Siemens SITRANS T4200, Руководство по эксплуатации, Страница: 73 / 100

Technical data
11.1 Technical data
SITRANS TH200/TH300
72
Operating Instructions, 06/2010, A5E00393069-03
Resistance-type transmitter input point
Measured variable Ohmic resistance
Sensor type Resistance, potentiometer
Units of measurement Ω
Interface

Standard connection
1 resistance-type transmitter (R) in two-wire, three-wire or
four-wire input

Averaging
2 resistance-type transmitters in two-wire input for
averaging

Differentiation
2 resistance-type transmitters in two-wire input
(R1 - R2 or R2 - R1)
Connection
 Two-wire input Line resistance can be assigned in the parameters
≤100 Ω (loop resistance)
 Three-wire input No trim necessary
1)

Four-wire input
No trim necessary
Sensor current ≤ 0.45 mA
Measuring cycle ≤ 250 ms for 1 sensor with break monitoring
Break monitoring Always active (cannot be switched off)
Short circuit monitoring Can be switched on/off (default value = OFF)
Measuring range Setting range max. 0 ... 2200 Ω (see table in chapter
Digital measuring error (Page 78))
Min. measuring span 5 ... 25 Ω (see table in chapter Digital measuring error
(Page 78))
Characteristic curve Linear to resistance or special characteristic curve
1)
Prerequisites: same resistance for all three lines.