Bently Nevada 3500/32M 149986-02 Power interface monitor 125720-01

Description

To avoid damage, observe the
following precautions in the order given.
Application Advisory
Gas detection will be disabled when
this module is removed from the rack.
• Do not discharge static electricity onto the circuit board. Avoid tools or
procedures that would subject the circuit board to static damage. Some
possible causes include ungrounded soldering irons, and nonconductive
plastics and similar materials.
• Personnel must be grounded with a suitable grounding strap (see Section
11.11 for ordering information, on page 128) before handling or
maintaining a printed circuit board.
• Transport and store circuit boards in electrically conductive bags or foil.
• Use extra caution during dry weather. Relative humidity less than 30%
tends to multiply the accumulation of static charges on any surface.

The hazards of gas exposure are generally categorized as combustible,
toxic, or oxygen deficient. In many industrial facilities methane and
hydrogen are the combustible gases of concern. The Hazardous Gas
Detection System detects the presence of these combustible gases,
protecting property and personnel.
The lower concentration at which a particular gas will support combustion
is called the Lower Explosive Limit (LEL). Below this concentration, the gas
is too lean to support combustion. There is a corresponding Upper
Explosive Limit above which the concentration is too rich to support
combustion.
The concentration at which a gas will explode depends on the gas. For
example, the LEL of methane is approximately 5.0 percent by volume in air
at 20 ⁰C, whereas the LEL of hydrogen is approximately 4.0 percent by
volume in air at 20 ⁰C. Note that “% LEL” is a common reference when
discussing the concentration of explosive gases. If a gas concentration
reaches 100% LEL, the gas is at its lower explosive limit and will explode if
an ignition source and oxygen are both present.
The Hazardous Gas Detection System consists of a sensor, a monitor (with
input/output (I/O) module) and an external power supply and is part of a
3500 Monitoring System. One monitor provides six channels of gas
3500/63 Hazardous Gas Detection Monitor Operation and Maintenance Manual
12
detection. You can screw sensors directly into conduit, or use the sensor
with the flameproof enclosure to simplify sensor replacement and field
wiring termination. Refer to Figure 2-2.
The hazardous gas detection system requires an external power supply
because of the large amount of current that each gas sensor requires (300
mA each, which exceeds what the rack power supplies can provide). The
external supply interfaces to each I/O card. The 3500/63 monitor regulates
the current and sends out the regulated current to each of the six sensors
via the I/O card.
The system can also include relay module(s) that you can program to
change state to enable trip or shutdown of machines or processes,
produce audible and/or visible alarms, or otherwise protect both human
life and machine assets.

Details: If you need urgent delivery orders, please feel free to contact us, and we will try our best to meet your needs.
Price problem: If you find that other suppliers offer cheaper prices for the same product, we are also willing to provide you with reference prices and give you further discounts.
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Contact Person: Chen

135785-01 3500/93 Display Unit, non backlighted
135785-02 3500/93 Display Unit, back-lighted
137412-01 3500/93 Manual
135799-01 3500/93 Display Interface Module
135799-02 3500/93 Display Interface Module
(use with A05 option only)
135813-01 3500/93 Display Interface I/O
Module
136634-0010-01 10 Foot (3 metres) Cable (PVC)
136634-0050-01 50 Foot (15 metres) Cable (PVC)
136634-0050-02 50 Foot (15 metres) Cable
(Teflon? )
136634-0100-01 100 Foot (30 metres) Cable (PVC)
136634-0100-02 100 Foot (30 metres) Cable
(Teflon? )
130121-02-01 500 Foot (152 metres) Extension
Cable (PVC)
130121-02-02 500 Foot (152 metres) Extension
Cable (Teflon? )
02200271 External Power Supply for 115 Vac
02200272 External Power Supply for 230 Vac
138227-01 Cable Adapter
146085-01 Power Cable
137224-01 System Mounting Assembly
(sheet metal for A01 & A05
options)
04309007 4-40 X 0.63 Phillips head screw for
System Mounting Assembly, 4 are
required