Oldham OLCT 10N, User Manual

Page: 20 / 44

20 OLCT 10N
User Manual
Manual calibration
A voltmeter and the female connector provided by Oldham (P/N 6116291) are
required.
1. Remove the detector cover.
2. Connect the connector
to the circuit’s male connector
3. Connect the voltmeter between S+ and S- (value in mV)
Zero the sensor
1. Ensure that the sensor is in clean air (in absence of O2 in the case of
OLCT 10N O2). If not, inject zero air (Nitrogen in the case of an OLCT 10N
O2) into the sensor at a flow rate of 1 l/min, then wait for voltmeter signal to
stabilize (use the calibration gas kit: zero air cylinder, calibration cap, tube).
2.
Adjust the zero with the potentiometer’s
ZERO until the voltmeter reads 0
mV.
Sensitivity
1. Now inject the calibration gas (1 l/min) into the sensor. Wait for the
voltmeter signal to stabilize (use the calibration gas kit: calibration gas
cylinder, calibration cap, tube).
2. Adjust
the sensitivity if necessary with the potentiometer “
SENS
” until the
signal value (in mV) corresponds to the concentration in the reference gas
used.
Use the following formula to calculate the correct value for the
signal .
3. Stop injecting gas (remove the calibration pipe from the sensor).
4. Wait for the
voltmeter to “return to zero”.
U
(mV) =
1600 x reference gas concentration
measurement scale