Watlow CAS200 - Manual (Page 110)

Chapter 7: Specifications CAS200 User’s Guide
98 Watlow Anafaze
Inputs
The scanner accepts analog sensor inputs which are
measured and may be used as feedback for control loops. It
also accepts digital (TTL) inputs which may be used to
trigger certain firmware features.
Table 7.11 Analog Inputs
Parameter Description
Number of Channels 17
Number of Analog Inputs 16 with full range of input types, plus one pulse
Input Switching Single-ended, solid state multiplexer
Input Sampling Rate 1.5Hz (667ms) at 60Hz; 1.25Hz (800ms) at 50Hz
Analog Over Voltage
Protection
±20V referenced to digital ground.
Common Mode
Rejection (CMR) For inputs that do not exceed ±5V, >60dB dc to 1kHz,
and 120dB at selected line frequency.
A/D Converter Integrates voltage to frequency
Input Range
-10 to +60mV, or 0 to 25V with
scaling resistors
Resolution 0.006%, greater than 14 bits (internal)
Accuracy
0.03% of full scale (60mV) at 25°C
0.08% of full scale (60mV) at 0-50°C
Calibration Automatic zero and full scale
Analog Ground to Frame Ground
Maximum
40V
DC Common to Frame Ground
Maximum Potential
40V
Thermocouple Break Detection Pulse type for upscale break detection
Milliampere Inputs
0-20mA (3 Ω resistance) or 0-10mA (6Ω resistance),
with
scaling resistors
Linear Voltage Input Ranges
Available 0-12V, 0-10V, 0-5V, 0-1V, 0-500mV, 0-100mV with
scaling resistors.
Source Impedance
For 60mV thermocouple, measurements are within
specification with up to 500
Ω source resistance
For other types of analog signals, the maximum source
impedance is 5000
Ω