• Calibration Gas
• Meter capable of monitoring the output, in milliamps.
Calibration Check Procedure
The calibration procedure involves checking the SPAN and ZERO
readings on the instrument.
During the calibration check procedure, any control instrumentation
connected to the Chillgard LS Refrigerant Monitor may activate.
Disconnect or disable any equipment or alarms connected to the
monitor during the calibration procedure.
Applying Calibration Gases to the Instrument
Arrange Span and Zero gas cylinders with regulator, tubing, and cal cap
as shown in FIGURE 4-2.
1. Connect the mA current meter to the instrument output, terminals
(+) and (-).
During calibration, the Chillgard LS Refrigerant Monitor is not sampling
and monitoring the intended area. Exercise caution in the area as
appropriate.
2. Connect the ZERO gas cylinder to the sample tubing.
3. Open the regulator valve to allow the ZERO gas to flow freely to
the instrument. Supply the instrument with gas for at least five
minutes. If the reading on the multimeter differs significantly from
the zero (4.0 mA) reading obtained during the initial calibration
procedure, perform the “Initial Calibration” procedure again.
4. Close the regulator valve and remove the ZERO gas cylinder from
the sample tubing.
5. Connect the 100 ppm gas cylinder to the sample tubing.
6. Open the regulator valve to allow the SPAN gas to flow freely
to the instrument. Supply the instrument with gas for at least
five minutes. If the reading on the multimeter differs significantly
from 100 ppm (5.6 mA), perform the “Initial Calibration” procedure
again.
7. Close the regulator valve and remove the SPAN gas cylinder from
the sample tubing.
8. Remove tubing and calibration cap from the sensing cell on the
unit.
"
CAUTION
4-5
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