Det-Tronics UD20 - Page 8

4.1 95-86206
B2688
24 VDC –
24 VDC –
24 VDC +
24 VDC +
CALIBRATE
+ 4-20 MA
– 4-20 MA
1
2
3
4
5
6
7
PIRECL
POINTWATCH ECLIPSE
NOTE 1 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 2 THE TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 440 OHMS MAXIMUM.
UD20
DISPLAY UNIT
SENSOR +
POWER +
SENSOR –
POWER –
SHIELD
SHIELD
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
V +
V –
SIGNAL
250Ω
3 WATT
ANALOG INPUT / POWER
Figure 5—PIRECL Detector Wired to UD20 (Non-Isolated 4-20 mA Output, Sinking, 4-Wire)
+
–
24 VDC
UD20 DISPLAY UNIT
B2483
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE END ONLY.
NOTE 2 250 OHM, 3 WATT RESISTOR REQUIRED (INCLUDED).
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE CONNECTED ACROSS
THE 250 OHM RESISTOR, ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTE 1
SEE NOTES 2 AND 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLACK
BLACK
GREEN
+
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
Figure 4—Basic Wiring for Explosion Proof UD20 and GT3000 with Terminal Box