Manuals / Teledyne / Household Appliance / Carbon Monoxide Alarm

Teledyne 300 3.7Remote zero/span check or adjustment RS-232, Power-onhold off, Hold off

Models: 300

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3.7Remote zero/span check or adjustment (RS-232)

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.

3.7Remote 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-VARSand 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.

P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 38

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Teledyne 300 instruction manual 3.7Remote zero/span check or adjustment RS-232, Power-onhold off, Hold off
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FAQ

What is the purpose of remote zero/span adjustment?

The remote zero/span adjustment alters the formulas used to compute the carbon monoxide readings, but it is not approved by USEPA and should not replace the USEPA approved calibration.

How does the RS-232 interface support remote zero/span checks?

The RS-232 interface allows for remote checking of zero, span, and zero followed by span checks, similar to the remote check via contact closure inputs. This feature is designed to be used by a host computer at another location to control the Analyzer. Refer to Section 7.0 for detailed information on using the RS-232 interface.

What is the purpose of the hold off period after a check or adjustment?

The hold off period, ranging from 1 to 20 minutes, prevents the internal data acquisition system from accumulating CO readings into the average. To change the hold off time setting, follow the instructions in Section 3.9 of the manual.