Det-Tronics MOS H2S Gas Sensor User Manual

Page 9

95-8532

1.4

External relays, solenoids, motors, or other devices

that can cause inductive transients should be transient

suppressed. Place a diode across the coil for DC

devices. See Figure 8.

11. An external reset switch can be wired as shown

in Figures 6 and 7. The use of shielded wire is

recommended for wiring the switch.

12. Check all field wiring to ensure that the proper

connections have been made. Refer to local codes

to be sure wiring and conduit seals are installed

properly.

CAUTION

Wires can become pinched between the cover
and base if they are not properly tucked down
inside the enclosure. The wire clip will prevent this
problem when installed correctly.

13. Replace the wire clip and place the cover back on

the transmitter enclosure.

CONTROLLER/SIGNaL RECEIVER OpTIONS
The U9500B transmitter offers an analog 4 to 20 ma

output, which is configurable for electrically isolated or

non-isolated operation. The analog signal is capable

of driving a maximum 600 ohm resistance load. The

U9500B is typically used with R8471 Controllers. It is

also acceptable to use the U9500B with other devices

or systems capable of accepting 4 to 20 ma signal

inputs. The following illustrations provide examples

of recommended interconnecting wiring between the

U9500B and analog signal receivers:

Figure 9 — A Typical System, Infiniti Transmitter

Wired to R8471 Controller, Non-Isolated

Current Output

Figure 10 — A Typical System, Infiniti Transmitter

used with PLC Analog Input Module,

Isolated/Non-Isolated Current Output

AUX RELAY LOW RELAY HIGH RELAY NC COM NO NC COM NO NC COM NO

FLT RELAY

S POWER

RESET

NO COM NC

–

CAL

POWER OUT

–

B2085

–

24 VDC

EXTERNAL

RESET

4 TO 20 MA

FAULT RELAY CONTACTS

SEE NOTES 2, 3

HIGH ALARM RELAY CONTACTS

SEE NOTES 2, 4

LOW ALARM RELAY CONTACTS

SEE NOTES 2, 4, 5

AUXILIARY ALARM RELAY CONTACTS

SEE NOTES 2, 4, 5

NOTE 1

THE SENSOR CONNECTS TO A PLUG ON THE OPPOSITE SIDE

OF THE TRANSMITTER FROM THE ELECTRICAL TERMINALS.

NOTE 2

ALL RELAY CONTACT DESIGNATIONS INDICATE RELAY STATE

WITH NO POWER APPLIED — RELAYS DE-ENERGIZED.

NOTE 3

WITH POWER APPLIED AND NO FAULTS DETECTED,

THE FAULT RELAY IS NORMALLY ENERGIZED.

NOTE 4

ALARM RELAYS ARE PROGRAMMABLE AS A GROUP

TO BE EITHER NORMALLY ENERGIZED OR NORMALLY DE-ENERGIZED

WITH NO ALARMS DETECTED. REFER TO THE "SET-UP"SECTION OF THIS MANUAL.

NOTE 5

LOW AND AUXILIARY ALARM RELAYS ARE PROGRAMMABLE

AS A GROUP TO BE LATCHING OR NON-LATCHING.

NOTE 6

THESE TERMINALS ARE CONNECTED INTERNALLY.

SEE NOTE 6

SEE NOTE 1

MOS H2S SENSOR

NOT USED

Figure 7—A Typical System - Infiniti Transmitter with Non-Isolated Current Output and Relay Outputs

RELAY

SOLENOIDS

MOTORS

INDUCTION DEVICES

1N4004

TYPICAL

B0179

POSITIVE

NEGATIVE

MOV

HOT

NEUTRAL

120 VOLT – V13OLA10A

220/240 VOLT – V275LA20A

TYPICAL

{ }

–

DCV LOADS

A0179

Figure 8—Transient Suppression for Inductive Loads