Hardware Installation
SCX 920 Installation Guide 7
Input Circuit Specifications
Caution
Andover Controls inputs are designed to be used with two-wire devices
and do not provide sufficient power to operate sensors or transducers
requiring an external power supply.
The following specifications apply to SCX 920 inputs:
• Voltage Range—0 to 10.000 V
• Resolution—0.0025 V
• Accuracy—+/–0.005 V
• Maximum Pulse Frequency—5 Hz at a duty cycle of 50% and a
minimum pulse width of 100 ms
• Input Impedance—30.1 KΩ referenced to 10.000 V
or 10 MΩ referenced to ground with the input reference resistor
switch set to OUT
• Filtering—Corner Frequency at 16 Hz –20 db/decade
• Over-Voltage Protection—120 VAC RMS or 120 VDC indefinitely
on any single channel; +/–1500 V transient for 50 µs on all channels
• Calibration—Permanent (factory)
Special Factors for Thermistors
To keep thermistor errors minimal, lay out your site so you can limit the
length of wire runs to the maximum for the gauge wire you select.
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