Teledyne Carbon Monoxide Analyzer 300 User Manual download pdf (Page 44)

NOTE

REMOTE ZERO AND SPAN ADJUSTMENT ALTER THE

FORMULAS USED TO COMPUTE THE CARBON

MONOXIDE READINGS IF DYN_ZERO OR DYN_SPAN ARE

ENABLED. THIS METHOD OF CALIBRATION IS NOT

APPROVED BY USEPA AND IS NOT INTENDED TO

REPLACE THE USEPA APPROVED CALIBRATION.

3.7 Remote zero/span check or adjustment

(RS-232)

Besides Z/S checking from the front panel, automatic Z/S checking, and remote Z/S

checking via the contact closure inputs, the Analyzer can also be checked via the RS-232

interface. Remote checking via the RS-232 interface supports zero, span, and zero

followed by span check, and is identical to remote check via the contact closure inputs.

This RS-232 control feature is provided mainly so that a host computer at another

location can control the Analyzer. See Section 7.0 for detailed information on using the

RS-232 interface to do a remote Z/S check.

3.8 Power-on hold off

Whenever the Model 300 is powered on it will go through a HOLD-OFF sequence (see

Section 3.10 below) like it does after a zero/span check.

3.9 Hold off

Every type of check or adjustment (zero, span, manual, remote, etc.) is followed by a

hold off period of from 1 to 20 minutes, during which time the internal data acquisition

system (DAS) does not accumulate CO readings into the DAS average. To set the hold

off time, press SETUP-MORE-VARS and press NEXT until the variable

HOLDOFF_TIME is displayed. To change the setting, enter a number from 1 to 20 and

then press ENTR to store the new value or EXIT to leave the hold off time unchanged.

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Teledyne Carbon Monoxide Analyzer 300 User Manual Page 44