D2275-02-02 SEM315 CN4978 WEB User guide
Notes
1
Any span may be selected but full accuracy is only guaranteed for spans greater than the
minimum recommended.
2
Includes the effect of calibration, linearisation and repeatability.
3
Custom characterisation is available pre-programmed at the factory. Contact your nearest
Sales office.
4
Consult Thermocouple reference tables for practical temperature ranges.
5
For supply voltages over 30V, a minimum loop load of 500
Ω
is necessary.
2.6 GENERAL
Input/Output Isolation
500 VAC
Time Constant (Filter Off)
0.5 secs (to 90 % of final value)
Filter Factor Programmable
Off / selectable between 1 and 32 seconds / or Adaptive
Warm-up Time
120 seconds to full accuracy
ENVIRONMENTAL
Ambient Operating Range
(-40 to 85) °C
Ambient Storage Temperature
(-50 to 90) °C
Ambient Humidity Range
(10 to 95) % RH non condensing
EMC
BS EN 61326
MECHANICAL
Enclosure
DIN Rail mounted to fit DIN EN 50022-35
Material
ABS
Weight
70 g
Dimensions
(90 x 99 x 18.5) mm
Flammability
UL94-V0
Connections
Tension clamp two terminals and 3.5 jack for comms.
Page 3
3.0 INSTALLATION
3.1 MECHANICAL
The transmitter is designed to mount onto a standard Din Rail. The transmitter should be installed
with adequate protection from moisture and corrosive atmospheres. The transmitter may be mounted
in any orientation.
Care must be taken when locating the transmitter to ensure the ambient temperature remains within
the specified operating range. Figure 1 shows the mechanical layout of the transmitter
Fig 1
(All Dimensions in mm)
3.2 ELECTRICAL
Connections to the transmitter are made to the tension clamp terminals provided on the front face.
Output signal wiring should use screened twisted pair. It is recommended that screened cable is used
for the input signal wires for cable runs greater than one metre. For Pt100 inputs all input wires must
have the same core diameter to maintain equal resistance in each wire.
Figure 2 shows the method of connection to provide a (4 to 20) mA current loop output. The output
loop has a voltage power supply used to provide loop excitation. The load symbol represents other
equipment in the loop, normally indicators, controllers or loggers. Care must be taken when designing
the (4 to 20) mA circuit to ensure that the total voltage requirements of all the equipment in the loop
added together, does not exceed the power supply voltage. If a number of instruments are connected
in the loop, ensure that only one instrument is tied to ground. Grounding the loop at two points will
cause a short circuit of part of the loop leading to measurement errors. To maintain CE compliance
the transmitter should be mounted in an enclosure to prevent access to the transmitter during normal
operation.
Page 4
18.25
99.5
90.0
6
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8
9
10
5
4
3
2
1
