Connect loop power between the connections labeled
8-28 Vdc and RTN. Connect the protective conductor
wire to the terminal with the symbol. A zero
pushbutton is also included. Zero the transmitter
with the transmitter powered and no differential
pressure applied by depressing the switch for a
minimum of 2 seconds.
The maximum loop resistance is 1000 ohms (@
28Vdc Input). Use the following formula to
determine the maximum loop resistance at other
input voltages:
((Vs – 8) *1000)/ 20
The interface schematic shows an implementation of
the Remote Zero function. The supplied unit
incorporates an internal pushbutton for zeroing the
unit locally (non-hazardous locations only "T"
electrical configuration).
Occasionally the transmitter may require a “re-zero” .
The “re-zero” may be necessary due to stray
magnetic fields or a large change in temperature
from when the unit was originally calibrated.
Warning: If zeroing in the Hazardous Location
environment use a switch approved for that
location.
Occasionally the transmitter may require a “re-zero” .
The “re-zero” may be necessary due to stray
magnetic fields or a change in temperature from
when the unit was originally calibrated.
Trouble Shooting
1. Switch doesn't function. (Assuming Indication is good)
i. Make sure that the switch load does not exceed the
specified wattage rating of the switch. (steady-
state and transient). Contact factory for assistance
for excessive loads, otherwise proceed to the next
step.
ii. Perform a continuity check of the switch contacts
by trying to actuate the switch using an external
magnet. An operational switch usually indicates a
problem with the gauge. If not operational proceed
to the next step.
iii. Verify the reed switch wires are connected to the
terminal strip (NEMA 4X enclosure only). Contact
the factory for assistance if the switch is connected
and/or request an "RGA" number.
2. Transmitter doesn't function
A. Make sure you have supplied power (proper
voltage) to the unit.
B. Check that you are wiring to the correct
Interface terminals.
C. Check the transmitter interfaces to the terminal
board for loose connections.
D. Make sure that the loop resistance does not
exceed the specified rating.
3. Gauge accuracy and set point problems:
i. Verify gauge is not in an electromagnetic /
magnetic environment. i.e.; close proximity to high
current power lines.
ii. All others, contact the factory for assistance.
4. When contacting the factory please have the following
information available if possible:
1. Gauge / Switch Serial Number
2. Model Number of the Gauge / Switch
3. Description of the problem and events prior to
failure.
4. Interface Information such as switching voltage,
switching current, cable lengths, etc.
R
Loo
To Transmitter
8-28 Vdc Pin 3
To Transmitter
GND Pin 1
Interface Schematic
8-28Vdc
To Transmitter
Zero Pin 2
4-20 ma
3
2
1
DP Transmitter
Customer Interface
1
2
3
1
Zero switch not present for hazardous locations product
2 Optional remote zero (customer supplied)
3 Loop Resistor can be located in the ground leg
(12 pages)
(2 pages)
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