Honeywell MIDAS-E-XHF User Manual

Midas Gas Detector

User Manual

• Table of Contents

• Description

• Overview

• Default Conﬁguration

• Installation

• Startup

• Operation

• Navigating Menus

• 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

i

1 Description �� 1-2 2 Overview �� 2-2

2�1 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 �� 3-2 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�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 Startup �� 5-2

Table of Contents

Midas® Gas Detector

ii

6 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 ............................................................................ 6-8

6.3.3 Test Menu Overview ..................................................................................... 6-10

7 Navigating Modes and Submenus �� 7-2

7�1 Review Mode �� 7-2

7.1.1 Review Software ............................................................................................ 7-2

7.1.2 Review Alarms ............................................................................................... 7-3

7.1.3 Review 4-20 mA Output ................................................................................. 7-3

7.1.4 Review Faults ................................................................................................. 7-3

7.1.5 Review Calibration .........................................................................................7-4

7.1.6 Review Date and Time ................................................................................... 7-4

7.1.7 Review Detector Address ............................................................................... 7-5

7.1.8 Review Event Log .......................................................................................... 7-5

7.1.9 Review LCD Backlight Mode .......................................................................... 7-6

7�2 Set-up, Calibration, and Test Modes �� 7-6

7.2.1 Set-up Menu ................................................................................................... 7-7

7.2.2 Set Alarms ..................................................................................................... 7-7

7.2.3 Set 4-20 mA output ........................................................................................ 7-9

7.2.4 Set Faults ....................................................................................................... 7-9

7.2.5 Set Calibration Interval ................................................................................. 7-10

7.2.6 Set Date and Time ....................................................................................... 7-10

7.2.7 Set Address .................................................................................................. 7-11

7.2.8 Set pass code .............................................................................................. 7-12

7.2.9 Set LCD Backlight mode ............................................................................... 7-13

7.2.10 Set Pump control frequency ........................................................................ 7-13

Midas® Gas Detector

iii

7�3 Calibration Menu �� 7-14

7.3.1 Zero Calibration ............................................................................................ 7-14

7.3.2 Span Calibration ........................................................................................... 7-15

7.3.3 Flow Calibration ........................................................................................... 7-17

7.3.4 mA Calibration .............................................................................................. 7-18

7�4 Test Menu �� 7-18

7.4.1 Bump Test .................................................................................................... 7-19

7.4.2 Alarm/Fault Test ........................................................................................... 7-19

7.4.3 Inhibit State .................................................................................................. 7-20

7.4.4 Stimulate 4-20mA ......................................................................................... 7-21

8 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 �� 8-6

8�4 Filter Replacement �� 8-6

8�5 System Leak Check Procedure �� 8-7 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 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

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

Midas® Gas Detector

iv

11 Troubleshooting and Fault Diagnosis �� 11-2 12 REFLEX �� 12-2 13 Internal Web Server �� 13-2

13�1 Physical Network Components �� 13-2

13�2 Internet Settings �� 13-2

13�3 Running the Web Browser �� 13-4 14 Typical Installation Topologies �� 14-2

14�1 Conventional Installation �� 14-2

14�2 Modbus/TCP Installation �� 14-3

14�3 Power over Ethernet (PoE) Installation �� 14-3 15 Ordering information �� 15-2

15�5 Midas Complete Gas Detector Kits �� 15-3

15�6 Accessories and Spares �� 15-4 16 Specifications �� 16-2 17 Calibration and Bump Testing �� 17-2 A Modbus/TCP Interface ��A-2

A.1 Reading Status from the Midas ........................................................................A-2

A.2 Sending Commands to the Midas .....................................................................A-6

A.3 Determining the MAC Address ..........................................................................A-7

B Gas Tables ��B-2 C Warranty ��C-2

Sensor Cartridge Warranty ��C-3

Pyrolyzer Warranty ��C-3

Midas® Gas Detector

v

This symbol indicates that the product must not be disposed of as general industrial or domestic waste. This product should be disposed of through suitable WEEE disposal facilities. For more information about disposal of this product, contact your local authority, distributor or the manufacturer.

EU Directive 2012/19/EU: Waste Electrical and Electronic Equipment (WEEE)

Midas® Gas Detector

1-1

1 Description

Midas® Gas Detector

1-2

1 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® Gas Detector

2-1

2 Overview

Midas® Gas Detector

2-2

2 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 NF

3

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 Chassis

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

Diagram 2-2. Main chassis

Display

Sensor cartridge chamber

Pump module

Service Port

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® Gas Detector

2-3

Diagram 2-3. Midas® display module layout

1

21

1

20

1

9

1

10

1

11

MDA Scientific Midas

1

2

1

3

1

5

1

4

1

6

1

7

1

8

1

12

1

13

1

14

1

15

1

16

1

17

1

19

1

18

2.1.2 Pump Module

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.

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

Ethernet/PoE socket

Gas outlet port

Gas inlet port

Terminal module

Mounting bracket

Cable entry

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 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

Midas® Gas Detector

2-4

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

REMOVE

AT TIME OF

INSTALLATION

Front Back

Connector

Locking tabs

Protective Cap

(remove before use)

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.

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.

Midas® Gas Detector

2-5

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

Sensor Cartridge

viewing window

Thumbscrew

Ventilated Pyrolyzer Cover

Midas® Gas Detector

3-1

3 Default Conﬁguration

Midas® Gas Detector

3-2

3 Default Conﬁguration

NOTE: Oxygen levels are 20.9% v/v in a normal atmosphere, equivalent to 17.3 mA. Use caution when

integrating an oxygen Midas unit using the 4-20 mA output since fault, inhibit, and no power conditions are below 4 mA and, by default, an oxygen depletion alarm is triggered on a falling alarm (default 19.5% v/v). In that case, Honeywell Analytics recommends one of the following:

• Use Modbus TCP digital communications

• Use discrete relay inputs instead of a 4-20 mA signal to trigger gas alarms

• Program the control system of the 4-20 mA input with logic and a delay (e.g., 1 second) before triggering an alarm to determine if the 4-20 mA output is at one of the 0-4 mA conditions described above.

Contact Honeywell Analytics for further information.

The Midas® gas detector is factory-conﬁgured as described in Table 3-1 on the following page.

Midas® Gas Detector

3-3

Table 3-1. Midas® default conguration

Current source with:

1.0 mA Fault

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

Full Scale (FS)

Typically 4 x Threshold Limit

Value (TLV)

100% Lower Explosive Limit

(LEL)

1

25% Volume (v/v)

Lowest Alarm Level (LAL)

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

Alarm 1

(Relay 1)

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

Normally de-energized, energizes on alarm.

Contact Normally Open (NO), closes on alarm.

Alarm 2

(Relay 2)

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

Normally de-energized, energizes on alarm.

Contact Normally Open (NO), closes on alarm.

Fault

(Relay 3)

Normally energized, de-energizes on fault.

Contact Normally Open (NO). Instrument Fault Only

Latching

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

thresholds. Relays MUST be manually reset.

Pass code

No pass code set.

IP Address

169.254.60.47 subnet mask 255.255.255.0

1

Midas

®

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

See Table 7-3 for more information on Relay Conﬁguration

Midas® Gas Detector

4-1

4 Installation

Midas® Gas Detector

4-2

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 ﬁtting 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

zellweger analytics

z

GAS DETECTOR

5.91 in [150.00mm]

4.72 in [120.00mm]

2.48 in [63.00]

honeywell

MDA Scientific Midas

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

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)

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

4-3

7.9 in (201 mm)

6.0 in (152 mm)

3.2 in

(81 mm)

2.5 in (62 mm)

3.2 in

(83 mm)

Midas® Transmitters and Pyrolyzers

4.0 in. (101 mm)

8.2 in.

(209 mm)

5.5 in.

(140 mm)

4.4 in. (113 mm)

9.1 in. (233 mm)

2.3 in. (59 mm)

MIDAS-T-HTP

Note: Heat shield not present on all pyrolyzers.

3.9 in. (205 mm)

3.9 in.

(98 mm)

2.4 in. (60 mm)

5.2 in.

(132 mm)

9.6 in.

(244 mm)

Midas-T-00P

MIDAS-A-

103

honeywell

MDA Scientific Midas

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

MIDAS-T-0P3

MIDAS-A-039

MIDAS-T-NP1

LQ PP

LQ PP

LQ PP

LQ PP

LQ PP

Midas® Gas Detector

4-4

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® Gas Detector

4-5

Diagram 4-2. Mechanical installation

Removing cover

mounting bracket

chassis

cover

loosen

IMPORTANT NOTICE !

Remove internal

shipping protection from the pump module brf

ore

installation

Removing chassis

mounting bracket

chassis

IMPORTANT NOTICE !

Remove internal

shipping protection from the pump module brf

ore

installation

Internal packing card

Remove before use.

Internal packing card

Remove before use.

Chassis Mounting Screws

Midas® Gas Detector

4-6

DIN Rail Bracket

Spacer Bracket

2x M4 Screws Secures Midas

®

to

Spacer Bracket

4x M3 Screws Secures DIN Rail to Spacer Bracket

Optional Midas® DIN Rail Mount

Optional Midas

®

Pyrolyzer Adjustable “L” Bracket Mount

Optional Midas® Adjustable “L” Bracket Mount

mounting bracket

screws

Standard Midas® Wall Mount

Diagram 4-3. Mechanical installation

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.

Top Access Tubing Connector

(MIDAS-A-031)

honeywell

MDA Scientific Midas

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

Midas® Gas Detector

4-7

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)

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

Transport Time (sec), ID 1/8”

1

28 19 10 1

Transport Time (sec), ID 3/16”

63 43 23 1

Sample Point Vacuum (Negative pressure)

-25.4 cm H2O (-10 in H2O) Maximum

Flow rate, cc/min.

500 (Flow is constant)

2

Tubing OD, mm (in)

6.35 (0.25)

Tubing ID, mm (in)

3.18 (0.125)

1

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

for best speed of response. Due to its lower surface area, thickwall tubing may require less conditioning than thin-wall tubing.

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:

Maximum

Tubing Length, m (ft)

30 (100)

Back Pressure at Exhaust Point (Excluding tubing)

20.3 cm H2O (8 in H2O) Maximum

Tubing OD, mm (in)

6.35 (0.25)

Tubing ID, mm (in)

4.76 (0.188)

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 inﬂuences thus resulting in an F81 Flow Fault.

External Flow Fluctuation Fault 81 Explanation

1

Low (0-150 cc/min)

None No Midas® will auto-adjust

2

Low (0-150 cc/min)

Yes

(up to 100 cc/

min ﬂow swings)

Likely

Midas® changes the flow gradually. If external flow changes are large and rapid, the final reading will be different from what Midas

®

expected. Midas® will issue Fault 81.

3

Medium (~200-450 cc/ min)

Yes and No Yes

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

4

High (> 600 cc/min)

Yes and No Yes

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

Midas® Gas Detector

4-8

4.4 In-line Filters

External filters must be used to protect the tubing from contamination. Use particulate ﬁlter 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 speciﬁc 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 ﬁlter is simply connected to the sensor cartridge gas inlet port. The external dust ﬁlter 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

MIDAS-T-001 transmitter installed with in line particulate

lter for local ambient monitoring

mode

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 NO/NC Jumpers

Relay Contact Terminals

Cable Gland

Ethernet Cable

Power Switch

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.

honeywell

MDA Scientific Midas

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

Midas® Gas Detector

4-9

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 identiﬁcation 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.

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 aect the performance

of your equipment

Midas® Gas Detector

4-10

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

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

}

See Relay

function

table below

Relays

are user

congurable

Note

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.)

Display Description Relay 1 Relay 2 Relay 3

1FLt

Instrument Fault

Only

Alarm 1 Alarm 2

Instrument

Fault

2Flt

Separate Fault

Relays

Any Alarm

Maintenance

Fault

Instrument

Fault

CmbF

Combined Fault

Relay

Alarm 1 Alarm 2 Any Fault

nEtr

Remote control of

relays via Modbus/

TCP or LonWorks

®

Relays respond to Modbus or

LonWorks® holding registers only.

Midas® Gas Detector

4-11

Diagram 4-7. Generic Example

Midas® 4-Wire Isolated Output

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

Diagram 4-8. Generic Example

Midas® 3-Wire Sourcing

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

Diagram 4-9. Generic Example Midas® 3-Wire Sinking Output

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

Diagram 4-10. Generic Example

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

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 conﬁgured for fully isolated operation. With 24 VDC power the 4-20 mA output can be conﬁgured for sink, source or isolated output operations. Below are some schematic diagrams of typical electrical connection

configurations. Specific wiring instructions for connecting a Midas to a Honeywell Analytics Sieger System-57TM are provided on pages 4-12 to 4-16. Speciﬁc instructions for connection to a Honeywell Analytics TouchPointTM are provided on pages 4-17 and 4-18 and the HA71 on pages 4-19 and 4-20.

Note:

When wiring the Midas Transmitter to a

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

Midas® Gas Detector

4-12

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

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

-

35

36

29

28

+

24

VDC

-

Sense

Resistor

Cabinet

29

35

28

36

Shielded Cable

Isolated Loop

Supply

~40 mA max

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

}

Midas® Gas Detector

4-13

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® Gas Detector

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 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

Honeywell MIDAS-E-XHF User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual