

10 RQ_CLEAR_ALARM

11 RQ_ALARM_NOTIFY_ENABLE Equivalent to RQ_NORMAL

12 RQ_ALARM_NOTIFY_ DISABLE

13 RQ_MANUAL_CTRL

14 RQ_REMOTE_CTRL

15 RQ_PROGRAM

16 RQ_CLEAR_RESET

17 RQ_RESET

-1 RQ_NUL

Node Object

Implementation

Sensor Object

Implementation

Send “reset alarms and faults” command

Send “inhibit alarms” command

nviReset

This network variable input causes alarms and faults to be reset when it is updated with ST_LOW, ST_MED, ST_HIGH or ST_ON.

Midas Technical Handbook

Note that disabling the node object has no practical effect. (This is implemented only for LonMark compatibility.)

10-8

Midas® Gas Detector

nvoStatus

The meaning of the status bits in this NVO is as listed in Table 10-7.

Table 10-7� nvoStatus Implementation

LonMark Field

Name

object_id (16 bits) 0

invalid_id ID > 1

invalid_request

disabled disabled inhibited

out_of_limits

open_circuit

out_of_service

mechanical_fault instrument fault

feedback_failure

over_range alarm 2

under_range

electrical_fault maintenance fault

unable_to_measure

comm_failure communication failure to Midas

fail_self_test communication failure to Midas

self_test_in_progress warmup mode

locked_out

manual_control

in_alarm any alarm

in_override

report_mask mere capability report mere capability repor t

programming_mode

programming_fail

alarm_notify_disabled inhibit, warmup or calibration

reset_complete

Node Object Intrpretation

unimplemented request

made

Sensor Object interpretation

unimplemented request made

®

nvoChkSum

This network variable indicates the checksum of the neuron chip and is included to conﬁrm the correctness of the program. This will have the value 32533 for Revision 1.0 software. This is computed 45 seconds after power-up.

10�2�3 Other Characteristics

WINK Command

The LonWorks® “wink” command causes the service LED to energize for approximately six seconds.

LED Interpretation

All LED operation is inhibited for 35 seconds after power-up. This is because the neuron is held in reset until the internal ARM-7 microprocessor boots. If the neuron is “unconﬁgured”, after 35 seconds the yellow service LED will ﬂash slowly. If the neuron is “conﬁgured” the service LED will be dark.

The interface contains a second LED which can be useful for debugging. This is red in color and only visible when the lid is removed from the interface. It is labeled D15 and is located immediately below the black FT-X1 transformer on the PCB. D15 will blink every second when the neuron is executing code correctly. This will be “on” most of the time if communication to the Midas® is successful. It will be “off” most of the time if communications to the Midas® is unsuccessful. Communications is certain to be unsuccessful for 190 seconds after power-up due to the Midas® boot time.

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10-9

Caution

After commissioning, Echelon’s LonMaker

tool will put this device into the “ofine”

state� In this mode, the Midas® interface will not transmit over LonWorks®� To correct this, it is necessary to click-right,

on the device, select “Manage” and click on “Online”

Compatibility with old LonMaker

This device is observed to work incorrectly with Echelon LonMaker for Windows version 3.00.66. This is because it was created with NodeBuilder version

3.1 and contains an XIF ﬁle in format version 4. The problem is manifested as network variables having the wrong direction – outputs appear as inputs. The problem can be corrected by replacing a ﬁle in the network management tool with a new version. This ﬁle is “C:\LonWorks\bin\XIF32Bin.exe”. Echelon has granted permission for this ﬁle to be copied freely. A copy of this ﬁle can be obtained from Honeywell Analytics on request.

Midas® Gas Detector

Midas Technical Handbook

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Midas® Gas Detector

11 Troubleshooting and

Fault Diagnosis

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11-1

Midas® Gas Detector

11 Troubleshooting and Fault Diagnosis

General trouble shooting guide and speciﬁc fault code table for Midas® with Version 1.08 or lower software.

Table 11-1� Fault code descriptions�

Fault code

m9

m10

m11

m12

m13

m14

m15

m16

m17

F39

F40

F41

F42

F43

F44

F45

F46

F47

F48

F49

F80

F81

Description Condition Recovery

Simulated maintenance fault User has generated a simulated fault. Reset simulated fault.

Over range. A large concentration has been detected. The

User calibration expired. The user specified calibration interval has elapsed. Perform zero and span calibrations. Increase span calibration period.

Cartridge expires soon. Cartridge is old and will expire soon. Replace the cartridge with a new cartridge.

Flow error. Midas® is no longer able to regulate flow (high or

Interferent present. An interferent is degrading the ability of the Midas®

Temperature near limit. Temperature within 2 Celsius of limit. Check installation environment.

Baseline fault. Sensor baseline has drifted. Check for background gas concentration, temperature or humidity fluctuations.

Inhibit timeout. Transmitter has been in inhibit mode too long. Resume monitoring or increase timeout value.

Simulated fault User has generated a simulated fault. Reset simulated fault.

Sensor overdosed. Sensor has been exposed to high gas

Baseline fault. Sensor baseline has drifted. Check for background gas concentration, temperature or humidity fluctuations.

Calibration expired. Too long since last calibration. Replace or calibrate the cartridge.

Cartridge expired. Cartridge is too old. Replace cartridge.

Cell failure. Cartridge has failed Reflex™ check. Replace cartridge.

Stabilization timeout. Cartridge has failed to stabilize. If temperature or humidity shocks exist, precondition the car tridge. Check for

Cartridge analog failure. Electronic Failure or gas concentration greater than

Cartridge memory invalid. Checksum error. Replace cartridge.

Cartridge absent. No communications. Reseat cartridge. Replace car tridge.

Cartridge wrong type. Cartridge type found to be incorrect after boot-up. Replace cartridge or press ‘3’ accept if correct.

Temperature limits exceeded. Temperature is outside limits Check installation environment.

Flow fail. Flow < 70% of nominal for 15 seconds. Check filters. Check for kinked tubing, Replace pump.

Midas® requires an independent confirmation that the gas hazard is gone.

low flow condition).

to detect gas.

concentrations for long periods.

full scale.

Supply known clean air to the Midas® and clear this fault.

Check filters and pump.

Check pressure at inlet and outlet and assure they are within specification.

(See Section 4.3 Sample and exhaust tubing calculations)

Check application.

Perform zero calibration. Replace cartridge.

Replace cartridge.

Perform zero calibration. Replace cartridge.

background gas concentration. Replace car tridge.

Replace cartridge.

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Midas® Gas Detector

Fault code

F82

F83

F84

F86

F87

F88

F89

F90

F91

F92

Description Condition Recovery

Excessive electrical noise. Internal electronics repeatedly noisy. Check grounding of Midas® chassis. Check termination of cable shields.

Pyrolyzer fail. Pyrolyzer fails to heat. Check electrical connection to pyrolyzer. Replace pyrolyzer. (also see Section

Misc. transmitter fault. Transmitter is defective. Service or replace Midas®.

Coprocessor fail Coprocessor is damaged. Contact Honeywell Analytics Service.

Pyrolyzer temp limits exceeded

Pyrolyzer heater fail Pyrolyzer heater failed. Contact Honeywell Analytics Ser vice. Replace the pyrolyzer.

Pyrolyzer power unreg Target power not achieved within specified time

Pyrolyzer heater mismatch Different pyrolyzer type required Contact Honeywell Analytics Service.

HTP module required Check that MIDAS-S-CFX or MIDAS-E-CFX is

0P3 pyrolyzer module failure

Pyrolyzer temperature exceeded. Clean pyrolyzer cooling vents. Contact Honeywell Analytics Service.

span.

installed for the high temperature pyrolyzer version

Data value: 0x0800

0P3 pyrolyzer failed to get up to temperature

Data value: 0x1000

0P3 pyrolyzer flow is out-of-range

Data value: others

0P3 pyrolyzer internal failure

Relo

cate the Midas® further from noise sources. Add ferrite inductors to cables.

4.3)

If 24VDC power check, 21.6 < V in < 26.4 Contact Honeywell Analytics Service. Replace pyrolyzer.

Change to HT Pyrolyzer

Replace pyrolyzer heater

Check flow connections between Midas and 0P3 pyrolyzer

Contact Honeywell Analytics Service.

“Hot” and “Cool” messages are informational events that can be generated under two conditions:

1. Immediately after the detector powers up.

2. When the state changes from cool to hot or hot to cool.

“Hot” means the temperature inside the cartridge is at 40°C or above. “Cool” means the temperature inside the cartridge is below 40°C. In both cases the event data ﬁeld will list the actual temperature at the time of the event.

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Midas® Gas Detector

12 Reex

®

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12 REFLEX®

Midas® uses patented Honeywell Analytics technology to continuously monitor the health check status of

specic electrochemical cells and alert the user if a

cell enters a variety of fault conditions (such as open or short circuit etc.) which would leave the cell unable to detect gas and raise an appropriate alarm signal.

REFLEX® overcomes this unseen failure mode by applying periodically a special electronic pulse to the cell and reviewing the ‘echo’ from the cell as it responds to the applied signal. If the cell is deteriorating within certain pre-set limits based on the received signals then Midas® will decrease the REFLEX® sampling interval in order to establish the actual viability of the cell. Within a relatively short time, Midas® will be able to alert the user via fault codes that the electrochemical cell is likely to be requiring replacement and is possibly unable to correctly detect gas.

Midas® Gas Detector

REFLEX® is not required for pellistors or oxygen electrochemical cells as these sensor cartridges provide alternative electronic means to indicate open circuits and other sensor cartridge damage issues.

Midas Technical Handbook

12-2

Midas® Gas Detector

13 Internal Web Server

Midas Technical Handbook

13-1

Midas® Gas Detector

13 Internal Web Server

The Midas® gas detector unit utilizes an Ethernet port with the TCP/IP protocol as standard. The Midas® can function as a HTML web page server and these web pages can be viewed on external computer equipment (PC, PocketPC etc.) by using a standard software program, i.e.; Microsoft Internet Explorer. These web pages replicate the user interface on the front panel of the Midas® in a more ﬂexible and friendly format for diagnostic and data entry purposes. The web pages also contain additional features not available via the keypad.

This procedure explains how to view web pages for a single Midas® which is connected to a single PC only. Of course it is possible to connect hundreds of Midas® units to an Ethernet network. More information may be required from the local IT department and Honeywell Analytics as appropriate.

13�1 Physical Network Components

The Ethernet 100BaseT physical network is intended to connect computers to other computers through hubs. For this reason, a Midas® cannot communicate directly with a PC using a standard cable. This problem can be overcome by using a special “cross-over” Ethernet cable or by using a ‘hub’ or ‘switch’ and two standard (straight through wire connections) Ethernet cables. An example of a cross-over cable is the Belkin A3X126 family. An example of an Ethernet switch is the Linksys SD205.

server, the addresses must be set manually. To view or set the IP address of the Midas®, see Section 7.2.6. The procedure for setting the IP address of a PC is detailed in the following example using a PC loaded with Microsoft™ Windows XP and Internet Explorer version 5.0 or higher as illustrated by Diagram 13-1. In the usual case the netmask for both computers should be set to 255.255.255.0. The most-signiﬁcant three bytes of the IP address must be identical and the least-signiﬁcant byte must be unique. For example, if the IP address of the Midas® was set to 169.254.60.47 (the factory default) then an appropriate IP address for the PC would be 169.254.60.42.

13�2 Internet Settings

Communications requires knowledge of the IP address and netmask of both the Midas® and the PC. Unless the Midas® is connected to a network with a DHCP

Midas Technical Handbook

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Midas® Gas Detector

Diagram 13-1� IP Address setting in Windows XP�

Midas Technical Handbook

13-3

Midas® Gas Detector

13�3 Running the Web Browser

Start Microsoft™ Internet Explorer or similar web browser. Set the URL to “http://xxx.xxx.xxx.xxx” where the “xxx” ﬁelds are replaced with the IP address of the Midas®. A screen similar to Diagram 13-2 should be displayed. The status and conﬁguration of the Midas® can be viewed and set by clicking on the appropriate links.

Diagram 13-2� Midas® Default web page�

On the Status web page, all faults and alarms are indicated as well as real-time concentration reading. A fault or alarm can be reset from within the web page by clicking the “Reset” button. If the fault condition is still present, the fault status will be indicated again on the web page. Information regarding alarm settings, calibration history and software version are all contained in the status web page.

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13-4

Diagram 13-3� Event History�

Midas® Gas Detector

All Midas® events including calibrations, faults, and alarms are data logged with a timestamp, description and category code. The events are color-coded to allow a quick overview of the type of event logged.

Color Event Type

Green Reset

Red Alarms

Yellow Fault

White Informational

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Event History will store approximately 400 events, overwriting the oldest with the newest data. 30 seconds of data is stored for each alarm event - 15 seconds before the event and 15 seconds after.

The “Send to Print”, will generate a printed version of the event log by page or the complete listing (see Diagram 13-5).

The “Details” button allows access to a graphical display of gas concentration versus time elapsed (see

Diagram 13-6).

Honeywell Midas Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual