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Trip Amplifier |
This field
programmable instrument provides a voltage free contact which changes state
when the input signal passes an adjustable reference point. A single pole
change-over relay contact is provided. A single dual colour LED indicates both
tripped state and power on. Standard features include field programmable
input ranges and High/Low type trip selection. |
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COM-2 |
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 Trip amp data sheet
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Signal
Isolator |
A field programmable
unit providing 3-port isolation. These units may be used as signal repeaters or
converters and can convert a wide range of signals: current to current, current
to voltage, voltage to voltage, voltage to current. Standard features include
field programmable input and output ranges covering all common process signals |
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COM-3B |
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Isolator data sheet |
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 Isolator user guide
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Loop Isolator
(loop
powered) |
This unit is a
4-20mA signal repeater which offers isolation between input and output. Being
loop powered, no auxiliary power supply is required. The voltage drop across
the input terminals is only two volts more than across the output terminals. |
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140-3 |
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Loop isolator data sheet |
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Status Telecom Transmitter
/ Receiver |
Two units forming a
transmitter / receiver pair for signalling a switched state over transmission
lines.
The Tone Transmitter accepts either open-collector, volt-free
contact or voltage change type inputs and converts off/on states into
400Hz/2000Hz tones for transmission. A dual colour LED provides power-on
(green) and input pulse active (red).
The Tone Receiver converts the
transmitted tones into a relay output (SPCO). A 'loss of signal' warning output
(open collector) is provided. Dual colour LED provides indication of two
operating states 1 - green: power-on/receiving 400Hz and 2 - red: power
on/receiving 2000Hz signals. |
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Transmitter |
COM-60 |
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Receiver |
COM-61 |
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Status transmitter / receiver data sheet |
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Analogue Telecom Transmitter
/ Receiver |
Two units forming a
transmitter / receiver pair for transmitting an analogue signal where a copper
wire connection is not available. As these units do not rely on the passage of
DC current or voltage signals, they enable a 4-20mA or 1-5V signal to be
transmitted over telecom circuits including optical fibres and multplexed
circuits
The COM-70 converts an analogue signal into a frequency in the
range 400-2000Hz. This sine-wave signal is isolated by a transformer with
impedance matched to suit a 600 ohm telecom line. The COM-71 has a transformer
matched to suit 600 ohm transmission lines. It accepts a signal in the range
400-2000Hz and converts this into a 4-20mA signal. Loss of received tone causes
the indicator LED to show red. A normal state is indicated by this LED showing
green. |
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Transmitter |
COM-70 |
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Receiver |
COM-71 |
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Analogue transmitter / receiver data sheet |
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