GE Mark VIeS - RTD Inputs; RTD Wiring; RTD Types and Temperature Ranges

7.8 RTD Inputs
The YUAA has an RTD input performance equivalent to the existing SRTD for RSS accuracy covering 100 to 200 ohm
sensors, with slow speed only (no fast mode). Analog channels support RTD inputs covering resistance spans matching
Nickel and Platinum sensors, as compared to the existing SRTD. Resistance input from RTD sensors can be from 60 to 450
ohms, using 3–wire connections, with or without a shared return line.
RTD (3–wire) processing uses a single channel, with the channel alternating between voltage and current measurements to
derive the sensed resistance. The currents are provided by the dual current sources, while the DAC terminal on the SUAA is
an active ground to return the current. The YUAA does not support Fast mode. A single Slow mode of operation is used, with
an acquisition time of 500 milliseconds or faster for 16 channels.
RTD
Sensor
( 3 wire )
I / O+
I /O-
RTN
RTD
Sensor
( 3 wire)
I / O+
I /O-
RTN
RTD
Sensor
( 3 wire )
I /O+
I/ O-
RTN
RTD
Sensor
( 3 wire )
I/ O+
I/ O-
Shared Return
to one channel
Individual Returns
to each channel
RTD Wiring
The I/O pack configuration and the final ohms value is used to lookup a temperature value based on the type of RTD selected.
This final value is returned in signal space as either ohms or a temperature in degrees (Celsius or Fahrenheit set by parameter
TempUnits). The available RTD types are displayed in the following table, using a current source of up to 1 mA with a
compliance voltage range of up to 5 V.
RTD Types and Temperature Ranges
Value
RTD Type Compatible Device Types Min Temp (ºF) Max Temp (ºF)
1 Minco PD PT100 DIN -325.893 1566.553
2 Minco PA PT100 PURE -323.885 1167.418
3 Minco PB
PT100 USIND
-329.068 1166.875
Rosemount 104
4 Minco NA N 120 -113.662 499.599
5 Minco PIA None -413.319 1765.473
6 Minco SAMA SAMA 100 -322.438 1112.704
7 Minco PK PT 200 -101.918 511.573
8 Minco PN None -101.918 511.573
10 Minco CA CU10 -153.768 531.560
9 Ohms
Not Applicable
< 10 ohms 625 ohms
YUAA Universal I/O Modules GEH-6855_Vol_II System Guide 191
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