MDA Scientific midas User manual

1
TOXIC, FLAMMABLE
AND OXYGEN GAS DETECTOR
OPERATING INSTRUCTIONS

2
TABLE OF CONTENTS
1 Table of contents 2
2 General description 5
3 Product overview 5
3.1 Main chassis 6
3.1.1 Display module 6
3.1.2 Pump module 7
3.1.3 Sensor cartridge chamber 7
3.2 Mounting bracket assembly 7
3.2.1 Mounting bracket 7
3.2.2 Terminal module 7
3.3 Sensor cartridge 8
3.3.1 Biased sensor cartridges 8
3.4 Cover 8
4 Default configuration 9
5 Installation 9
5.1 Mounting and location of detector 10
5.2 Mechanical installation 11
5.3 Sample and exhaust tubing calculations 12
5.4 In-line filters 13
5.5 Local detector option 14
5.6 Electrical installation 15
5.7 Electrical connections 17
5.8 Refitting the main chassis 18
5.9 Installing the sensor cartridge 19
6 Detector start up procedures 19
7 General operation 21
7.1 Normal operation mode 21
7.1.1 Resetting alarms, faults and maintenance faults 22
7.2 Review mode 22
7.2.1 Review mode menu overview 23
7.3 Overview of set-up, calibration and test mode 24
7.3.1 Set-up menu overview 24
7.3.2 Calibration menu overview ‘ CAL’ 26
7.3.3 Test menu overview ‘ tESt’ 27
8 Detailed procedures for navigating review,
set-up, calibration and test mode submenus 28
8.1 Review mode 28
8.1.1 Review software ‘SW’ 28
8.1.2 Review alarms ‘ ALm’ 29
8.1.3 Review faults ‘ FLt’ 29
8.1.4 Review calibration ‘ CAL’ 29
8.1.5 Review date and time ‘timE’ 29
8.1.6 Review detector address ‘ nEt’ 30
8.1.7 Review event log ‘ Hi St’ 30
© 2004 Zellweger Analytics Issue 1 12/2004 MIDAS-A-001

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8.2 Set-up, calibration and test modes 30
8.2.1 Set-up menu ‘ SEt’ 31
8.2.2 Set alarms ‘ ALm’ 31
8.2.3 Set faults ‘ FLt’ 34
8.2.4 Set calibration interval ‘ CAL’ 34
8.2.5 Set date and time ‘timE’ 35
8.2.6 Set address ‘ nEt’ 35
8.2.7 Set pass code ‘ PWd’ 36
8.3 Calibration menu ‘ CAL’ 36
8.3.1 Zero calibration ‘ 0CAL’ 36
8.3.2 Span calibration ‘ SPAn’ 37
8.3.3 Flow calibration ‘ FLoW’ 38
8.3.4 mA calibration ‘mA 4-20’ 38
8.4 Test menu ‘ tESt’ 39
8.4.1 Bump test ‘ bUmP’ 39
8.4.2 Alarm/fault test ‘ Si m’ 39
8.4.3 Inhibit state ‘ I nH’ 40
9 Routine maintenance 41
9.1 Sensor Cartridge Replacement 41
9.1.1 Sensor cartridge fitting/replacement 41
9.2 Pump replacement 43
9.3 Re-assembling the detector 46
9.4 Filter replacement 46
10 Pyrolyzer module option 47
10.1 Fitting the pyrolyzer module 48
10.2 Re-assembling the MIDAS® detector 49
11 Analog module 51
11.1 Fitting the analog module 51
11.2 Re-assembling the MIDAS® detector 52
12 Trouble shooting and fault diagnosis 53
13 REFLEX® 54
14 Internal web server 54
14.1 Physical network components 54
14.2 Internet settings 54
14.3 Running the web browser 54
15 Typical installation topologies 56
15.1 Conventional installation 57
15.2 Modbus/TCP installation 57
15.3 Power over Ethernet (PoE) installation 57
16 Ordering information 58
16.1 MIDAS® transmitter 58
16.2 MIDAS® pyrolyzer 58
16.3 MIDAS® analog input module 58

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16.4 MIDAS® plug in sensor cartridges (standard warranty) 59
16.5 MIDAS® plug in sensor cartridges (extended warranty) 60
16.6 MIDAS® complete gas detector kits 61
16.7 Accessories and spares 61
17 General specifications 62
18 Calibration and bump testing 63
19 Warranty statement 67
20 Software menu state charts 69
20.1 Top level 69
20.2 Review mode 70
20.3 Review software info, alarm, fault and gas calibration 71
20.4 Review date/time and network 72
20.5 Review event log 73
20.6 Set-up mode 74
20.7 Set-up alarm, fault and gas calibration 75
20.8 Set-up date/time and network 76
20.9 Set-up pass code 77
20.10 Calibration mode 78
20.11 Calibration gas zero and span 79
20.12 Calibration - Flow calibration 80
20.13 Calibration - 4-20 mA 81
20.14 Test mode 82
20.15 Test bump, alarm/fault simulation 83
20.16 Test inhibit 84
21 Contact details 85

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2 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 toxic, flammable
and oxygen gas sensor cartridges are available that enable detection of gases used or generated in the
Semiconductor and other manufacturing 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, 0-22 mA analog output, Modbus/TCP outputs for signal and service connectivity as well as the innovative
Power over Ethernet (PoE) protocol that enables a single Ethernet connection to be made for all power, control
and communication requirements.
3 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 1 details the MIDAS® general arrangement. Additionally, there is an
optional Pyrolyzer module required for the detection of NF3 and an optional Analog module for the connection of
external 4-20 mA devices. Please refer to section 10 and 11 respectively for details of these options.
Main chassis
Unit cover
Sensor cartridge
Mounting
bracket
assembly
Diagram 1. MIDAS® general arrangement exploded view

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1
2
1
31 5
1
41
6
1
7
1
8
1
21
1
20
1
9
1
10
1
11
1
12
1
13
1
14
1
15
1
16
1
17
1
19
1
18
1
1
3.1 Main Chassis
The main chassis comprises of the display module, pump assembly, and plug in sensor cartridge chamber.
Diagram 2. Main chassis
Pump module Display module
Sensor cartridge chamber
3.1.1 Display module
The display module 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 ‘▲’ up, ‘▼’ down, ‘✓’ accept and ‘X’
cancel buttons.
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. Address icon
14. Network icon
15. Inhibit icon
16. Fault icon
17. Up button
18. Alarm level 1 icon ▲
Alarm level 2 icon
(For flammable and toxic)
O
2
deficiency alarm icon ▼
O
2
excess alarm icon ▲
19. Cancel button
20. Zero and Span
calibration icons
21. Flow indicator
Diagram 3. MIDAS
®
display module layout

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3.1.2 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 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 9.2 and 9.4 respectively.
3.1.3 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. For details of fitting sensor cartridge refer to section 5.9.
3.2 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 communications socket.
Diagram 4. Mounting bracket assembly
Mounting bracket Terminal module
Cable entry
Gas inlet port
Ethernet/PoE socket
Gas outlet port
3.2.1 Mounting Bracket
The metal mounting bracket has two slots that allow the detector to be easily mounted to a wall using two
suitable screw fixings. For further details of mounting the detector refer to section 5.
3.2.2 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.

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3.3 Sensor Cartridge
A wide range of toxic, flammable or 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.
Diagram 5. Sensor cartridge
Front Back
Connector
Locking tabs
3.3.1 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. Bias cells are supplied for TEOS, NO and
O3. The bias circuit is removed just before insertion into the MIDAS® system and the sensor cartridge is thus ready
for effective gas detection.
Should a bias voltage not be applied (e.g. during a power failure) then 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.
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, battery back ups etc. are used.
NOTE: Sensor warranty is void if the sensor cartridge is opened by unauthorized user.
3.4 Cover
The 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.
Diagram 6. MIDAS® cover
LED windows
LCD window
Push buttons
Sensor cartridge
viewing window
Thumbscrew

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4 DEFAULT CONFIGURATION
Current source with:
0 mA
Fault (open circuit)
1.0 mA
Fault
3.0 mA
Maintenance Fault
4.0 to 20.0 mA
Gas reading (normal operation)
2.0 mA
Inhibit (test mode)
21.0 mA Over range
Toxic Gas Flammable Gas Oxygen
Full Scale (FS) Typically 4 x Toxic
Threshold Limit (TLV)
100% Lower Explosive
Limit (LEL) 125% Volume (v/v)
Lowest Alarm Level
(LAL) Typically 1/2 TLV 10% LEL 5% v/v
Lower Detectable
Limit (LDL)
Typically 0.4 TLV 9% LEL 0% v/v
The LDL is the minimum level that is reliably distinguishable from zero.
Alarm Relay 1
Alarm level 1 of 1/2 TLV 10% LEL 23.5% v/v (Rising)
Normally de-energized, energizes on alarm.
Contact Normally Open (NO), closes on alarm.
Alarm Relay 2
Alarm level 2 of TLV 20% LEL 19.5% v/v (Falling)
Normally de-energized, energizes on alarm.
Contact Normally Open (NO), closes on alarm.
Fault Relay Normally energized, de-energizes on fault.
Contact Normally Open (NO).
Latching Non latching. Alarm and fault relays automatically reset when reading falls
below alarm thresholds or fault clears.
Pass code No pass code set.
As standard, the MIDAS® gas detector is factory configured as below:
Table 1. MIDAS® default configuration
1 MIDAS® detectors are not ETL approved for monitoring in or sampling from classified areas above 25% LEL
5 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 recognised standards of the appropriate authority in the country concerned. Prior to
carrying out any installation ensure local regulations and site procedures are followed.

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5.1 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.
Nitrogen Trifluoride
NF3
FS: 4-40 PPM
PN: MIDAS-X-HFX
SN: 2564-0243
Expires: Nov2006
zellweger analytics
z
zellweger analytics
z
GAS DETECTOR
midas
5.91 [150.00]
4.72 [120.00]
2.48 [63.00]
Diagram 7. MIDAS® outline dimensions
Drill Template
Drill 2 x
M4 holes 58.50mm
(2.3”)

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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 fixings appropriate for the surface being mounted to.
4. Ensure the head size of fixings used will not snag the terminal PCB.
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.
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.
5.2 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.
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
forwards 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.
Diagram 8. Mechanical installation

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5.3 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.
Table 2. Inlet sample specifications
Inlet Sample Specifications:
Maximum
Tubing Length, m (ft) 30 (100) 20 (66) 10 (33) 0
Transport Time (sec) 28 19 10 1
Sample Point
Vacuum
(Negative pressure)
-25.4 cm H2O (-10 in H2O) Maximum
Flow rate, cc/min. 500 (Flow is constant) 1
Tubing OD, mm (in) 6.35 (0.25)
Tubing ID, mm (in) 3.18 (0.125)
1 NOTE: The flow rate is electronically maintained at 500 cc/min
Table 3. Outlet sample specifications
Outlet Sample Specifications:
Maximum
Tubing Length, m (ft) 30 (100) 20 (66) 10 (33) 0
Back Pressure
at Exhaust Point
(Excluding tubing)
20.3 cm H2O (8 in H2O) Maximum
Tubing OD, mm (in) 6.35 (0.25)
Diagram 8. Mechanical installation
ATTACHING BRACKET TO
SCREWS ON A WALL
mounting
bracket
screws

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5.4 In-line filters
External filters must be used to protect the tubing from contamination. Use particulate filter part number
0780248 for normal gases and 1830-0055 for corrosive gases. Replace the filter every 3 months. Refer to
the table below for specific gases.
Target Gas
Recommended
maximum sample
line (m)
End of line
particulate filter
(P/N 0780248)
End of line
particulate
Teflon filter
(1830-0055)
Ammonia 10 YES **
Arsine 30 YES **
Boron Trichloride 5* NO YES
Boron Trifluoride 5* NO YES
Bromine 10 NO YES
Carbon Dioxide 30 YES **
Carbon Monoxide 30 YES **
Chlorine 10 NO YES
Chlorine Dioxide 10 NO YES
Chlorine Trifluoride 5* NO YES
Diborane 30 YES **
Dichlorosilane 5* NO YES
Disilane 10 YES **
Fluorine 10 NO YES
Germane 30 YES **
Hydrogen (% LEL) 30 YES **
Hydrogen (ppm) 30 YES **
Hydrogen Bromide 5* NO YES
Hydrogen Chloride 5* NO YES
Hydrogen Cyanide 10 YES **
Hydrogen Fluoride 5* NO YES
Hydrogen Selenide 30 YES **
Hydrogen Sulfide 30 YES **
Methane (% LEL) 30 YES **
Nitrogen Dioxide 30 NO YES
Nitrogen Oxide 30 YES **
Nitrogen Trifluoride 30 YES **
Oxygen Proficiency & Deficiency 30 YES **
Ozone 5 NO YES
Phosphine 30 YES **
Phosphorous Oxychloride 5* NO YES
Table 4. In-line filter recommendations

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Target Gas
Recommended
maximum sample
line (m)
End of line
particulate filter
(P/N 0780248)
End of line
particulate
Teflon filter
(1830-0055)
Silane 30 YES **
Silane (low level) 30 YES **
Sulfur Dioxide 30 NO YES
Sulfur Tetrafluoride 5* NO YES
Tetra Ethyl Ortho Silicate 30 YES **
Tungsten Hexafluoride 5* NO YES
5.5 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 for corrosive gases. The area around the detector is then being monitored
as opposed to a sample being drawn from a remote location.
Diagram 9. Local gas detector option
MIDAS-T-001 transmitter installed with
in line particulate filter for local ambient
monitoring mode
* Recommend to keep the sample lines as short as possible where the RH condition at the sample point is high (above
<50%RH); there will be some sample loss due to absorption onto the sample line.
** These gases can use either filter.
Table 4. In-line filter recommendations (cont.)

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5.6 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.
Diagram 10. Typical wire routing
ANALOG OUTPUT
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.
NOTE: When powered by Power over Ethernet (PoE) the 3 on board relays do not require separate 24 VDC
to be energized
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 11 shows the terminal module layout and terminal identification as well as the jumper locations.
Diagnostic LED lamps are positioned on the internal main chassis for ease of viewing. These indicate that
Ethernet communication activity is active. In some versions of MIDAS® the rear mounted Power over Ethernet port
has two LED status lamps; note that these are not utilized and do not illuminate.
24V DC
RELAYS
OUT
COM
EXT INT
ALM 1
ALM 2
FLT
24V DC IN
0V DC COM
CABLE GLAND
WIRES
RJ45 CONNECTOR

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Diagram 11. MIDAS® terminal layout and identification
See relay
function
table below
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
NOTE: EARTHING REQUIREMENTS
If the MIDAS® unit 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 affect the performance of your equipment.

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5.7 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 sinking, sourcing or isolated operation. Below are some schematic
diagrams of typical electrical connection configurations.
Diagram 14. Example MIDAS®
and 5704 connection
Diagram 15. Example MIDAS®
and 5701 connection
Diagram 16. Generic example
MIDAS® 4-wire isolated output
Diagram 17. Generic Example
MIDAS® 3-wire sourcing output
Diagram 12. Example MIDAS®
and Touchpoint 1 connection
Diagram 13. Example MIDAS®
and Touchpoint 1 connection

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Diagram 18. Generic example
MIDAS® 3-wire sinking output
5.8 Refitting 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
backwards on the mounting bracket assembly
(WARNING: DO NOT PUSH ON THE LCD AS THIS MAY CAUSE DAMAGE).
5. Align the two fixing 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 19. Refitting the chassis.
Diagram 19. Generic Example MIDAS®
sourcing 4-20 mA with PoE power
Diagram 20. Generic example
MIDAS® isolated 4-20 mA
output with PoE power

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5.9 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.
1. Remove sensor cartridge from packaging
2. Check the part number and type of sensor cartridge is correct.
3. Check the activate by date.
4. Align 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.
6. Lock the sensor cartridge in place using the tabs either side of the sensor cartridge to lock the sensor
cartridge to the main chassis.
7. Switch the power switch located 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.
Diagram 20. Installing the sensor cartridge
6 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 5.6 and 5.7.
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 7.
6. If using a multi gas sensor cartridge refer to section 8.2.2 to ensure the correct gas id code is selected.
7. Allow the detector to stabilize using the table over to determine the maximum sensor cartridge
warm up time.
midas
Gas Sensor Cartridge
NITROGEN TRIFLUORIDE
NF3
PN : MIDAS-S-HFX
SN : 0234456670
Use by : 07-09-2006
zellweger analytics
HOW CARTRIDGE IS FITTED
chassis
cartridge
midas
Gas Sensor Cartridge
NITROGEN TRIFLUORIDE
NF3
PN : MIDAS-S-HFX
SN : 0234456670
Use by : 07-09-2006
zellweger analytics
slots
tighten
HOW COVER IS FITTED
tabs
cartridge fitted

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Sensor
Cartridge
Family
Sensor
Cartridge
Part No.
Gas Name
Maximum
Warm-up
Time
(minute)
Ammonia MIDAS-S-NH3 Ammonia 10
Hydrides MIDAS-S-ASH Arsine 20
MIDAS-S-HYD Diborane, Germane 20
MIDAS-S-PH3 Phosphine 20
MIDAS-S-SHX Silane (20 ppm), Disilane 20
MIDAS-S-SHL Silane (2 ppm) 20
MIDAS-S-HSE Hydrogen Selenide 20
Mineral Acid (HF) MIDAS-S-HFX
Hydrogen Fluoride, Boron Trifluoride,
Nitrogen Trifluoride, Tungsten
Hexafluoride
20
MIDAS-S-SF4 Sulfur Tetrafluoride, Chlorine Trifluoride 20
Mineral Acid (HCl) MIDAS-S-HCL Hydrogen Chloride, Boron Trichloride,
Dichlorosilane, Hydrogen Bromide 20
MIDAS-S-POC Phosphorous Oxychloride 20
Halogens MIDAS-S-HAL Chlorine, Fluorine 10
MIDAS-S-BR2 Bromine, Chlorine Dioxide 20
Carbon Dioxide MIDAS-S-CO2 Carbon Dioxide 20
Carbon Monoxide MIDAS-S-COX Carbon Monoxide 10
Hydrogen MIDAS-S-H2X Hydrogen 10
Hydrogen Cyanide MIDAS-S-HCN Hydrogen Cyanide 10
Hydrogen Sulfide MIDAS-S-H2S Hydrogen Sulfide 10
Nitric Oxide MIDAS-S-NOX Nitric Oxide 10
Nitrogen Dioxide MIDAS-S-NO2 Nitrogen Dioxide 10
Oxygen MIDAS-S-O2X Oxygen 30
Ozone MIDAS-S-O3X Ozone 10
Sulfur Dioxide MIDAS-S-SO2 Sulfur Dioxide 10
TEOS MIDAS-S-TEO TEOS 10
Flammables MIDAS-S-LEL Hydrogen, Methane 30
Table 5. Sensor cartridge warm up times