Rtd Inputs; Rtd Wiring; Rtd Types And Temperature Ranges - GE Mark VIeS System Manual

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.
Individual Returns
Sensor
( 3 wire )
Sensor
( 3 wire )
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 Type
Value
1 Minco PD
2 Minco PA
3 Minco PB
4 Minco NA
5 Minco PIA
6 Minco SAMA
7 Minco PK
8 Minco PN
10 Minco CA
9 Ohms
YUAA Universal I/O Modules
to each channel
RTN
RTD
I / O+
I / O-
RTN
RTD
I / O+
I / O-

RTD Types and Temperature Ranges

Compatible Device Types
PT100 DIN
PT100 PURE
PT100 USIND
Rosemount 104
N 120
SAMA 100
PT 200
Not Applicable
Public Information
Shared Return
to one channel
RTD
Sensor
( 3 wire )
RTD
Sensor
( 3 wire )

RTD Wiring

Min Temp (ºF)
-325.893
-323.885
-329.068
-113.662
None -413.319
-322.438
-101.918
None -101.918
CU10 -153.768
< 10 ohms
RTN
I / O+
I / O-
I / O+
I / O-
Max Temp (ºF)
1566.553
1167.418
1166.875
499.599
1765.473
1112.704
511.573
511.573
531.560
625 ohms
GEH-6855_Vol_II System Guide 191