7.2
EN61326+A1
Electrical equipment for measurement, control and laboratory use - EMC
requirements.
7.2.4 Analogue outputs
Two isolated 0-20mA/4-20mA output with full zero and span adjustment as standard.
The user may define a second range by means of an external contact closure.
A maximum total of eight, two range outputs are available by selecting option cards.
Maximum impedance for each output is 1K
.
Maximum output current for each output is 20.5mA.
Maximum output voltage for each output is 27V.
7.2.5 Alarms
Three "volt free" single pole relay contacts rated at 264Vac/30Vdc @ 1.0Amp as standard.
Nine further general purpose relays are available by selecting option cards, however only
four concentration alarms may be assigned to one transducer.
(Two similar relays are available as part of the 'external autocalibration' option. These contacts
are used exclusively to control solenoid valves).
7.2.6 Serial data/Modbus connection
Single RS232/RS485 serial port, user configurable from 2400 to 19200 baud. This may be used
as an ASCII data logging output or for communication using the Modbus protocol.
7.2.7 Analogue inputs
Two 'floating' (maximum common mode voltage 13V) 4-20mA/0-20mA linear inputs.
Associated digital input per channel to indicate data validity.
Intrinsic Error <0.02mA.
7.2.8 Digital inputs
Analogue input 1 valid.
Analogue input 2 valid.
Analogue outputs range change (contact closure).
Auto calibration initiate (contact closure).
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