Dwyer HADP - Manual (Page 3)

Adjustments for Zero and Sensitivity
Adjustments for Voltage Output Pressure Transmitters (cover must
be removed)
TURN OFF EXCITATION POWER DURING COVER
REMOVAL OR REPLACEMENT
Zero Pressure Output
Can be adjusted to zero by potentiometer as shown in diagram. Unit
factory adjusted to zero output (±10 mV).
Sensitivity (span)
Can be adjusted by potentiometer as shown on outline diagram. Unit
factory adjusted to order specifications.
Linearity - DO NOT TOUCH
Factory adjusted for best linearity. Touching any adjustments other than
zero output or sensitivity may necessitate recalibration.
Note: Sensitivity (span) adjustment is not recommended unless a
primary pressure standard (dead weight tester, etc.) is available for use
as a reference.
Adjustments for Current Output Pressure Transmitters (cover must
be removed)
Zero Pressure Output
Zero output can be adjusted ±0.2 mA about the nominal 4 mA. The zero
adjustment is the potentiometer shown in the diagram. Changing zero
will not change span.
Sensitivity (span)
Sensitivity can be adjusted approximately ±5 mA from the nominal 16
mA full scale span. The sensitivity adjustment potentiometer is located
as shown in the diagram and may be adjusted without affecting linearity
calibration.
Linearity - DO NOT TOUCH
Factory adjusted for best linearity. Touching any adjustments other than
zero output or sensitivity may necessitate recalibration.
Note: Sensitivity (span) adjustment is not recommended unless a
primary pressure standard (dead weight tester, etc.) is available for use
as a reference.
MAINTENANCE
Upon final installation of the Series HADP Differential Pressure
Transmitter, no routine maintenance is required. A periodic check of
system calibration is recommended. The Series HADP is not field
serviceable and should be returned if repair is needed (field repair should
not be attempted and may void warranty). Be sure to include a brief
description of the problem plus any relevant application notes. Contact
customer service to receive a return goods authorization number before
shipping.
CAUTION
P-HADP:SSS-1000 12/27/10 3:46 PM Page 3