RKI Instruments Gas Tracer - Manual (Page 69)

Gas Tracer Operator’s Manual SDM-2012 • 61
SDM-2012
The Gas Tracer can be used with the SDM-2012 if desired. The SDM-
2012 can charge the instrument if the lithium ion battery pack is being
used. It can also bump test, calibrate, and retrieve saved data. The
SDM-2012 can be operated as a single, stand-alone unit or can be used
with up to 9 other SDM-2012s and operated using a computer. For
more information about the operation of the SDM-2012, see the SDM-
2012 operator’s manual.
Calibration Mode
Calibration mode allows you to calibrate the Gas Tracer’s sensor
response, bump test the unit, and calibrate the PPM sensor.
CAUTION: BEFORE EACH DAY’S USAGE, SENSITIVITY IN THE
% LEL RANGE MUST BE TESTED ON A KNOWN
CONCENTRATION OF THE COMBUSTIBLE TARGET
GAS, METHANE, EQUIVALENT TO 25 - 50% OF FULL
SCALE CONCENTRATION (The % LEL full scale is
100% LEL). ACCURACY MUST BE WITHIN -0 to + 20%
OF ACTUAL. ACCURACY MAY BE CORRECTED BY
FOLLOWING THE CALIBRATION INSTRUCTIONS FOR
THE COMBUSTIBLE CHANNEL BELOW.
If the combustible channel passes the above response test and does
not require calibration, the unit should still be calibrated periodically.
The optimum frequency of calibration depends heavily on how the
Gas Tracer is used. For example, instruments used daily may need to
be calibrated weekly or monthly, while instruments that are used only
a few times a year may need to be calibrated before each use. Typical
calibration frequencies range from monthly to quarterly. Make sure to
perform the combustible channel response test as described above
and make sure to develop a calibration schedule tailored to your
application that takes this test and required calibration resulting from
this test into account.
You can program the Gas Tracer to notify you when it is due for
calibration. See “Updating the Calibration Reminder Setting” on
page 162.