AMC-1228 Multidrop
5
3
PRODUCT DESCRIPTION
In this section a general product description is given followed by a detailed list of the AMC-1228
unit's internal features.
3.1 GENERAL DESCRIPTION
The AMC-1228 sensor unit provides continuous, reliable surveillance of surrounding air for
traces of hazardous gases (listed in section 2.2 FACTORY CALIBRATION, page 4). This unit is
designed to allow interconnection in series as in a "daisy chain" configuration (refer to Figure 2)
to a single or multi-channel AMC 1AD Series monitor or so equipped inputs of other AMC
monitors. A maximum of eight (8) sensor modules can be connected to each zone. The units
can also be branched out from the central line allowing maximum flexibility. Each unit produces
Low alarm, High alarm and sensor Fail signals, which are transferred from one sensor to the
next up the line back to the monitor.
3.1.1 INTERNAL
FEATURES
Each sensor module features alarm indicators, adjustment trimmers and connection terminal
blocks, as listed and described below.
1) SENSOR:
Electrochemical cell, factory calibrated.
2) HIGH ALARM INDICATOR:
High conditions of gas are indicated by a red LED.
3) LOW ALARM INDICATOR:
Low conditions of gas are indicated by a yellow LED.
4) POWER/FAIL INDICATOR:
Power is indicated by an illuminated green LED. A sensor
failure causes the green LED to turn OFF.
5) HIGH ALARM ADJUSTMENT:
Sets the high alarm trip point.
6) LOW ALARM ADJUSTMENT:
Sets the low alarm trip point.
7) SIGNAL ADJUSTMENT:
Sets the sensitivity of the sensor.
8) TERMINATING JUMPERS:
Jumper clips are supplied installed on the circuit card.
When connecting additional sensor modules, the jumper clip
corresponding to the terminal block must be removed.
Refer to section 4.2.2 TERMINATION, for more details.
9) OUTPUT TERMINAL BLOCK:
The output terminals (labeled –,s,+), connect to the (–,s,+)
terminals in the monitor, or to the input (–,s,+) terminals of
another sensor module.
10) INPUT TERMINAL BLOCKS:
The input terminals (–,s,+), are used to connect additional
sensor modules. Each unused input terminal block must be
locked-out using a terminal jumper (see item 8).
Summary of Contents for AMC-1228
Page 2: ......
Page 4: ...AMC 1228 Multidrop 2 ...
Page 8: ...AMC 1228 Multidrop 6 FIGURE 1 Internal Features of the AMC 1228 sensor module ...
Page 10: ...AMC 1228 Multidrop 8 FIGURE 2 Detail wiring of sensor modules ...
Page 11: ...AMC 1228 Multidrop 9 FIGURE 3 Typical system configuration layouts ...