Optional Facilities; Analogue Outputs (Option); Alarm Trip (Option) - Systech Instruments EC900 series Operator's Instruction Manual

EC900 Series Operation Manual
V4.7

15.0 OPTIONAL FACILITIES

Series EC910 & EC930 Connections
See Drawings B 900 150A
B 900 162A.
Series EC920 Connections
See Drawing B 920 037 A

15.1 Analogue Outputs (Option)

The analogue output option provides three outputs, each configurable for 0-10V, 4-20mA or 0-20mA
(isolated) for connection to a chart recorder, computer or other device for tracking the response of the
analyzer. These signals are available at the connector on the rear panel, as labelled.
The current output (4-20mA) can drive a load of up to 500 Ohms. The voltage and current outputs
may also be used simultaneously so that more than one device may be driven by the analyzer.
The user may set the analogue output high and low values according to their needs by modifying
OPH (output high) and OPL (output low).
For example:
By setting OPH to 2.5% and OPL to 1%, the 10V signal is assigned to 2.5% oxygen and 0V to 1%
oxygen. Likewise, the 20mA signal indicates 2.5% and 4mA is 1%. As the oxygen varies between 1
and 2.5%, the voltage and current signals will also vary. If connected to a computer then these
signals can be used to trigger an alarm message based on the voltage or current level (which
corresponds directly to the oxygen level).
NOTE Analogue outputs are an option which must be ordered at the time of initial purchase. If they
need to be retrofitted to an existing MK3 900 series instrument it must be returned to Systech / Illinois
for processing.

15.2 Alarm Trip (Option)

There are two volt free alarm contacts, rated 5A/240V. Both have normally open and normally closed
contacts and reference should be made to the connection diagram at the rear of this manual. The
contacts are designated normally open and normally closed under normal alarm free operation,
power on.
Please note that should a latched alarm position be set the relay will not change back until it is
unlatched, assuming the measured value has reverted back to a non alarm value.
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