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Quick Start Guide
MDA Scientific
Midas® Gas Detector
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1. Introduction
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 toxic, flammable and oxygen gas sensor cartridges are available that enable
detection of gases used or generated in the Semiconductor and other manufacturing
industries.
The Midas® gas detector (MIDAS-T-001) is comprised of 4 main parts: the main chassis, the
mounting bracket assembly, the sensor cartridge and the unit cover. Diagram 1 details the
Midas® general arrangement. Additionally there are optional Pyrolyzer modules required
for the detection of NF3 and PFCs and an optional LonWorks® interface is available.
This Quick Start Guide provides basic installation, setup and operation information for the
main detector unit. For more detailed information on other features and options, please
refer to the Midas® Operating Manual part number MIDAS-A-001.
Diagram 1. Midas® general arrangement exploded view
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Sensor Cartridge
Unit cover
Main chassis
Mounting
bracket
assembly
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2. Mounting Details
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
(0.158 in)
58.50mm
(2.3 in)
Note
When reproducing this diagram, be sure to check dimensional
accuracy before drilling.
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2. Mounting Details
(cont’d)
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.
Unscrew the thumbscrew located on the front panel.
Remove the cover by pulling it forwards off the main chassis. On new Midas®
units, 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
below)
Unscrew the two retaining screws located at the bottom front of the chassis.
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.
Using the drill template provided drill two holes 2.3 in (58.50mm) vertically apart
for 2 x round head M4 screws.
Partially screw the fixings into the mounting surface.
Place the mounting bracket assembly over the screws so they pass through the
mounting holes and then slide down to locate in the slots.
Tighten the screws to secure the mounting bracket assembly.
Diagram 3. Mechanical installation
Removing cover
mounting
bracket
chassis
cover
loosen
IMPORTANT NOTICE !
Remove internal
shipping protection from
the pump module brfore
installation
Internal packing card
Remove before use.
Chassis Retaining Screws
1.
2.
3.
4.
5.
6.
7.
8.
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2. Mounting Details
(cont’d)
Removing chassis
mounting
bracket
chassis
IMPORTANT NOTICE !
Remove internal
shipping protection from
the pump module brfore
installation
mounting bracket
screws
DIN Rail Bracket
(MIDAS-A-036)
Spacer Bracket
2x M4 Screws
Secures Midas® to Spacer Bracket
4x M3 Screws
Secures DIN Rail Bracke
t
to Spacer Bracket
Attaching Bracket with
screws on a at surface
Optional DIN Rail
Mounting
Internal packing card
Remove before use.
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3. 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.
Diagram 4. Simplified Schematic Diagram 5. Wiring Diagram
4-20mA
Analog Output
Terminals
Relay
NO/NC
Jumpers
Relay Contact
Terminals
Power Switch
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.
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.
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4. Retting the Main Chassis
The main chassis can be refitted to the mounting bracket assembly using the following
steps.
Align the PCB at the top rear of the main chassis with the connector located at
the top of the mounting bracket assembly
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.
Slide the chassis backwards on the mounting bracket assembly so that the
PCB and connector and tubes engage simultaneously. (See diagram below).
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).
Align the two fixing screws located at the bottom of the chassis with the screw
threads on the mounting bracket assembly.
Tighten the screws to secure the chassis to the mounting bracket assembly.
Diagram 5. Refitting the chassis.
PCB
CONNECTOR
TUBES
1.
2.
3.
4.
5.
6.
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5. Installing the Sensor Cartridge
The Midas® sensor cartridge is supplied separately and needs to be fitted to the
detector’s main chassis. The following steps and diagrams detail the procedure for
installing the sensor cartridge for the first time. This procedure is carried out with the
power off and the detector cover removed.
Verify the part number and type of sensor cartridge is correct for your
application, then remove sensor cartridge from packaging.
Remove cap from cartridge.
Add label for secondary gases (if necessary).
Align pins at the top of the sensor cartridge with the socket in the sensor
cartridge chamber.
Carefully push the sensor cartridge into the sensor cartridge chamber until fully
seated.
Lock the sensor cartridge in place using the tabs on either side of the sensor
cartridge to secure the cartridge to the main chassis.
Switch the power switch on the terminal module to the ‘on’ position.
Reattach the detector cover by aligning the slots on either side with the locating
tabs on the mounting bracket assembly.
Push the cover horizontally until fully seated.
Tighten the thumbscrew on the front panel.
Diagram 6. Installing the sensor cartridge
Note:
In a rst-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’ button for a few seconds.
To properly activate the Midas® with a cartridge for the rst time:
When “ChAngE gAS” or “FIrSt CELL” scrolls on the display, hit the ‘✓’ on the Midas® front
panel.
When the “reboot” completes then press and hold the “X” to clear any latched fault(s).
Conrm that the green LED is ashing.
Conrm that the yellow and red LEDs are off.
Conrm the display shows a concentration of zero (as appropriate).
The cartridge has now been accepted by the Midas® as the correct type.
If the above steps were not performed at initial start-up, then remove the cartridge and cycle power. Once the
Midas® has completed the “reboot” process, install the cartridge to be used and repeat the steps above.
1.
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How cartridge is fitted
chassis
cartridge
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slots
tighten
How cover is fitted
tabs
cartridge fitted
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Fault
Code
Description Condition Recovery
m9 Simulated Maintenance Fault User has generated a simulated fault. Reset simulated fault.
m10 Over range.
A large concentration has been detected.
The Midas® requires an independent confirmation that
the gas hazard is gone.
Supply known clean air to the Midas® and clear this fault.
m11 User calibration expired The user specified calibration interval has elapsed. Perform zero and span calibrations. Increase span calibration period.
m12 Cartridge expires soon. Cartridge is old and will expire soon. Replace the cartridge with a new cartridge.
m13 Flow low. Midas® is no longer able to regulate flow. Check filters and pump.
m14 Interferent present.
An interferent is degrading the ability of the Midas®
to detect gas.
Check application.
m15 Temperature near limit. Temperature within 2° Celsius of limit. Check installation environment.
m16 Baseline fault. Sensor baseline has drifted.
Check for background gas concentration, temperature or humidity
fluctuations.
Perform zero calibration.
Replace cartridge.
m17 Inhibit timeout. Transmitter has been in inhibit mode too long. Resume monitoring or increase timeout value.
F39 Simulated Fault User has generated a simulated fault. Reset simulated fault.
F40 Sensor overdosed.
Sensor has been exposed to high gas concentrations
for long periods.
Replace cartridge.
F41 Baseline fault. Sensor baseline has drifted.
Check for background gas concentration, temperature or humidity
fluctuations.
Perform zero calibration.
Replace cartridge
F42 Calibration expired. Too long since last calibration. Replace or calibrate the car tridge.
F43 Cartridge expired. Cartridge is too old. Replace cartridge.
F44 Cell failure. Cartridge has failed Reflex™ check. Replace cartridge.
F45 Stabilization timeout. Cartridge has failed to stabilize.
If temperature or humidity shocks exist, precondition the cartridge.
Check for background gas concentration.
Replace cartridge.
F46 Cartridge analog failure.
Electronic Failure
Gas concentration greater than full scale.
Replace cartridge.
F47 Cartridge memory invalid. Checksum error. Replace cartridge.
F48 Cartridge absent. No communications.
Reseat cartridge.
Replace cartridge.
F49 Cartridge wrong type. Cartridge type found to be incorrect after boot-up.
Replace cartridge or press ‘✓’ accept if correct.
F80 Temperature limits exceeded. Temperature is outside limits Check installation environment.
F81 Flow fail. Flow < 70% of nominal for 15 seconds.
Check filters.
Check for kinked tubing.
Replace pump.
F82 Excessive electrical noise. Internal electronics repeatedly noisy.
Check grounding of Midas® chassis.
Check termination of cable shields.
Relo
cate the Midas® further from noise sources.
Add ferrite inductors to cables.
F83 Pyrolyzer fail. Pyrolyzer fails to heat.
Check electrical connection to pyrolyzer.
Replace pyrolyzer.
F84 Misc. transmitter fault. Transmitter is defective. Service or replace Midas®.
F86 Coprocessor fail Coprocessor is damaged. Contact Honeywell Analytics Service.
F87
Pyrolyzer temp limits
exceeded
Pyrolyzer temperature exceeded.
Clean pyrolyzer cooling vents.
Contact Honeywell Analytics Service.
6. Diagnostics
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Fault
Code
Description Condition Recovery
F88 Pyrolyzer heater fail Pyrolyzer heater failed.
Replace the pyrolyzer.
Contact Honeywell Analytics Service.
F89 Pyrolyzer power unreg Target power not achieved within specified time span.
If 24VDC power check, 21.6 < V in < 26.4
Contact Honeywell Analytics Service.
Replace pyrolyzer.
F90 Pyrolyzer heater mismatch
Requires High Temperature Pyrolyzer
(MIDAS-A-HTP)
Contact Honeywell Analytics Service.
F91 HTP module required
Check that MIDAS-S-CFX or MIDAS-E-CFX is
installed for the high temperature pyrolyzer version
Change to HT Pyrolyzer
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www.honeywell.com
MIDAS-A-020 Rev 2.0
April 2006
© 2006 Honeywell Analytics
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