Campbell Scientific CR9000X Measurement and Control System - Manual (Page 45)

Overview
CR9055(E) 50-Volt Analog Input Module
9055 50V ANALOG INPUT
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DIF
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MADE IN USA
FIGURE OV1-10. CR9055
The only difference between a CR9055 and a CR9055E is that the CR9055E is
an "Easy Connect" module type, and includes a CR9055EC (See Figure OV1-
6). The CR9055E typically remains in the CR9000(X) chassis while each
CR9055EC remains connected to the sensors. This allows one CR9000(X)
system to be moved from location to location and be quickly connected to the
sensors on-site.
The CR9055(E) 50-Volt Analog Input Module has 14 differential or 28 single-
ended inputs for measuring voltages up to
±50 V. Resolution on the most
sensitive range is 16 μV. The CR9055 has an operational input voltage limit
range of ±50 V.
Full Scale Maximum
Range Resolution Throughput
± 50.0 V 1580 uV 50 KHz
± 10.0 V 320 uV 50 KHz
± 2.0 V 63 uV 25 KHz
± 0.5 V 16 uV 25 KHz
All inputs on the CR9050(E) and CR9051E modules are multiplexed through
the single 16 bit A/D on the CR9041 A/D module. The maximum aggregate
throughput for all channels on all modules is 100,000 samples per second. The
higher range codes are simply accomplished through the use of a voltage
divider network.
CR9055(E) SUPPORTED MEASUREMENT INSTRUCTIONS:
VoltDiff Differential Voltage
VoltSe Single-Ended Voltage
TCDiff Differential Thermocouple
TCSE Single Ended Thermocouple
Normally thermocouple measurements would be made on the CR9050 Analog
Input Module (
±5 Volt) because of its greater resolution, however they can be
made with the CR9055(E) using the 0.5 V range if the ±50 V operational
voltage range is necessary and a CR9058E Isolation module is not available.
The 16
μV resolution corresponds to about 0.41 degrees C resolution for the
measurement.
As the CR9055(E) does not have a PRT for measuring the
reference temperature for the thermocouple measurement, either
an adjacent CR9050 or CR9051E module's reference
temperature can be used. If there are temperature gradients in
the chassis, this will lead to additional measurement errors. NOTE
OV-13