D2272-02-05 CN5219 SEM310 WEB User Guide
Allowable Temperature classification / ambient temperature:-
Intrinsic safety (Type ia)
Class
Ambient Temperature
Range
T1
450 °C
(-40 to 85) °C
T2
300 °C
(-40 to 85) °C
T3
200 °C
(-40 to 85) °C
T4
135 °C
(-40 to 85) °C
T5
100 °C
(-40 to 50) °C
T6
85 °C
(-40 to 40) °C
ENVIRONMENTAL PROTECTION
This equipment must be housed in an enclosure which provides a degree of protection of at least
IP54. The enclosure must be suitable for the atmosphere and environment in which it is installed. (eg
If of a plastic material, must be resistant to chemical corrosion, UV light, temperature, Humidity, etc).
MAINTENANCE
This intrinsically safe equipment contains no user serviceable, adjustable or replaceable parts. No
attempt should be made to repair a faulty SEM310X transmitter, all units must be returned to the
manufacture for repair or replacement. Attempting service or replacement of parts may invalidate the
explosive protection features of the equipment.
CONNECTION DIAGRAM
They equipment must be electrically connected as shown below:-
Fig 2
SEM310X Working Parameters
Ui
30 V
I i
100 mA
Pi
750 mW
Ci
10 nF
Li
0 H
Page 5
3.0 INSTALLATION
3.1 MECHANICAL
The transmitter is mounted on standard 33 mm fixing centres and will fit a DIN standard termination
head. The transmitter should be installed with adequate protection from moisture and corrosive
atmospheres. (Refer to section 2.7.3 Environmental Protection for SEM310X)
A Ø6.3 mm hole is provided through the centre of the transmitter to allow sensor wires to be threaded
through the transmitter body direct to the input screw terminals. The screw terminals have been
designed to allow all connection wires to enter from an inner or an outer direction.
Care must be taken when locating the transmitter to ensure the ambient temperature remains within
the specified operating range.
Fig 3
(All Dimensions in mm)
3.2 ELECTRICAL
Connections to the transmitter are made to the screw terminals provided on the top face. No special
wires are required for the output connections, but screened twisted pair cable is the most suitable for
long runs. It is recommended that screened cable is used for the sensor connection wires for cable
runs greater than one metre. All input wires must have the same core diameter to maintain equal lead
resistance in each wire.
Figure 4 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 guarantee CE compliance, sensor leads must be less than 3 metres long and the transmitter
housing should prevent access to the transmitter during normal operation.
Page 6
HAZARDOUS AREA
SAFE AREA
SENSOR
3
4
5
6
2
1
SEM310X
BARRIER
Vo 30 V
Io 100 mA
Po 750 mW
DC
SUPPLY
+
_
EARTH
24.00
Ø44.00
Ø33.00 Centres
Centre hole Ø6.3
