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Model 2002 page 37
4-20 mA Interface Option Board
SECTION 8
The Relay option board in the Model 2002 operates off of the setpoints defined by the user and
programed into the Model 2002 microprocessor. For more information about configuring these
setpoints refer to Section 3 of this manual.
The 4-20 mA interface board is available as an option for the Model 2002. This board provides
dual current channels linearly proportional to the HPM 2002’s pressure reading. Please note that
use of the Model 2002 with this option requires a CPU with firmware for version 1.6 or later.
8.1 4-20 mA Interference Connector Pin Assignmets
Pin Connection
1 Internal loop power out (+) channel 1.
3 Loop in (-) channel 1.
8 Internal loop power out (+) channel 2.
7 Loop in (-) channel 2.
The 4-20 mA board can only be operated with internal loop power.
A schematic (Figure 8.2) is attached to show the proper method to wire into a loop.
Symptom:Symptom:
Symptom:Symptom:
Symptom: Fixed display, regardless of pressure
Action:Action:
Action:Action:
Action: 1. Check sensor for contamination.
Figure 8.1
Model 2002
Rear Panel Detail
LOW SETPOINT OPTION BOARD HIGH SETPOINT
RELAY CONNECTOR (MALE) RELAY
TRANSDUCER CONN. STANDARD
(FEMALE) I/O CONNECTOR