Det-Tronics U9500 Infiniti Gas Transmitter - Manual (Page 14)

95-8444 12 10.1
DISPLAy AND CONTROLS, OPTIONS,
DEFAULTS
DISPLAY AND CONTROLS
The Infiniti display contains an eight character display
for identifying system status conditions and sensor
input, a magnetic reed switch for resetting the unit and
entering different operating modes, and pushbuttons for
programming and calibrating the system. See Figure 18
for the location of indicators and pushbuttons and Tables
3 and 4 for descriptions.
External Reset
The external reset input terminal, when grounded
momentarily, normally initiates a relay/display reset only.
See Figure 9. However, if the “EXT” “CAL” option is
programmed “YES” during the Infiniti setup procedure,
the external reset duplicates the magnetic reed switch
(Cal Magnet) and can be used to perform calibration.
PROGRAMMING OPTIONS
Operating Range
The available operating range settings and the
corresponding default setpoints and calibration gases
are shown in Table 5. Note that not all U9500s support
selectable operating range.
iMPOrTanT
The range setting of the transmitter must match
the output range of the sensor being used or the
system will fail to operate correctly. For example,
if a carbon monoxide (CO) sensor with a range of
0 to 500 ppm is being used, the range setting for
the transmitter must be 0 to 500 ppm. Refer to the
“Specifications” section for a listing of available
sensors and ranges.
24 VDC +
POWER SUPPLY
4 TO 20 MILLIAMPERES
INFINITI TRANSMITTER JUNCTION BOX
GROUND SCREW
TWO CONDUCTOR
SHIELDED CABLE
(CONNECT AT THE
TRANSMITTER
JUNCTION BOX ONLY)
+
+
–
–
PO
WER OUT
NO
COM
NC
NO
COM
NC
NO
COM
A
UX RELA
Y
LO
W RELA
Y
HIGH RELA
Y
NC
NO
COM
NC
S
–
+
S
–
–
+
+
RESET
CA
L
FA
UL
T RELA
Y
PO
WER
PW
IN
B2310
* CONNECT THE GREEN
SENSOR LEAD TO THE
CHASSIS GROUND LUG
IN THE INSIDE BOTTOM
OF THE JUNCTION BOX.
TOXIC SENSOR
SENSOR TERMINATION BOX
RED
BLK
NO CONNECTION
+
+
G
G
–
–
GROUND LUG *
Figure 16—Sensor Separation with Toxic* and Oxygen Gas Sensors
and Infiniti Transmitter
* Excluding Chlorine sensor, see Figure 17.
24 VDC +
POWER SUPPLY
4 TO 20 MILLIAMPERES IN
SEE NOTE 1
SAFE AREA
HAZARDOUS AREA
SENSOR POWER ( + )
MTL 787S
I.S. BARRIER
+
–
PO
WER OUT
A
UX RELA
Y
LO
W RELA
Y S
–
+
S
–
–
+
+
RESET
CA
L
PO
WER
PW
IN
2 1
3 4
INFINITI TRANSMITTER OR
R8471 CONTROLLER
NOTES:
1. NEVER EXCEED 25.5 VOLTS DC POWER SUPPLY INPUT VOLTAGE OR
BARRIER DAMAGE WILL RESULT.
2. MAXIMUM TOTAL FIELD WIRING SIGNAL LOOP IMPEDANCE IS
130 OHMS (EXCLUDING BARRIER).
3. INTRINSICALLY SAFE WIRING AND INSTALLATION PRACTICES MUST BE FOLLOWED.
4. INTRINSICALLY SAFE BARRIERS ARE NOT COMPATIBLE WITH “GROUND-FAULT”
MONITORED POWER SUPPLIES.
5. INTRINSICALLY SAFE BARRIER MAY BE FIELD INSTALLED WITHIN AN
APPROVED JUNCTION BOX. B2311
SENSOR TERMINATION BOX
RED
BLK
* CONNECT THE GREEN
SENSOR LEAD TO THE
CHASSIS GROUND LUG
IN THE INSIDE BOTTOM
OF THE JUNCTION BOX.
NO CONNECTION
+
+
G
G
–
–
GROUND LUG *
C7067E
CHLORINE
SENSOR
Figure 17—Sensor Separation with Chlorine Gas Sensor, Intrinsically
Safe Barrier and Infiniti Transmitter