Oldham CPS Series, User Manual

Page: 51 / 76

CPS
– User Manual
Page 51
Manual calibration
The calibration kit provided by ISC must be used (Ref. 6 116 291) female connector / wires /
voltmeter connection files).
-
Remove the sensor cover.
- Connect the cable (strand) to the circuit
’s male connector.
Zero adjustment
Ensure that the sensor is in clean air. If not, inject air into the sensor at a flow rate of 60 l/h, then
wait for voltmeter levels to stabilize (use the gas injection device: bottle of synthetic air, calibration
pipe, tube).
-
Adjust the zero with the potentiometer
’s “
ZERO
” until the voltmeter reads
0 mV.
Sensitivity adjustments
-
Now inject the known gas (60 l/h) into the sensor, and wait for the voltmeter signal to stabilize.
-
Adjust the sensitivity if necessary with the potentiometer
“
SENS
” until the signal value (in mV)
corresponds to the amount of reference gas used. Use the following formula to calculate
the correct value for the signal.
- Stop injecting gas (remove the calibration pipe from the sensor).
-
Wait for the voltmeter to
“return to zero.”
Version CPS 10 for explosive gas
The CPS central controller has a
“
verification
” function: if
the sensor measures a concentration of gas higher than
100% LEL, the signal will be dismissed by disconnecting its
power supply.
MAINTENANCE WIRES:
+VCC ( red ) = + power supply
Signal S ( yellow ) = signal from 0 mV to 1600 mV for zero and sensitivity measure
Ref 2,5V ( brown ) = zero reference for signal reading from 0 mV to1600 mV
GND ( black ) = electronic circuit ground.
Toron OLCT 10
– CPS 10 6pts /
Réf. 6 116 291
O V
Réf. 2,5V
Signal S
+ VCC
V
CPS 10_Tox
SENS
ZERO
SENS
ZERO
CPS 10_Explo
V
Measuring scale
1600
Reference gas value
U
(mV)
=
x