Teledyne 9700 - Flue gas analysis system - Manual (Page 34)

4-6
4 Operation Model 9700
TELEDYNE BROWN ENGINEERING
Analytical Instruments
(6) After air has been flowing for a couple of minutes, adjust the
ZERO control on the control unit (use the small screwdriver
supplied) until the meter pointer lines up with the zero mark on
the dial (be sure that the mechanical zero of the meter is first
adjusted with the power off.)
(7) Turn on supply of span gas and open the SPAN toggle valve.
Then adjust the SPAN flow control valve until a flow rate of
2–3 SCFH is indicated on the right hand flowmeter.
Note: Flow rate of span gas should be set to match that of the air as
closely as possible. It does not matter what they read as long as
they are both the same.
(8) Adjust the SPAN control with the small screwdriver until the
meter pointer reads the analyzed value ot the span gas.
(9) If only a very small or no adjustment was required, no further
calibration should be needed. If, however, a fairly large
adjustment was made, the ZERO adjustment should be
rechecked and readjusted, as necessary. If ZERO readjustment
was made, check the SPAN adjustment again.
(10) Adjust alarm setpoint to the desired level. The alarm is
adjusted by turning ZERO control until the meter reads the
desired alarm point. The ALARM level control is then adjusted
until the alarm light just comes on. The ZERO control must
then be reset to produce a zero reading.
(11) Once the above adjustment has been made, the unit is ready
for service.
(12)After calibration is completed, re-establish sample flow and be
sure the flow rate is set to match that which was used for span
gas.