Technical Data; Input; Resistance; Thermocouples/Voltages - ABB TTF350 Operating Instructions Manual

Technical data

14 Technical data
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14.1 Input

14.1.1 Resistance

RTD resistance thermometer
Pt100 in acc. with DIN IEC 60751, JIS, MIL, Ni in acc. with DIN 43760, Cu
Resistance measurement
0 ... 500 Ω
0 ... 5000 Ω
Sensor connections
2-, 3-, 4-wire circuit
Connecting cables
2-, 3-, 4-wire max. sensor line resistance (R
in acc. with NE 89 (March 2003);
(3-wire balanced, 2-wire circuit compensation up to 100 Ω sensor
total line resistance)
Measurement current
< 300 µA
Sensor short-circuit
< 5 Ω (for RTD)
Sensor wire break (temperature resistance measurement 2-, 3-,
4-wire)
Measuring range 0 ... 500 Ω
Measuring range 0 ... 5 kΩ
Corrosion detection in accordance with NAMUR NE 89
3-wire resistance reading > 50 Ω
4-wire resistance reading > 50 Ω

14.1.2 Thermocouples/Voltages

Types
B, E, J, K, L, N, R, S, T, U, C, D
Voltages
-125 mV ... 125 mV
-125 mV ... 1100 mV
Connecting cables
Max. sensor line resistance (R
Sensor wire break monitoring in accordance with Namur NE 89
pulsed with 1 µA outside the measurement interval
Thermoelement measurement
Voltage measurement
Input resistance
> 10 MΩ
Internal reference junction
Pt100, DIN IEC 60751 Cl. B
(no jumpers necessary)
Customer specific curve, 32-tie points
Resistance measurement up to max. 5 kΩ
Voltages up to max. 1.1 V
Sensor matching
via Callendar van Dusen coefficients
via table of 32 sampling points
via single point (offset adjustment)
via two point adjustment
Input functionality
1 Sensor
2 Sensors:
mean measurement
Differential measurement: Zero point where Ia = 4 mA
Differential measurement: Zero point where Ia = 12 mA
Sensor redundancy
66
) for each wire 50 Ω
W
> 0.6 ... 10 kΩ
> 5.3 ... 10 kΩ
) for each line 1.5 kΩ, total 3 kΩ
W
5.3 ... 10 kΩ
5.3 ... 10 kΩ
Sensor fault signaling
RTD sensor:
Linear resistance measurement:
Thermocouple:
Linear voltage measurement:

14.2 Output

Transmission characteristics
temperature linear
resistance linear
voltage linear
Output signal
Configurable 4 ... 20 mA (standard)
Configurable 20 ... 4 mA
(NE43 dynamic range: 3,8 ... 20.5 mA)
Simulation mode
3,5 ... 23,6 mA
Induced current consumption
< 3,5 mA
Maximum output current
23,6 mA
Configurable error current signal
override 22 mA (20.0 ... 23.6 mA)
underdrive 3.6 mA (3.5 ... 4.0 mA)
Configurable analog alarm pulse if
maintenance required.
In redundancy mode when a sensor fails and/or in
drift mode if the maximum sensor drift value will exceeded.
(For details, refer to OI TTF350.)
Two configurable warning limits
HART-Signal/diagnostic bit information
Two configurable alarm limits
HART-Signal/diagnostic bit information
TTF350
Short circuit and wire break
Wire break
Wire break
Wire break
OI/TTF350-EN