GDC-350 Operation Manual
28
5909-9000
Rev
1
NOTE:
It is recommended that a calibration label should be applied after
every calibration to confirm work performed and the date it was confirmed.
If a controller is involved, the alarm set points should be indicated on a label
on the front door of the enclosure.
Calibration is achieved at the GDC-350 controller if the sensor is on board. If the
sensor is remote (i.e., a GDC-150 analog transmitter) the calibration is achieved at
the transmitter using the procedure indicated in its operation manual.
Required Equipment:
x
Volt
meter
x
Calibration
kit
x
Calibration
gases.
Users can order the calibration kit, calibration accessories and/or gases from any
Bacharach authorized distributor.
5.3. Calculating the Span Gas Value
To achieve calibration the user must first tell the GDC-350 what concentration of span
he is going to flow over the sensor. Within the controller, this is a voltage setting. The
range of 0-4 VDC is equal to the full measurement range of the sensor. Prior to
attempting to calibrate, determine the voltage value required. Consult the table on
page 23 for standard voltages. If the value desired is not indicated, use the following
formula to calculate the voltage required.
Therefore, in this example, the required voltage setting to calibrate a 0-200 ppm
sensor with 100 ppm is 2.0 VDC.
NOTE:
Values for
Calibration Span Gas
and
Sensor Range
in the
above equations must have the same Engineering Units (e.g., PPM, %
of LEL, % vol, etc.).
