GASMAX II Operation & Maintenance Manual, Revision 7.0
Page 8
The GASMAX II consists of a display assembly with optional
alarm relay interface, I/O power supply board,
sensor head body, sensor head cover and sensor.
The display assembly contains the microprocessor, LCD
display, magnetic switches, alarm indication LEDs and toxic
sensor interface electronics (Channel 1). The display connects
to the I/O power supply board via a short ribbon cable. This
cable should remain connected at all times. If a local toxic
sensor is connected to the G M II, it connects to the “ ”
connector on the back of the display.
If the GASMAX II is equipped with the optional
relay interface board, this board is mounted to the back of
the display using three extended length 4-40 screws. The
GASMAX II software automatically recognizes the presence of
the relay interface board if installed.
The display and optional relay interface board are
attached to the I/O power supply board using standoffs and
thumbscrews. To access the I/O power supply board, loosen
the thumbscrews and allow the display to hang by the ribbon
cable. This can be done without removing power to the unit.
The I/O power supply board is mounted on the back side of
the enclosure and provides power management, signal
output and bridge input circuitry. Connections for power
input and signal output on provided on the left-hand side
terminal strip and connections for a remote bridge sensor or
4-20mA input (Channel 2) are provided on the right-hand side
terminal strip.
There are four distinct I/O power supply board types. The
standard 10-0233 I/O board has channel 2 input type
configured for bridge sensors. The 10-0233-420 board has
channel 2 configured for 4-20mA input. The 10-0233-D4
board has dual 4-20mA inputs for both channel 1 and channel
2. The 10-0233-B4 board has channel 1 configured for 4-
20mA and channel 2 configured for bridge input. These
configurations are factory selected during manufacturing and
cannot be modified in the field.
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M E A S U R E M E N T N A M E
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Back view
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Display Front
Display Back
Optional relays
Mounts on display back
Sensor Head
Sensor Head Cover
Sensor Element
Enclosure with I/O power
supply board
Содержание GASMAX II
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Страница 58: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax ww gdscorp com ...