Parker 023-037X Instructions for use

MICRO THERMO TECHNOLOGIES™
023-037X MT-IR Leak Detector
Specifications and Quick Install Guide
Document No. 70-PHW-1025-R0.6
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70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 1
MT-IR Refrigerant Leak Detector
Analog transmitters with
infrared sensors, specific
refrigerant leak detector
The MT-IR is a Non-Dispersive IR Refrigerant Gas Sensor and was designed to detect for
the presence of specific refrigerant gases within an enclosed space. The sensor is mounted
within the space to be monitored and connected by cable to an input board called MT500
board. Each sensor is calibrated to monitor for a specific refrigerant gas. There are two
models of IR sensor for each gas depending upon the monitoring environments: Machine
room, for most applications above freezing and Cold Room for low temperature refrigerated
room applications. The IR Sensor is a reliable method of monitoring for refrigerant gas leaks
in environments that have air quality problems. The IR sensor will eliminate many false
alarms in environments that contain gasoline, diesel, and propane exhaust and fumes from
solvents, paints, cleansers, and others.
Typical applications include:
HVAC Chiller Equipment Rooms
Refrigeration Mechanical Rooms
Food Processing Plants
Refrigerated Rooms

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 2
SENSOR TYPE
Non-dispersive infrared sensor, calibrated
to monitor for a specific refrigerant gas.
OPTIONAL REFRIGERANT GAS TYPE
GAS TYPE 0 to 43°C
Ammonia R717 (NH3)
R11
R12
R22 023-0375
R114
R123
R125 023-0376
R134A 023-0377
R401A (MP89)
R401B (MP66)
R402A (HP80) 023-0378
R404A (HP62) 023-0379
R407A
R407C (9000) 023-0373
R408A (FX10)
R409A (FX56)
R410A 023-0374
R500
R502
R507A (AZ50) 023-0380
INSTALLATION
Mount securely on a wall with little or no
vibration.
Install in vertical position only.
For refrigerants mount 18" to 24" from the
floor
For Ammonia mount on or near the ceiling
CALIBRATION
Zero adjustment recommended at six month
intervals
OPTIONAL RELAY
Remote SPDT Output1 set to 500ppm
Remote SPDT Output2 set to 1000ppm
SPECIFICATIONS
ENCLOSURE
Standard Black Painted
Aluminum
Size 12.9" x 4.8" x
2.5"
327 mm x 122 mm x 62 mm
Weight 2 pounds 900 grams
RANGE
0 - 1000 ppm
SENSITIVITY
+/- 1 ppm at 25°C (77°F), 45% RH
RESOLUTION
1 ppm
ACCURACY
+/- 5 ppm plus 2% over full scale
RESPONSE TIME
Under 60 seconds
OPERATING TEMPERATURE
Standard model
0 to 43°C (32 to 110°F)
Freezer Room model
-40 to 43°C (-40 to 110°F)
HUMIDITY
0 to 90% RH non condensing
CERTIFICATION
ETL
OUTPUT
Linear 4 to 20 mA signal
POWER & WIRING
12 to 32 Volts DC
Three conductor, 18 AWG
unshielded

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 3
MOUNTING INSTRUCTIONS

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 4
Sensor Placement.
The MT-IR Refrigerant Gas Sensor must be placed in locations that a refrigerant gas leak is likely to
occur and where leaked refrigerant gas is likely to concentrate so as to provide warning of a
potentially hazardous condition. Mounting locations are dependent upon the application and the
refrigerant gas to be monitored. The housing has a 3/4” conduit knockout hole in the bottom so the
sensor must be mounted vertically.
All mounting locations must be a fixed, well supported wall, pole or frame with little or no vibration.
Sensors must be placed in locations that will prevent damage from fork trucks, carts, and other
moveable devices.
For Halocarbon refrigerants, place the sensor 18 to 24 inches off the floor. For Ammonia (R717),
place the sensor 18 to 24 inches from the ceiling.
Use only watertight fittings, either conduit fittings or cable retention fittings. Mount conduit on the
bottom side of the housing to prevent moisture from dripping on the control board.
HVAC/Refrigeration Machinery Room
Prior to placement of the MT-IR Gas Sensors, the room air currents need to be determined. Air
currents can be determined through the use of smoke candles or any other accepted field-expedient
method. The air currents of every potential condition should be analyzed. The maximum air flow
rate past the sensor should not exceed 3 feet per second. Air velocity past the sensor can be
determined by lighting a match close to the sensor. If the match is blown out by the air current,
mounting the sensor inside a pull box with the knockouts opened slightly or some other method of
damping the air must be used.
Exhaust Fan On -- The air currents within the machinery room exhaust fan must be determined.
Identify locations that are "downwind" of the potential leak source. Locate one sensor near the air
intake duct of the exhaust fan, but not directly in the duct so the sensor is not subject to the full
force of the duct air.
Exhaust Fan Off -- In applications where the machinery room exhaust fan can be shut off, identify
air currents of the machine room with the fan off. Locate a position "downwind" of the potential
leak source with the fan off. This location may be omitted if the exhaust fan is to be operated
continuously.
Refrigerated Room
Determine the direction of the discharge air from the evaporator coil.
Halocarbon Refrigeration Systems -- Mount the sensor on a wall near the return air vents of the
evaporator coil or within between ten to twenty feet of a doorway exiting the room to a space. Also
18 to 24 inches above the finished floor. Use of a "J" box or some other form of protection for the
sensor may be necessary.
Ammonia Refrigeration Systems -- Mount the sensor on a wall in the downwind air path of the
discharge air, at least 20 feet or more from the coil or on the wall on the opposite side of the room.
18 to 24 inches from the ceiling. Do not place the sensor closer than 10 feet from the coil or directly
in the discharge air path to avoid temperature fluctuations due to defrost and violent air circulation.

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 5
Mounting
The sensor must be mounted with the wire terminal blocks oriented to the lower right and the
sampling chamber in a vertical position. Failure to mount the sensor in this fashion may result in
false or inaccurate readings and can allow water to enter the housing and destroy the sensor.
Wall Mount.
Use locally available wall mounting hardware, such as molly-bolts or toggle bolts, to firmly affix the
sensor to the wall. The sensor should be mounted using the mounting feet mounted on the back of
the housing. Ensure that all four sets of mounting feet are accessible. Hold down the mounting feet
with the locally available wall mounting hardware.
Pole Mounting.
The sensor can be mounted to a support pole by utilizing Uni-Strut type C braces. Attach the C-
braces to the back of the housing, perpendicular to the sensing chamber direction. Attach clamps to
the C-brace and run stainless steel band straps around the pole and through the straps.
Cable Runs.
All cabling must avoid running parallel to high voltage (48 VDC or greater or any AC voltage
wiring). Cable must be greater than 12 inches away from high voltage wiring or conduit. Avoid
running cable near any inductive load, such as motor, fluorescent fixture, transformer. Depending
upon local codes, sensor cabling may be run loose or be placed into conduit used exclusively for low
voltage control wiring.
Sensor cable shall have the minimum specifications:
-For cable runs of 0 to 1000 feet
18 AWG, 3 or 4 Stranded Wire.
.

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 6
SENSOR WIRING
Wire sensors according to diagram
Figure 6
The sensor can be powered
directly from the MT-500
board.
Don’t power more than one
sensor per MT500 board.
The 255 ohms resistor R should
be placed at the MT-500 input
terminal block.
Figure 7
RELAY OPTION
When relay output is needed use an external power supply 400-0002 set to 24VDC with a dual relay
sequencer 023-0386. Wire according to Figure 7. This configuration allows the IR sensor to be use
as stand alone or with the MT-500 sensor node. The 255 ohms resistor R should be placed at the
relay sequencer input terminal block. Do not connect the (–) wire of the 24VDC to the relay
sequencer. This will prevent ground loop to affect signal accuracy. Default relay threshold settings
are 500ppm and 1000ppm. Different setting is available on special order. Relay and power supply
should be installed in a control panel.
24Vac
20va
Transformer
24Vac in
DC output
Set to 24V
023-0386
400-0002
560-0027 023-037X, 0380
MT-IR
g
as senso
r
RLY1
500ppm
RLY2
1000ppm R
023-037X R-XYZ
Install date
Calib date
4
3
2
1
+
-
+
-
A
C
-
+
OPTIONAL
Sensor node
MT-500
Stand alone or monitoring with relay application
Power
Signal GND
GND
+15V
+
15V
Analog U
inputs
Red
Black
Yellow
Green
Not conn
023-037X, 0380
MT-IR
g
as senso
r
023-037X R-XYZ
Install date
Calib date
4
3
2
1
Sensor node
MT-500
Monitoring application
GND
GND
+15V
+
15V
Analog U
inputs
R
Black
Yellow
Red
P6

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 7
MT ALLIANCE INSTALLATION
1. In configuration mode pick a sensor object in the components box
2. Fill the form as follow: Select in this order the Gas Concentration Physical Type name, the
Micro Thermo Manufacturer and the 023-037X Sensor Model then click OK.
Note: If 023-037X sensor model is
not available use the 023-0280+
1000ppm model as they have
compatible settings.
3. Open the newly dropped icon
and then select the Refrigeration Leak alarm settings model in the Pick Alarm Settings
window of the Alarm Settings tab then click OK.
4. Choose the appropriate Set 1 alarm relay on the left panel. You should have between 1 and 10
ppm reading when sensor is powered. Right panel Set 2 is used to warn on 0 ppm reading for
too long. Set 2 alarm would mean a bad calibration, bad wiring or sensor not powered.
5. Name the sensor object in the Details tab and make the connection with the node in the
Hardware tab.

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 8
OPERATION
Figure 10
Components Description and Use.
Dip Switch -- Switches 1 to 8 are set to off at the factory. This is the standard dip switch setting for
network operation. (For normal operation with MTAlliance Dip Switch 7 should be up)
Switches 1, 2, and 3 - Switches 1, 2, and 3 are for network port addressing.
Switch 4 - is for auto long term zero compensation. It will recalibrate up to 10 ppm every 7 days.
No more than 100 ppm between manual calibrations. Disable for low level detection.
On zero Compensation SW4 = OFF
Disabled SW4 = ON
Switch 5 - is for field testing at a set level.
Normal SW5 = OFF
Fixed 200 ppm output SW5 = ON
Switch 6 - is for factory calibration.
Normal SW6 = OFF
Default Factory setting SW6 = ON
Switch 7 - is used to tell the microprocessor on board whether the sensor will be utilized as a network
system sensor or as a stand-alone sensor.
Network SW7 = OFF
Standalone (4-20mA) SW7 = ON
Switch 8 - is not used
Do not
remove the
plug

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 9
OPERATION continued
Push buttons – are located just on either side of the DIP Switch.
Push button 1 is used for testing the sensor with a 200 ppm false signal. Dipswitch 5 can be used
for the same function.
Push button 2 is used for sensor calibration and is used in conjunction with LED 2
Light Emitting Diodes (LED)
LED L1 will indicate if the sensor microprocessor is operating and if the sensor if the sensor is in
test mode. When the microprocessor goes through start-up, it will turn on L1 and keep it on unless
switch 5 is on or pushbutton 1 is depressed.
Status Condition
Off Sensor is not powered up.
Microprocessor detects an error in the sensor hardware.
Microprocessor Failure
ON Steady Sensor is operating properly.
ON Flashing Switch 5 is set to on or pushbutton 1 is depressed or microprocessor error.
LED L2 is used for zero calibration. When pushbutton 2 is pressed, LED 2 will light after 8
seconds and turn off once the button is released.
Status Condition
Off Normal operation
ON Steady Factory Calibrated Setting.
Turn switch 6 off
ON Flashing Microprocessor error. Call factory.
Potentiometers. The MT-IR contains several potentiometers used in factory testing and calibration.
They are located inside the main part of the housing and there should be no need to open this part
of the sensor to make any adjustments. It is not recommended to do so as this could void the
warranty and cause permanent damage to the sensor.
The MT-IR has an effective sensing range of 0 to 1000 ppm.
4-20 mA Sensor/ Transmitter
0 - 3.95mA - Sensor Malfunction 4.0mA - 0 ppm, 20mA - 1000 ppm
The performance equation is:
mA reading=ppm * 0.016 + 4.0
To convert 4-20mA into voltage for a 10k PLC input impedance use the following shunt resistor:
255 ohms, 1%, 1/4W between the input and common to make 1 to 5V signal
523 ohms, 1%, 1/4W between the input and common to make 2 to 10V signal

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 10
CALIBRATION
Prior to shipment, all sensors manufactured are factory calibrated. The calibration method will set
the base level (or Zero Level) and the gain (or Slope). As the sensor gets older or the ambient
condition changes drastically, the Zero Level may drift upward or downward. The Gain (Slope) will
not normally change.
An adjustment of the Zero Level is necessary to ensure that the MT-IR is reading accurately. This
should be done every 6 months. This function can be performed by conducting the Calibration Push
button.
PUSH BUTTON 1 -- Located just to the left of the red DIP Switch block.
1) Make sure the unit is properly wired up and all dip switches are in the off position.
2) Allow at least three hours warm up time. The ambient temperature should be stable and within
the desired operating range.
3) Make sure no refrigerant gas is present during calibration.
4) Depress and hold down the push button 1 (located to the left of DIP SW1) for at least 8 seconds
until the calibration LED red light above the push button lights. Release the push button.
5) The LED red light will go off. If not, make sure switch 6 is off. Consult factory if calibration
LED light stays on or keeps flashing after calibration or during normal operation.
NOTE: If the sensor is reading greater than 80, the sensor will not calibrate. Check for gas leak
around the sensor.
MEASURED GAS CALIBRATION
Equipment Required.
1 Refrigerant Sensor Calibration and Test Kit which includes:
a. Flow Regulating Valve - 1 Liter per minute
b. Calibration Gas Canister - 79.1% Nitrogen / 20.9% Oxygen (Zero Gas)
c. Calibration Gas Canister - Nitrogen Balance / Measured quantity of Refrigerant Gas (Span Gas)
d. Vinyl Tubing for IR Sensor.
The measured gas calibration procedure may be used as a double check of sensor accuracy and only
needs to be done if there are questions of whether or not the sensor is working. It is not necessary
to use measured gas to calibrate the infrared sensor. This procedure involves changing the air
currents drastically inside the sensing chamber, so please use the procedure listed below only as a
test. Since the gas is forced into the sensor the reading will not be as accurate as a normal reading. At
the factory we allow for normal airflow that would occur in a real leak when we calibrate the sensor
and set the zero level. So there will be an artificial reading between the zero gas and measured gas
because of the unusual air currents involved.
1) Place the Plastic tubing that comes with the calibration kit over the inlet valve located to the right
of the wiring plug and connect the other end to the calibration gas canister regulator.
2) Run the 20.9% O2 gas into the sensor for about 5 minutes and wait for the reading to settle.
Press the push button on the sensor right above the dipswitch for 10 seconds. This will be the
artificial zero level.
3) Next run the measured refrigerant gas into the sensor for about 5 minutes. The difference
between the artificial measured gas reading and the artificial zero level reading should be close to the

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 11
measured gas concentration however the way the gas is pumped in will create errors in the accuracy
of the reading.
4) Once the measured gas testing is complete and no gas is present and the sensor is mounted in
normal conditions, do the push button calibration once again to remove any artificial readings that
were introduced during measured gas calibration.
INFRARED SENSOR - QUICK START INSTRUCTIONS
1. Mount the sensor in a fixed location and in the proper orientation. (See "Mounting
Instructions")
2. Wire the sensor to the Controller. Use only approved wire and double check for proper and
secure connections. (See "Wiring Diagrams")
3. Push all Dip Switches down except Dip Switch 7.
4. Turn on Power to the Sensor and allow 3 hour warm up time. Check power in and polarity.
Warm up time is important to allow time for the Sensor to acclimate to the environment. No
reading is possible for 5 minutes after power up.
5. Variation between 1 to 10 ppm is “Normal”. It is not gas detection; this is to shows the
sensor is powered.
6. Calibration and Zeroing of Sensor. The Infrared Sensor is factory calibrated, however the
temperature and air quality and other variances make it necessary to calibrate and zero out
the sensor at the time of set up in the field and every 6 months.
7. Test the Sensor (Optional). The sensor may be tested by activating Dip switch 5 or by using
a measured gas calibration test kit.
MAINTENANCE SCHEDULE
To aid in performing the maintenance schedule, remember to write down the sensor start up date on
the front of the sensor. If it is not written down and a problem due to calibration occurs, this could
void the warranty. It is recommended that infrared sensors are zero calibrated every 6 months to
insure accuracy. Most of the time push button calibration and control calibration is all that is needed
to re zero the sensor and keep it from false alarming. See step 4 of quick start above for more.
Measured gas calibration should only be necessary for testing accuracy and if the sensor fails to pick
up a leak and is suspected of being damaged or faulty.

70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc 12
TROUBLESHOOTING
LED L1 is steady ON when the sensor microprocessor is operating and flashes when the sensor is
in test mode using dip switch 5 or pushbutton 1. When the microprocessor goes through start-up, it
will turn on L1 and keep it on unless the microprocessor detects a failure of any of the sensor
components.
LED L2 is used for calibration of the sensor and is normally off. When the Push Button Calibration
is done, L2 will turn on in about 8 seconds then turn off when Push button is released.
LED Status Condition Solution
L1 Off Sensor is not powered up Check power connector. Ensure that the
sensor is being powered by 12 - 32 VDC.
Ensure that wire connections are secure and
are correct polarity.
Microprocessor detects an error in the
sensor hardware or Microprocessor Failure.
Call MTT technical support
L1 On Steady Sensor is operating properly.
L1 on Flashing Switch 5 is on to force a 200
ppm reading on the sensor
Microprocessor detects error in
the sensor signal.
Push Dip Switch 5 down.
If switching SW5 does not work, call MTT
technical support.
L2 Off Sensor is operating properly.
L2 On Flashing Microprocessor Failure Call MTT technical support
L2 On Steady Sensor is on factory calibration
setting
Turn Dip Switch 6 off and wait at least 1
minute for L2 to turn off and do Push
Button calibration again.
Output variation Sensor reading shows the
presence of much more than 10
ppm of gas.
Was the calibration procedure followed?
First attempt Push button procedure. Check
area for a leak. Check for wiring problems or
the presence of gas.
Make sure all Dip Switches except 7 are set
to off position.
How old is the sensor?
Output at zero Sensor reading shows zero even
with test gas
Turn Dip Switch 7 to on.
Output at max Sensor output has a full scale
reading
Check for wiring problems. Turn Dip Switch
5 to on. If the MTA reads about 200 there
could be a sensor problem, contact technical
support. If it still reads full scale double
check for missing resistor. How old is the
sensor?