Greystone Energy Systems CMD5B4 Series User manual

Page 1
INTRODUCTION
The Carbon Monoxide Transmitter uses an electrochemical
sensor to monitor th carbon monoxide level and outputs
a eld-selectable 4-20 mA or voltage signal. The voltage
signal may also be set to 0-5 or 0-10 Vdc. The sensing range
and output may be scaled to either 100, 150, 300, 400,
or 500 ppm via the on-board menu. A front panel LCD is
standard to ensure easy setup and operation.
Other standard features include a back light for the LCD,
a front panel test switch, status indication and an alarm
buzzer. The text function may also be controlled remotely
withadigitalinputsignal.Athree-key menu is implemented
to allow local conguration of all device parameters.
BEFORE INSTALLATION
Read these instructions carefully before installing and commissioning the CO transmitter. Failure to follow
these instructions may result in product damage. Do not use in an explosive or hazardous environment,
with combustible or ammable gases, as a safety or emergency stop device or in any other application
where failure of the product could result in personal injury. Take electrostatic discharge precautions
during installation and do not exceed the device ratings.
MOUNTING
The device should be mounted ve feet from the oor of the area to be controlled. The four integrated
mounting holes facilitate a #10 size screw (not supplied). See Figure 1. Do not mount the sensor near doors,
opening windows, supply air diusers, or any other known air disturbances. Avoid areas with vibrations
or rapid temperature changes.
The enclosure has a hinged cover with a latch, open it by pulling slightly on the latch on the right side of
the enclosure while pulling on the cover. See Figure 2.
Make all connections as per the "Wiring" instructions on page 2.
Once all connections are complete, latch the cover. Two self-taping screws are provided for extra security,
see Figure 3.
HARDWARE SETUP
The only hardware setup required is to select the
analog output type with the PCB switch labeled
VOLT and mA. Slide the switch to the correct
position for the required output signal type, either
4-20 mA or 0-5/10 Vdc.
Figure 1
Figure 3Figure 2
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Carbon Monoxide Transmitter
CMD5B4 Series - Installation Instructions
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Page 2
POWER AND ANALOG OUTPUT WIRING
Use 22 AWG shielded wire for all connections and do not locate the device wires in the same conduit with
wiring used to supply inductive loads such as motors. Disconnect the power supply before making any
connections to prevent electrical shock or equipment damage. Make all connections in accordance with
national and local codes.
The wiring conguration depends on the specic model and the installed options. Follow the example
wiring diagrams to determine the correct wiring. All models have the same terminal functions. This device
has a half-wave type power supply so the power supply common is the same as the output signal common.
Therefore, several devices may be connected to one power supply and the output signal all share the same
signal common. Use caution when grounding the secondary of an AC transformer or when wiring multiple
devices so that the circuit ground point is the same on all devices and the controller.
In general the transformer should NOT be connected to earth ground when using devices with RS-485
network connections.
This is a 3 wire sourcing device. All models require a 24 Vac/dc power supply to operate. Connect the
positive DC voltage or the hot side of the AC voltage to the ANALOG - PWR terminal and the power supply
common to the ANALOG - COM terminal. Note that the Analog COM terminal is NOT connected to the
Relay COM terminals. The device is reverse voltage protected and will not operate if the power supply is
connected backwards.
The linear output signal (either 4-20 mA or 0-5/10 Vdc) is available on the ANALOG - CO terminal. The
signal is referenced to the Analog COM terminal. The 4-20 mA output signal operates in the Active mode
and does not require a loop power supply. This means the signal current is generated by the transmitter an
must not be connected to a powered input or device damage will result. This is the typical operating mode
of a 3 wire device. Ensure the controller Analog Input matches the device output signal type before power
is applied. The current signal has a maximum load and it will drive and the voltage output has a minimum
load. Follow the ratings for the device or inaccurate readings may result. The power must be disconnected
to change from VOLT to mA. The analog output CO signal is typically connected directly to the Building
Automation System (BAS) and used as a control parameter or for logging purposes.
REMOTE TEST WIRING
The CO transmitter has aTest function that will test the analog output and the alarm relays which is initiated
by pressing the front panel TEST switch. The Test function may also be initiated remotely by shorting the
Figure 4
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Page 3
OPERATION - START-UP
Verify that the CO Transmitter is properly wired according to the wiring diagrams and all connections
are tight. Ensure the output switch is in the correct position for either voltage or mA. Apply power to the
device.
The device will initially start up in warm-up mode which lasts for about two minutes. Immediately after
applying power the LCD will display the software version number and begin a two minute countdown.
The alarm buzzer will also beep.
During the warm-up mode the alarm relays will be set to o, the LED will ash red, all communications are
disabled, the key pad is disabled and the analog output will be set to it's minimum value.
OPERATION - NORMAL MODE
In normal operation the sensor will measure the CO level in the surrounding air and output a proportional
value on the analog output which is scaled to the default range of 0-300 ppm. The CO reading will also be
displayed on the LCD and updated in the communication value. If alarm relays are installed, the present
CO reading is compared to the set-points and appropriate action is taken if an alarm condition exists. The
status LED on the front cover will be green to indicate normal operation.
OPERATION - ALARM MODE
The CO reading is compared to pre-set set-points for alarms and if they are exceeded the device enters
Alarm mode. The alarm reset back to Normal mode can be congured via the menu as either Automatic
Reset or Manual Reset.
AUTOMATIC ALARM RESET (DEFAULT)
Two optional relays are used to indicate alarm conditions. The trip point, hysteresis and delay time of
each relay can be programmed via the menu. For example, Relay 1 defaults to a 50 ppm trip point, 10
ppm hysteresis and 2 minute delay time. Relay 2 defaults to a 150 ppm trip point, 20 ppm hysteresis and
2 minute delay time All of these values can be changed via the menu. In the example for Relay 1, a timer
is started when the CO level exceeds 50 ppm (the trip level). If the level drops below 50 ppm before 2
minutes (the delay time) has expired then the relay is not activated. If the CO level exceeds 50 ppm for
2 minutes then the relay is activated. The relay will remain activated until the CO level drops below 40
ppm (trip level – hysteresis). This relay can be used to signal a “low alarm”. Relay 2 operates in the same
manner and has independently programmable trip point, hysteresis and delay time. This relay can be used
to signal a“high alarm”. The LCD will indicate the Alarm mode details and the LED will ash red.
The buzzer alarm defaults to a 150 ppm trip point and 5 minute delay time and can be programmed
similarly to the relays. When the trip point is exceeded for a time longer than the delay time, then the
buzzer will sound until the CO level falls below the trip point. The buzzer operates independently of the
relay alarms and can be disabled via the menu. If enabled, and the device is in Alarm mode, pressing the
TEST switch will "silence" the buzzer only. Buzzer silence will only hold until the alarm condition is cleared
so the next CO set-point alarm will activate the buzzer again.
MANUAL ALARM RESET
In this case, the alarm relays will activate the same way as described above but will not automatically reset
to Normal Mode when the CO level drops below the trip level - hysteresis value. In order to reset the relay
alarms to Normal Mode the user must also press the TEST switch on the front cover (or activate the remote
TEST input). If the CO level is below the alarm level AND the TEST switch is pressed, then the relay alarms
will return to the Normal Mode.
TEST + and TEST - terminals. Note that the TEST - terminal is connected to the Analog COM terminal. The
TEST terminals should only be connected to a dry-contact digital output from the controller that is either
shorted or oating open. Ensure no power is applied to the TEST terminals. The TEST terminals may also be
connected to a remote switch. If desired, only one wire need be connected to the TEST + terminal and use
the power supply COM as the return signal path.
ALARM RELAY WIRING
If equipped, the alarm relay outputs are available on the NO, COM and NC terminals for each relay. The
relay COM terminals are NOT connected to the signal or power supply COM terminal nor to each other. The
two relays are completely isolated and have both Normally Open (NO) and Normally Closed (NC) contacts.
These signals can be used to directly control alarms, ventilation fans or may be connected to digital inputs
of the BAS for status monitoring. Ensure any loads connected to the relays are within the relay ratings in
the Specication section.
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Page 4
The Manual Reset also applies to the buzzer alarm. If the buzzer alarm is active, pressing the TEST switch
will "silence" the buzzer. If the buzzer alarm was active but the CO level has been reduced below the trip
point, then the TEST switch must be pressed to reset the buzzer alarm to the Normal Mode.
OPERATION - TEST MODE
The Test mode function is disabled by default, it must be enabled via the menu to operate. To initiate the
Test function during normal operation, either press and hold the TEST switch for 1 second or activate it
remotely by shorting the TEST + to TEST – (COM). This will cause the Status LED to blink red, the analog
output to go to 100% and both relays to activate. The buzzer will also beep once every 15 seconds if
enabled and the LCD will indicate theTest mode and the remaining time. TheTest function will continue for
5 minutes (default) and then the device will reset to normal operation. The Test function can be canceled
by pressing the TEST switch a second time. Test mode cannot be activated if the device is in Fault, Alarm or
Re-Cal modes of operation, only in Normal mode. The Test function is useful to verify the output and alarm
relay operation and the Test time can be programmed via the menu.
OPERATION - FAULT MODE
The Fault mode function is disabled by default, it must be enabled via the menu to operate. The Fault
function will monitor the CO sensor lifetime and indicate when the CO sensor should be replaced. If the
device determines that the sensor has reached the end of it's useful life and that replacement is necessary
it will enter Fault mode. This will cause the Status LED to blink red and the buzzer to beep once every 10
minutes. The LCD will periodically show "Sensor Fault". The Fault mode can be disabled via the menu or
enabled at any time. If enabled, and the device is in Fault mode, pressing the TEST switch will "silence" the
buzzer due to the Fault alarm only. Buzzer silence due to the Fault alarm will hold until the fault condition
is reset via the menu. The buzzer may still activate due to a CO set-point alarm if enabled.
OPERATION - RE-CAL MODE
The Re-Cal mode function is enabled by default, it must be disabled via the menu if it is not required.
The Re-Cal function will monitor the device and indicate when the CO sensor should be re-calibrated.
If the device determines that the sensor requires re-calibration it will enter Re-Cal mode. This will cause
the Status LED to blink red and the buzzer to beep once every 10 minutes. The LCD will periodically show
"ReCal Required". If enabled, and the device is in Re-Cal mode, pressing the TEST switch will "silence" the
buzzer due to the ReCal alarm only. Buzzer silence due to the ReCal alarm will hold until the ReCal condition
is reset via the menu. The buzzer may still activate due to a CO set-point alarm if enabled.
OPERATION - USER MENU
The device has several parameters that can be congured locally via the User menu using the keypad and
LCD. All parameters default to typical values but the installer may want to change some values. In some
cases, such as the device network address, the installer MUST change the settings before operation. Any
changes made are saved in non-volatile memory and are restored in case of a power loss. Only the menu
items relevant to the device model will be shown. The menu can be accessed at any time after the warm-
up mode and if there is 5 minutes of inactivity the menu will close and normal operation will continue.
Note that the TEST switch has no aect when the User menu is in use.
The menu has several items as shown below. To enter the menu, press and release the <MENU> key. This
will enter the User menu step 1, pressing the <MENU> key a second time advances to step 2. Each press
of the <MENU> key advances the menu item. No values are saved or changed by using the <MENU> key.
The <ROLL> key is used to make changes to program variables by scrolling through the available options.
Holding the <ROLL> key pressed will scroll through some options at a faster rate. When a value is changed,
use the <SAVE> key to save it to memory and advance to the next menu item. The rst column below
shows what will be displayed on the LCD, including the default value. The following screen examples show
the default setting.
<Menu> Press and release the <MENU> key to enter the User Menu.
CO Range
0-300ppm
Press the <ROLL> key to scroll through the available options. The CO sensing
range and output scale can be changed to 0-100ppm, 0-150ppm, 0-300ppm,
0-400ppm, or 0-500ppm Press the <SAVE> key to save any change.
<MENU> Press to advance to next menu item
1. CARBON MONOXIDE RANGE
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Page 5
Buzzer
Del 5Min
Use the <ROLL> key to scroll through the available options.
The buzzer delay may be set from 0 to 10 minutes in 1 minute
increments. Press <SAVE> to save the setting. The factory
default is 5 minutes.
<MENU> Press to advance to next menu item
Buzzer
Trip 150
Buzzer
Test OFF
Relay 1
Trip 50
Use the <ROLL> key to scroll through the available options. The
buzzer alarm trip point may be set from 20 to 500 ppm in 10
ppm increments. Press the <SAVE> key to save the setting.
Use the <ROLL> key to toggle the buzzer ON or OFF.
Use the <ROLL> key to scroll through the available options. The
relay 1 alarm trip point may be set from 20 to 500 ppm in 10
ppm increments. Press <SAVE> to save the setting.
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
4. BUZZER DELAY
3. BUZZER TRIP
5. BUZZER
6. ALARM TRIP
POINT
Only if Buzzer enabled
Relay 1
Hyst 10
Relay 1
Del 2Min
Relay 1
Direct
Relay 1
Test OFF
Use the <ROLL> key to scroll through the available options.
The relay 1 hysteresis may be set from 10 to 100 ppm in 5
ppm increments. Press <SAVE> to save the setting. Note that
the maximum value may be limited by the trip point value.
Use the <ROLL> key to scroll through the available options.
The relay 1 delay may be set from 0 to 10 minutes in 1 minute
increments. Press <SAVE> to save the setting.
Use the <ROLL> key to toggle the available options. Relay 1
operation may be set to Direct or Reverse. Direct operation
means the relay is normally not energized and will enerize on
an alarm condition (the NO/NC PCB designations are correct).
Reverse operation means the relay is normally energized
and will de-energize on an alarm condition (the NO/NC PCB
designations are reversed). Reverse operation can be used for
"Fail Safe" operation as the relay will change state on power
loss. Press <SAVE> to save the setting.
Use the <ROLL> key to toggle relay 1 ON or OFF.
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
7. HYSTERESIS
8. DELAY
9. DIRECT
10. ON/OFF
Only if Relay 1 installed
Buzzer
Enable
Use the <ROLL> key to enable or disable the buzzer alarm. When disabled, the
buzzer will not sound if the buzzer trip point is exceeded. The buzzer will still
beep on startup and will still beep for a fault alarm (if enabled) and ReCal alarm
(if enabled). Press <SAVE> key to save the setting.
<MENU> Press to advance to next menu item
2. BUZZER ALARM
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Page 6
Only if Relay 2 installed
Relay 2
Hyst 20
Relay 2
Del 2Min
Relay 2
Direct
Relay 2
Test OFF
Use the <ROLL> key to scroll through the available options.
The relay 2 hysteresis may be set from 10 to 100 ppm in 5 ppm
increments. Press <SAVE> to save the setting. Note that the
maximum value may be limited by the trip point value.
Use the <ROLL> key to scroll through the available options.
The relay 2 delay may be set from 0 to 10 minutes in 1 minute
increments. Press <SAVE> to save the setting.
Use the <ROLL> key to toggle the available options. Relay 2
operation may be set to DIrect or Reverse. Direct operation
means the relay is normally not enerized and will energize on
an alarm condition (the NO/NC PCB designations are correct).
Reverse operation means the relay is normally energized
and will de-energize on an alarm condition (the NO/NC PCB
designations are reversed). Reverse operation can be used for
"Fail Safe" operation as the relay will change state on power loss.
Press <SAVE> to save the setting.
Use the <ROLL> key to toggle relay 2 ON or OFF.
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
12. HYSTERESIS
13. DELAY
14. DIRECT
15. ON/OFF
TestMode
Disable
Use the <ROLL> key to enable or disable the Test mode. When disabled, the
TEST switch or TEST input will not initiate the test function. When enabled,
the TEST switch will initiate the test function. Note that the test mode will only
function if the device is operating in the Normal mode, the test function cannot
be initiated if any alarm is present. Press <SAVE> to save the setting.
<MENU> Press to advance to next menu item
16. TEST MODE
Only if Test Mode disabled
TestMode
Time 5
Use the <ROLL> key to scroll through the available options.
The test mode operating time may be set from 1 to 15
minutes in 1 minute increments. Press <SAVE> to save the
setting. This item sets how long the test mode will operate
when the TEST switch is pressed.
17. OPERATING
TIME
<MENU> Press to advance to next menu item
Relay 2
Trip 150
Use the <ROLL> key to scroll through the available options. The
relay 2 alarm trip point may be set from 20 to 500 ppm in 10
ppm increments. Press <SAVE> to save the setting.
<MENU> Press to advance to next menu item
11. ALARM TRIP
POINT
<MENU> Press to advance to next menu item
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Page 7
ReCal Md
Enable
ReCal Md
Time 1yr
Alarm Md
Auto
Use the <ROLL> key to select enable, disable or reset. When disabled, the
device will not sound the buzzer or provide LCD and status LED indication
when the sensor requires re-calibration. When enabled, the ReCal alarm will
activate to indicate the sensor requires re-calibration. Press <SAVE> to save
the setting. If it is set to reset and <SAVE> is pressed, the ReCal condition is
cleared, the ReCal timer is reset and ReCal mode is set back to it's default of
enable. This can be used if the CO sensor is required to be re-calibrated at
known intervals.
Use the <ROLL> key to set the ReCal mode timer to 1, 2 or 3 years. The factory
default is 1 year. Press <SAVE> to save the setting. This is used to set the CO
sensor re-calibration interval.
Use the <ROLL> key to set the alarm mode to auto or manual. The setting
controls how the relay alarms and the buzzer alarm resets back to normal
mode. For the auto setting, the device will reset the alarms automatically once
the CO level drops below the set alarm thresholds. For the manual setting,
the CO level must be below the alarm thresholds AND the user must press
the TEST switch on the device to reset the alarms. Press <SAVE> to save the
setting.
20. RECAL MODE
21. RECAL TIMER
22. ALARM MODE
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
<MENU> Press to advance to next menu item
Only if ReCal Mode enabled
0 Filter
Enable
Use the <ROLL> key to enable or disable the zero lter. When enabled, the
device will lter low ppm readings such that 0-5 ppm CO will display and
output 0 ppm. When disabled, 0-5 ppm will display and output actual 0-5
ppm. Press <SAVE> to save the setting. The factory default is enable. Note that
this should be set to disable when doing a ZERO gas calibration.
23. ZERO FILTER
<MENU> Press to advance to next menu item
Fault Md
Time 3yr
Use the <ROLL> key to set the fault mode timer to 3, 4, 5 or 6 years. The
factory default is 3 years. This item is not shown if the fault mode is disabled.
Press <SAVE> to save the setting. If a desired time has already been exceeded,
then it cannot be selected.
19. FAULT MODE
TIMER
<MENU> Press to advance to next menu item
Fault Md
Disable
Use the <ROLL> key to enable, disable, or reset. When disabled, the device
will not sound the buzzer or provide LCD and status LED indication when the
sensor life is exceeded. When enabled, the fault alarm will activate to indicate
the sensor life is exceeded. Press <SAVE> to save the setting. The factory default
is disabled. If it is set to reset and <SAVE> is pressed, then the fault condition is
cleared, the life-time timer is reset and fault mode is set back to it's default of
disable. It may be enabled again. This can be used if the fault alarm is required
and the CO sensor is replaced.
18. FAULT ALARM
<MENU> Press to advance to next menu item
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Page 8
Output
Test OFF
Menu
Exit
Use the <ROLL> key to scroll through the available options. The output
and display depends on the output type conguration. For 4-20 mA
output type settings are OFF/4/8/12/16/20 mA, for 0-5 Vdc output they are
OFF/0/1/2/3/4/5/ Vdc and for 0-10 output they are OFF/2/4/6/8/10 Vdc. This
can be used to test the output signal.
Press <SAVE> to exit the menu and return to normal operation or <MENU> to
repeat the menu.
27. OUTPUT TEST
28. EXIT
<MENU> Press to advance to next menu item
CALIBRATION
The CO transmitter features a cover mounted sensor PCB that is pre-calibrated. This means that the entire
sensor PCB can simply be replaced with a new calibrated PCB if desired without having to remove the
enclosure and the main processor board. This sensor swap can be completed in seconds. Simply unplug
the device ribbon cable connection, remove the old sensor PCB, install the new PCB and reconnect the
ribbon cable. There is no need to make any adjustments or apply gas to the transmitter using the sensor
swap method. In this case, the Fault Mode should be reset if it is enabled.
The device may also be calibrated or veried with the CO gas if required. This requires a eld calibration kit
consisting of a bottle of gas (250 ppm CO in air for example), a tank pressure regulator with ow restrictor
and the necessary tubing with a calibration cap to cover to the sensor. Calibration can be done at 20 to
27°C.
Verication with gas can be done without removing the device cover. Simply apply gas using the calibration
cap attached directly to the port on the cover and monitor the
output signal or LCD.
The device cover must be opened to perform an actual calibration.
In the case, the gas calibration cap attached to the sensor xture
on the cover as before. The sensor must be continuously powered
for at least 1/2 hour prior to calibration. Calibrate the sensor rst
in clean air with no CO gas present. Simply adjust the ZERO pot on
the sensor board until 4 mA (or 0 Vdc) output is obtained and the
LCD displays 0 ppm. Note that the "0 Filter" menu item should be
disabled to set the 0 ppm. The ZERO and SPAN pots are located on
the edge of the cover sensor PCB and are clearly marked on the PCB.
Out Type
0-5 Vdc
Use the <ROLL> key to toggle the voltage output type to either 0-5 Vdc or
0-10 Vdc. Press <SAVE> to save the setting. Note that this item is only shown if
the PCB switch is in the VOLT position. Also note that the output type can only
be changed by disconnecting the power to the unit.
26. VOLTAGE OUTPUT TYPE
<MENU> Press to advance to next menu item
BackLite
Enable
Use the <ROLL> key to enable or disable the LCD backlight. When enabled the
backlight is always on and when disabled it never lights. Press <SAVE> to save
the setting.
25. BACKLIGHT
<MENU> Press to advance to next menu item
Display
CO Value
Use the <ROLL> key to toggle the setting to either CO Value or Status. When
set to CO value, the actual ppm value of the CO reading will be displayed on
the LCD. When set to Status, the PM value will not be displayed only the device
operating status. Press <SAVE> to save the setting.
24. CO VALUE/STATUS
<MENU> Press to advance to next menu item
Figure 5
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Page 9
SPECIFICATIONS
POWER SUPPLY
Power Supply.......................24 Vdc ±20% or 24 Vac ±10% (non-isolated half-wave rectied)
Consumption.......................100 mA max (with all options on)
Protection Circuitry............Reverse voltage protected, output limited and transient protected
Output Signal.......................4-20 mA active, 0-5 or 0-10 Vdc (selectable)
Output Drive Capability...Current: 450 Ω max
Voltage: 10 KΩ min
ENCLOSURE
LCD Display...........................1 ppm resolution, 35mm W x 15mm H, alpha-numeric
(1.4" x 0.6")
Status LED .............................Two color (red/green) on front panel
Test Switch............................Performs I/O tests, front panel and remote connection
Dimensions...........................127mm W x 101mm H x 65mm D (5" x 4" x 2.55")
Agency Approvals..............Sensor is UL recognized for ANSI/UL-2034 and UL-2075, E240671
BUZZER
Alarm.......................................85db @ 10 cm
Trip Point ...............................Programmable 20 to 500 ppm in 10 ppm increments
Delay .......................................Programmable 0 to 10 minutes in 1 minute increments
OPTIONAL RELAY
Outputs..................................Form C contacts (NO and NC), 5 Amps @ 250 Vac, 5 Amps @ 30 Vdc
Relay 1 Trip Point ................Programmable 20 to 500 ppm in 10 ppm increments
Relay 2 Trip Point ................Programmable 20 to 500 ppm in 10 ppm increments
Relay Hysteresis...................Programmable 10 to 100 ppm in 5 ppm increments
Relay Delay ...........................Programmable 0 to 10 minutes in 1 minute increments
GENERAL
Measurement.......................Electrochemical
Sample Method ..................Diusion
Measurement Range.........0-100, 150, 300, 400 or 500 ppm (selectable)
Accuracy ................................±5 ppm or ±5% of reading (whichever is greater)
0 to 50°C (32 to 122°F), 15 to 90 %RH
Operating Conditions .......-20 to 50°C (-4 to 122°F), 15 to 90 %RH, 0.9 to 1.1 atm
Stability ..................................<5% signal loss/year
Response Time ....................<35 seconds for 90% step change
Typical Area Coverage ......700 m2(7500 ft2) or 15 m (50 ft) radius
Wiring Connections...........Screw terminal block (14 to 22 AWG)
Country of Origin................. Canada
Then attach the gas supply. Turn the regulator on/o knob fully o and attach it to the 250 ppm gas bottle
and rmly tighten it by hand. Moisten the sponge and squeeze out any excess water. Place the sponge in
the cap so that it will not touch the sensor but does not plug the hole in the side of the cap. Attach the cap
to the xture over the sensor. If the gas cap is too loose on the xtures, simply place a wrap of electrical
tape around the cap the tighten. Slowly turn the valve knob on the regulator to let the gas begin owing.
The regulator will restrict the ow rate to the specied 200 ml/min and the sponge will ensure the gas is
in the right humidity range. Wait for 5 minutes and then adjust the SPAN pot on the sensor board until the
output and LCD reads 250 ppm. Close the valve on the tank and take a cap o from the sensor. Calibration
is complete. In this case, the ReCal Mode should be reset if it is enabled.
DIMENSIONS
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