CuRRENT (4-20 mA) OuTPuT OPERATION
An external power supply delivering 10-30 VDC with minimum current capability of
40 mA DC (per transmitter) is required to power the control loop. See Fig. A for
connection of the power supply, transmitter and receiver. The range of appropriate
receiver load resistance (R
L
) for the DC power supply voltage available is
expressed by the formula:
Shielded cable is recommended for control loop wiring.
Conduit Housing with 4-20 mA Output (-CH)
Electrical connections to the
pressure transmitters are made to the terminal block located inside the housing.
Remove the screws and lift off the cover. Wire as shown in Fig. A, B or C. Use Fig.
A for current output connection. Use Fig. B for current output with optional LED
display. Use Fig. C for current output with optional LED display using two power
supplies.
If ordering optional pre-wired cable, black wire is negative (-) and red wire is
positive (+).
SPAN
ZERO
PRESS AND HOLD TO
ZERO THE DISPLAY
PRESS TO
DISPLAY
THE GAGE’S
PRESSURE
RANGE
YELLOW
LED DISPLAY CONNECTOR
TERM 1 (+)
TERM 2 (-)
TERM 4 (+)
OPTIONAL LED DISPLAY
RECEIVER
mA
LED DISPLAY
POSITIVE SUPPLY
10-30 VDC
(140 ma)
POWER
SUPPLY
+
-
TRANSMITTER CONNECTION:
- TURN OFF POWER
- CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAGE AS SHOWN
- CONNECT POWER SUPPLY (+) TO
TERMINAL 4 (REQUIRED FOR THE
OPTIONAL DISPLAY ONLY)
- INSTALL THE DISPLAY’S CONNECTOR
- TURN ON POWER
BE SURE TO TURN OFF POWER WHEN
CONNECTING OR REMOVING THE
DISPLAY’S CONNECTOR. FAILURE TO DO
SO CAN RESULT IN THE GAGE DAMAGE.
R
L
Max = Vps – 10
20 mA DC
1 RED
2 BLACK
3 (NC)
4 (NC)
+ RECIEVER -
mA
PRESSURE
TRANSMITTER
POWER
SUPPLY
10-30 VDC
Fig. A: Current output connection
Current Output
Fig. B: Current output with optional LED display connection
Fig. F: Packard Connection
SPAN
ZERO
PRESS AND HOLD TO
ZERO THE DISPLAY
PRESS TO
DISPLAY
THE GAGE’S
PRESSURE
RANGE
LED DISPLAY CONNECTOR
YELLOW
OPTIONAL LED DISPLAY
10-30 VDC
(40 ma)
10-30 VDC
(100 ma)
+
-
+
-
RECEIVER
mA
LED DISPLAY
NEGATIVE SUPPLY
LED DISPLAY
POSITIVE SUPPLY
TERM 1 (+)
TERM 2 (-)
TERM 3 (-)
TERM 4 (+)
BE SURE TO TURN OFF POWER WHEN
CONNECTING OR REMOVING THE
DISPLAY’S CONNECTOR. FAILURE TO DO
SO CAN RESULT IN THE GAGE DAMAGE.
TRANSMITTER CONNECTION:
- TURN OFF POWER
- CONNECT THE POWER SUPPLY
AND RECEIVER TO TERM 1 AND
TERM 2 OF THE GAGE AS SHOWN
- CONNECT LED POWER SUPPLY (-)
TO TERMINAL 3
- CONNECT LED POWER SUPPLY (+)
TO TERMINAL 4
- INSTALL THE DISPLAY’S CONNECTOR
- TURN ON POWER
POWER
SUPPLY
LED SUPPLY
POWER SUPPLY
Fig. C: Current output with optional LED display using two power supplies
Fig. D
A
A
SECTION A-A
TERMINAL 1: (+)
TERMINAL 2: (-)
TERMINAL 3:
(GROUND)
TERMINAL 4: (-)
TERMINAL 1: (+)
T
Fig. E
Hirschman DIN Connector with 4-20 mA
When using cable version of -GH
General Purpose Housing, black wire is negative (-) and red wire is positive (+).
When using optional Hirschman DIN Plug, remove top-center screw and lift off the
terminal block assembly. Wire to terminals shown below in Fig. D. For optional 4-
pin M-12 connector, wire to pins as shown in Fig. E.
B; [+]
C; [Vout +]
A; [-]
B; [+]
C; [GND]
A; [-]
3-5/16 [84.14]
7/8
[22.23]
HEX
1/4 NPT
Ø55/64
[21.83]
2-27/64 [61.52]
Current
Output
Voltage
Output
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