Analog A I/O Port - Optional - Thermo Scientific NESLAB EX Series Installation, Operation And Maintanance Manual

Analog Port - Optional
(Digital Plus Only)
A I/O Analog Port
The 15-pin female receptacle located on the rear of the controller is used for
optional analog interface.
The analog signal is setup using the unit's Computer Setup Loop. With the
bath on, press and hold the Computer button for five seconds. The controller
will display SErL. If needed, press the arrow buttons to toggle between 232,
485, and A In. With A In displayed, press the Computer button again until
StorE is displayed, press YES. Use the Computer button to enable/disable the
analog signal. The button will flash when A in is enabled.
Contact Ratings, Pins 1, 2, and 3
Maximum Voltage = 30 V AC/DC
Maximum Current = 1 Amps @ 30 V
Minimum permissible load 10uA, 10mVDC
Pin # Function
1 Status relay NO. Status relay pins 1 and 3 close on start up, and open
on stop and all errors.
2 Status relay NC. Status relay pins 2 and 3 open on start up, and close
on stop and all errors.
3 Status relay common
4-5 Not used
6 Analog Ground. The analog ground is physically separated from the
power ground throughout the unit. To prevent offsets that result from
ground currents, the analog and power grounds are only connected at
the unit's power supply. Analog ground should only be used as a
reference pin.
7 Temp out. The fluid temperature, as measured by the enabled sensor,
can be read at this pin. The temperature scale is 10mV/°C, referenced
to analog ground, pin 6 (example: +150mV = +15.0°C).
8 Not used
9 Digital output ground, reference for pin 14. Digital output ground should
only be used as a reference pin.
10-13 Not used
14 Digital output +5VDC at 15mA max. 70mA max inrush current. This
power supply energizes on start up and de-energizes on stop and all
errors.
15 Setpoint in. The temperature setpoint can be controlled by applying a
known voltage to this pin. The temperature scale is 10mV/°C, refer-
enced to analog ground, pin 6 (example: +230mV = +23.0°C).
The analog output requires calibration, see page 38.
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