Det-Tronics UD20 - Page 10

4.1 95-86208
B2691
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
V +
V –
POWER SUPPLY
Figure 8—PIRECL Detector Wired to UD20 (Isolated 4-20 mA Output, Sourcing, 4-Wire)
Figure 9—UD20 with Bartec Self-Regulating Heating Cable System
A2693
NON-HAZARDOUS LOCATION CLASS I, DIV. 2 HAZARDOUS LOCATION
HEATER
POWER SUPPLY
GAS DETECTOR
POWER SUPPLY
GAS DETECTOR
CONTROL
GAS
DETECTOR
BARTEC HEATER
JUNCTION BOX
UD20
HEATER CABLE
HEATER JACKET
TEMP CONTROL LIMIT
MAXIMUM = 20°C