Anderson LA Series Руководство по эксплуатации - Страница 7

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2.3 TRANSMITTER ELECTRONIC "ZERO" CALIBRATION

Upon installation of a new Factory Calibrated unit, and as part of routine maintenance, a

Zero calibration adjustment must be performed. The transmitter ZERO, (signal output with

no pressure applied to the diaphragm), is 4.00 mA. Although the calibration may be

performed without additional tools, testpoints have been provided for monitoring the mA

output signal from the transmitter. For maximum accuracy we recommend performing a

sensor zero about three (3) weeks after initial installation, or following several heat/cool

cleaning cycles.

See Figure 2-4, Zero Calibration Procedure, for the location of the Zero switch. Depressing

for 5-8 seconds automatically "zeros" the output.

CAUTION:

• Field wiring MUST be complete – loop power (12-40 VDC) applied

• Transmitter MUST be installed in vessel

• Verify NO product contact to diaphragm

• Vessel MUST be vented to atmosphere

• DO NOT depress SPAN switch

• MODE switch set to RUN MODE

Once Zero calibration has been performed, sensor output will return to 4.00 mA. This is the

proper output to signify an empty vessel – ZERO calibration is complete.

NOTE:

No adjustment to the SPAN is necessary. ZERO and SPAN settings are non-

interactive, having no effect on each other.

NOTE: RECEIVER AND METER CONNECTIONS

SHOWN WITH

CAP REMOVED

OMITTED FOR CLARITY

REFER TO FIGURE 2-3 FOR HOOKUP

DEPRESS

ZERO/-

SWITCH

TO INITIATE ZERO CALIBRATION

HOLD FOR 5-8 SECONDS TO

COMPLETE ZERO CALIBRATION

MODE SWITCH

SET TO RUN MODE

AGE