Description – Det-Tronics MOS H2S Gas Sensor User Manual

Page 5

95-8532

1.4

IMPORTANT SAFETy NOTES

WARNING

Do not apply power to the system with the
enclosure cover removed unless the area has
been de-classified. Do not open the enclosure in a
hazardous area when power is applied.

CAUTION

The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with applicable regulations that relate to the
installation of electrical equipment in a hazardous
area. If in doubt, consult a qualified official before
wiring the system.
The Infiniti contains semiconductor devices
that are susceptible to damage by electrostatic
discharge. An electrostatic charge can build up on
the skin and discharge when an object is touched.
Therefore, use caution when handling the device,
taking care not to touch the terminals or electronic
components. Observe the normal precautions for
handling electrostatic sensitive devices.

To minimize the risk of damage, handle the
transmitter module by the edges only. Do not
touch the circuit board, or electronic components.
The fault detection circuitry does not monitor the
operation of external response equipment or the
external wiring to these devices. It is important that
these devices be checked periodically to ensure
that they are operational.
Exercise caution if an over-range reading is
indicated, since a dangerous condition could exist.
The hazardous area should be checked with a
portable detection instrument to determine the
actual level of gas present.

DESCRIPTION

The U9500B is a single channel gas signal transmitter.

In addition to the standard 4-20 ma analog signal output,

the U9500B offers 4 optional relay outputs for fault and

alarm indications. The 4 outputs are: fault, high alarm,

low alarm, and auxiliary alarm. The relays have form C

(SPDT) contacts. The high alarm relay is always latching,

while the user can select, as a group, whether the auxiliary

and low alarm will also latch. During normal operation,

the fault relay is non-latching, but for initialization faults,

the fault relay latches. The alarm relays will also be

selectable, as a group, for normally energized or de-

energized with no alarms. The fault relay is always

normally energized for no fault.

NOTE

Since the relays can be programmed to be either
energized or de-energized on alarms, the term
“actuate” is used to indicate that the output is in an
alarm condition.

The U9500B provides an eight character, single line,

alpha-numeric LCD display. The U9500B has four

switches located on the display. The visible three switches

are single pole, normally open push buttons, and are

designated as: Setup\accept, increase, and decrease.

The fourth switch is a magnetic reed switch, designated

cal/reset, which is used by the customer for non-intrusive

calibrations and for resetting of the U9500B.

2.0

(5.2)

1.5

(3.8)

1.7

(4.4)

3/4 INCH

STANDARD PIPE THREAD

OR M20

E1213

Figure 1B—Dimensions in Inches (Centimeters)

of MOS H

S Sensor (CSA)

2.375

(6.0)