Distech Controls GS-CDR20K Series Hardware-Installationshandbuch - Seite 3

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Start-Up
Verify the device is properly wired and connections are tight. Ensure
the V/I switch is set for the correct signal type. Apply power and the
LCD will indicate the software version number, the output signal type,
the relay setpoint (if installed), the CO
the sensor will begin reading the CO
signal and display the value on the LCD.
Output
The CO
output is scaled such that 4-20 mA (or 0-5/0-10 Vdc) equals 0
2
to Out_High. The factory default is 0-20,000 ppm. Out_High can be
changed in the Setup Menu and the output is scaled accordingly. If
using voltage output type, the default is 0-5 Vdc (0-10 can be selected
in the menu).

Operation

The output signal is available on the CO
the BAS analog input which reads the signal and calculates the CO
ppm value using correct scaling for the range and signal type. The CO
value is used to control output ventilation devices or initiate alarms.
The CO
value is also displayed locally on the optional LCD.
2
If a relay is installed it can control a small fan or alarm by setting the
trip value and hysteresis to appropriate values.
If a temperature sensor is installed it will be wired to an analog input of
the BAS that is set for the specific resistance type. This could be a 10
KΩ thermistor, a 1000 ohm RTD or other sensor values. The BAS
reads the resistance signal and converts it to a temperature value.
The override switch provides a dry contact closure to a digital input of
the BAS. The slide pot can be connected to another analog input and
will provide a linear signal such as 0-10 KΩ to be used as a setpoint
control.
Calibration
Calibration with gas requires a field calibration kit with pressure
regulator, necessary tubing and appropriate bottles of CO
The GS-CDR20K series dual-channel sensors with extended range
requires a 3-point calibration with 0, 1000 and 20,000 ppm gas (in
order).
0 PPM Calibration
1.
Turn the regulator knob off and attach it to the Nitrogen gas bottle
and hand tighten.
2.
Remove the cover of the unit to be calibrated to expose the gas
sensor chamber.
3.
The tubing from the gas bottle can be connected to either port on
the chamber after the plastic cap is removed.
4.
Gently remove one cap and connect the tubing. Note that strong
shock or vibration can affect calibration.
5.
Ensure the device has been operating normally for at least five
minutes before applying gas.
6.
Turn the valve knob on the regulator to start the gas flow. The
regulator will restrict the flow rate to the specified 100 ml/min.
7.
After a brief period the gas will flow into the chamber. Wait 1 to 2
minutes until the CO
stabilizes.
2
Enter the Setup menu and use the <MENU> key to advance to
8.
Calibrat 0 PPM.
9.
Press and hold the <SAVE> key for 2 seconds and the display will
change to Waiting Calibrat then to Waiting 5 minute to indicate
that the process of setting the internal calibration is taking place.
10. This takes about 5 minutes while the LCD counts down. Do not
disturb the unit or the gas flow. When complete the unit will
display the ppm value and Cal Done.
11. Press the <SAVE> key to return to normal operation and shut the
gas off.
3/5
measurement range and then
2
level, output the correct analog
2
terminal and is connected to
2
gas
2
1000 PPM Calibration
1. Connect the 1000 ppm CO
The CO
reading on the LCD will begin to approach 1000 ppm. Wait
2
1 to 2 minutes until the CO
2.
Enter the Setup menu and use the <MENU> key to advance to
Calibrat 1000 PPM.
3.
Press and hold the <SAVE> key for 2 seconds and the display will
change to Waiting Calibrat then to Waiting 5 minute to indicate
that the device is calibrating.
minutes. When calibration is complete the unit will display the
ppm and Cal Done.
4.
Press the <SAVE> key to return to normal operation and shut the
gas off.
20,000 PPM Calibration
1. Connect the 20,000 ppm CO
LCD will begin to approach 20,000 ppm. Wait 1 to 2 minutes until
the CO
reading stabilizes.
2
2.
Enter the Setup menu and use the <MENU> key to advance to
Calibrat 20,000 PPM.
3.
Press and hold the <SAVE> key for 2 seconds and the display will
change to Waiting Calibrat then to Waiting 5 minute.
4.
Again, wait 5 minutes and when calibration is complete the unit
will display the ppm and Cal Done.
2
5.
Press the <SAVE> key to return to normal operation and shut the
2
gas off.
6.
Disconnect the tubing and replace the cap on the sensor chamber
as calibration is complete.

Setup Menu

The menu has several items shown below. Some items change
depending on the hardware configuration and the CO
To enter the menu, press and release the <MENU> key while in
normal operation.
This will enter the SETUP menu step 1, pressing the <MENU> key
again advances to step 2.
Each press of <MENU> advances the menu item. No values are saved
or changed by using <MENU>.
The <ROLL> key is used to make changes to program variables by
scrolling through the available options. When a value is changed, use
the <SAVE> key to save it to memory and advance to the next menu
item.
1. Press and release the <MENU> key to enter the SETUP menu.
-
If the 20,000 ppm CO
a)
Out High: The default CO
span can be changed from 2000 to 20,000 ppm in
increments of 500. Use the <ROLL> key to change the
value and <SAVE> to save. The factory default is 20,000
ppm.
2.
Altitude: The default is 0 feet. Change by using the <ROLL> key
from 0 to 5000 feet in 500 feet increments. Change for CO
altitude correction and press <SAVE> to save a change.
Items 3, 4 and 5 are only available if the Relay Option is installed,
otherwise the menu skips directly to step 6.
3.
Relay SP: The relay trip setpoint default is 1000 ppm. It can be
changed from 500 to 15,000 ppm. Save changes by using the
<SAVE> key.
4.
Relay Hy: The relay hysteresis default is 50 ppm. This can be
changed from 25 to 500 ppm. Use <SAVE> to save any change.
5.
Relay: Use the <ROLL> key to toggle the relay ON or OFF for
testing purposes. Press either <SAVE> or <MENU> to turn the
relay off and advance to the next item.
6.
Out Type: For voltage, the factory default output type is 0-5 Vdc.
Use the <ROLL> key to change the value to 0-10 Vdc if
necessary. Press the <SAVE> key to save. If the switch is set to
mA, then 4-20 mA is displayed.
gas bottle and apply the gas as before.
2
reading stabilizes.
2
Again, this process takes about 5
and apply the gas as before. The
2
sensor.
2
range is installed (GS-CDR20K models)
2
range is 0-20,000 ppm. The
2
local
2