Det-Tronics MOS H2S Gas Sensor - Manual (Page 7)

95-8532 1.4 5
5. Attach the sensor to the other entry on the transmitter
enclosure. First route the wires through the entry,
then tighten the sensor to the enclosure to ensure an
explosion-proof installation. Do not overtighten.
IMPORTANT
To ease maintenance, periodically apply a
generous amount of silicone free grease (part
number 005003-001) to the internal threads on the
junction box cover using an application tool. DO
NOT use other lubricants, since some materials
can cause irreversible damage to the sensing
element in certain gas sensors.
6. Slide the transmitter module into the bracket,
being careful to route field and sensor wires to the
appropriate location within the enclosure for easy
connection to the transmitter module. Ensure that
the transmitter display and pushbuttons (at the top)
are oriented correctly.
CAUTION
Wires can become pinched between the cover
and base if they are not properly tucked down
inside the enclosure.
7. Fasten the transmitter module to the mounting
bracket with the two captive screws located inside
the notch on either side of the top of the transmitter.
Remove the wire clip and set it aside.
8. See Figures 4 and 5 for field wiring terminal
designation.
Attach the sensor plug to the transmitter module on
the side opposite the field wiring terminals.
9. Connect the power and current output leadwires to
the screw terminals on the plug that is provided.
See Figures 6 and 7 for examples of transmitter
wiring.
Connect the shield to earth ground at the power
supply. Under normal conditions, the panel or field
end of the shield should not be grounded at the
transmitter.
10. Refer to Figures 6 and 7 when connecting external
loads to relay outputs.
IMPORTANT
Direct connection of 120/240 vac to the relay
terminals inside the transmitter enclosure is not
recommended, since switching relay contacts
can induce electrical noise into the electronic
circuitry, possibly resulting in a false alarm or other
system malfunction. If the application requires
that AC powered equipment be controlled by the
transmitter, the use of externally located relays is
recommended.
GND
BRING FIELD WIRING TO TOP
FIELD WIRING ENTERS
FROM RIGHT SIDE
SENSOR PLUGS INTO
MODULE HERE.
PLUG IS KEYED TO PREVENT
IMPROPER INSTALLATION.
BRACKET
B1688
SENSOR
GND
BRING FIELD WIRING TO TOP
SENSOR PLUGS INTO
MODULE HERE.
PLUG IS KEYED TO PREVENT
IMPROPER INSTALLATION.
SENSOR
FIELD WIRING ENTERS
FROM LEFT SIDE.
NOTE THAT BRACKET
MUST BE ROTATED 90ϒ.
Figure 3—Field Wiring Entries and Transmitter Bracket Orientation
FLT RELAY
S POWER
RESET
PW
IN
NO COM NC
–
+
CAL
* SPARE
POWER
COMMON
POWER
+ 24 VDC
EXTERNAL
RESET
NOT USED
NOT USED
S
POWER OUT
–
+
+
–
* SPARE
POWER
COMMON
POWER
+ 24 VDC
+ 4 TO 20 MILLIAMPERE
OUTPUT SIGNAL
– 4 TO 20 MILLIAMPERE
OUTPUT SIGNAL
* THE SPARE TERMINALS ARE CONNECTED TOGETHER INTERNALLY
AND ARE NOT CONNECTED TO ANY OTHER TERMINALS INTERNALLY
B1905 THESE TERMINALS ARE CONNECTED INTERNALLY
**
**
**
Figure 4—Field Wiring Terminals, Transmitter without Relays