S+S Regeltechnik Thermasgard RTM Operating Instructions, Mounting & Installation page 7

G
Measuring transducers, calibrateable, with active output
Output: ............................................. 4...20 mA
Connection: ..................................... 2-wire connection
Auxiliary energy: ............................ 15 ... 36 V DC ± 10 %,
Working resistance: ...................... Ra (Ohm) = (Ub-14 V) ⁄ 0.02 A
Output: ............................................. 0 - 10 V
Connection: ..................................... 3-wire connection
Auxiliary energy: ............................ 24 V AC ⁄ DC ± 20 %
Working resistance: ...................... minimum load resistance 5 kOhm
Accuracy: ......................................... ± 0,8 K
Measuring element: ....................... see table
Operating temperature: ............... transmitter - 30...+ 70 °C
Linearisation: .................................. temperature linear
Linearity error: ............................... ± 0.3 % of measuring range
Standards: ....................................... CE conformity,
TEMPERATURE RANGES:
When selecting measuring transducer ranges,
it is necessary to ensure that the maximum temperatures
permissible for sensor ⁄ enclosure are not exceeded !
Ambient temperature for measuring transducers:
- 30 ...+ 70 °C
Apparent ohmic resistance =
Voltage supply – internal current consumption (7.5 V)
20 mA
SUPPLY VOLTAGE:
For operating voltage reverse polarity protection, a one-way rectifier
or reverse polarity protection diode is integrated in this device variant.
This internal one-way rectifier also allows operating 0 - 10 V devices
on AC supply voltage.
The output signal is to be tapped by a measuring instrument. Output
voltage is measured here against zero potential (0 V) of the input voltage!
When this device is operated on DC supply voltage, the operating volt-
age input UB+ is to be used for 15...36 V DC supply and UB– or GND for
ground wire!
When several devices are supplied by one 24 V AC voltage supply, it is to
be ensured that all "positive" operating voltage input terminals (+) of the
field devices are connected with each other and all "negative" operating
voltage input terminals (–) = reference potential are connected together
(in-phase connection of field devices). All outputs of field devices must be
referenced to the same potential !
In case of reversed polarity at one field device, a supply voltage short-
circuit would be caused by that device. The consequential short-circuit
current flowing through this field device may cause damage to it.
Therefore ensure correct wiring !
supplied from 4...20 mA loop,
residual ripple, stabilised ± 0.3 V
according to DIN IEC 751
electromagnetic compatibility
according to EN 61326: 2006,
according to EMC directive
2004 ⁄ 108 ⁄ EC
Load resistance diagram
800
700
600
500
400
300
250
200
50
10 15 20
Operating voltage (V DC)
Dependency of output voltage on output current
12
Ua (V)
10
8
6
4
2
0
0 0.5 1.0 1.5
Connecting scheme
Power supply
AC 24V~ 0V
DC 15-36V = GND
Connecting scheme
Power supply
AC 24V~ 0V
DC 15-36V = GND
Load resistance diagram
4 ... 20 mA
Admissible
range
25 30 35 36 40
Ia (mA)
2.0 2.5 3.0 3.5 4.0 4.5
Individual operation
Circuitry
V
Parallel operation
Circuitry Circuitry