RKI Instruments SDM-2012 Standalone Configuration - Manual (Page 80)

75 • Calibrating a Gas Tracer
Calibrating a Gas Tracer
The following instructions apply to standard Gas Tracers that contain the standard
sensors (catalytic LEL, ppm combustible, O
2
, and CO). They also apply to Gas
Tracers that have a %volume combustible gas sensor installed. See “Calibrating a
GX-2012” on page 48 for instructions to calibrate a GX-2012.
When a calibration is performed, the docking station performs a fresh air adjustment
on an instrument and then applies calibration gas to the instrument. The docking
station analyzes the calibration results and determines if the instrument passed the
calibration.
The SDM-2012 will calibrate the ppm sensor using the Gas Tracer’s WET setting for
both the fresh air adjustment and the gas application. If the SDM-2012 is not in a
fresh air environment, a zero air cylinder must be used with a 6 inch humidifier tube
connecting the cylinder to the AIR fitting. Another 6 inch humidifier tub must always
be used to connect the ppm calibration cylinder to the GAS 2 fitting. See the Gas
Tracer Operator’s Manual for a description of the DRY and WET settings for bump
testing and calibration.
NOTE: The SDM-2012 performs a complete calibration on the ppm
combustible sensor first. Be sure that the 1000 ppm methane
calibration cylinder is connected to the GAS 2 fitting on the back of the
SDM-2012.
To perform a calibration on a Gas Tracer:
1. Confirm that the AC Adapter is connected to the SDM-2012 and to an AC wall
socket.
2. Press and hold the SDM-2012’s POWER button. The LEDs will turn amber.
3. When the BUMP
T
and CAL
S
LEDs turn off, release the POWER button.
4. The COPY LED will be off or on steadily and the CHARGE LED will be blinking
green if the SDM-2012 is operating properly or solid red if there is a system
failure. The amount of free memory in the SDM-2012 will dictate the condition
of the COPY LED (see “Available Memory in the SDM-2012” on page 92).
5. Install a Gas Tracer into the instrument cradle. The plastic flap should be
covering the recess not in use. Flip the plastic flap over if it is covering the
recess you need to use.
6. Connect the gas out to instrument line to the inlet fitting on the Gas Tracer.