Aplisens APR-2000ALW User Manual

E6 40 DTR.APC.APR.ALW.03(ENG)
Transmitters with flange diaphragm seals are to be installed on the corresponding counter flanges on
the facility.
It is recommended that the user matches the screw joints material to the pressure, temperature, flange
material and seal to ensure tightness of the flange joint in the expected operating conditions.
Screws complying with ISO 261 are to be used for flanges used in the APC..., APR... transmitters.
Additional data concerning the diaphragm seals are specified in the “DIAPHRAGM SEALS” catalogue cards.
9. ELECTRICAL CONNECTION
9.1. General recommendations
9.1.1. It is recommended that twisted pair cabling be used for the signal lines. If the transmitter and signal line
are subject to a large amount of electromagnetic interference, then shield pair cable should be used. The signal
wires should not run alongside network power supply cables or near to large electrically-powered devices.
The devices used together with the transmitters should be resistant to electromagnetic interference from the
transmission line in accordance with compatibility requirements. It is also beneficial to use anti-interference
filters on the primary side of the transformers, the power supplies used for the transmitters and apparatus used
in conjunction with them.
9.1.2. Wet or rising damp inside transmitter can cause its damage.
When the isolation of the wires in the cable gland is ineffective (for example, when single wires
are used) the opening of the gland should be carefully sealed with an elastic sealing compound
to obtain IP66 protection. It is useful to form the segment of the signal wire leading to the cable
gland into a protective loop to prevent condensation from running down in the direction of
the gland.
9.2. Electrical connections for APC..., APR...
The APC..., APR... transmitters are to be connected as shown in Fig. 2a – 2d.
In APC..., APR... transmitters, a 240Ω resistor is permanently fitted in series in the transmitter’s current
circuit and blocked up with jumper between <SIGNAL –> and <TEST –> as shown in Fig.2a and 2b.
When the resistance in the current loop is lower than 240Ω it is necessary to jumper disassemble to
HART communication.
9.3. Protection from excess voltage
9.3.1. The transmitters may be in danger from excess voltage caused by connection faults or atmospheric
electrical discharge.
Protection from excess voltage between the wires of the transmission line is provided by TVS diodes installed in
all types of transmitter (see the table, column 2).
9.3.2. In order to protect against excess voltage between the transmission line and the casing or earth
(not prevented by the diodes connected between the transmission wires), additional protection is provided in
the form of plasma surge arresters (see the table, column 3).
Also external protective devices may be used, e.g. the UZ-2 Aplisens system, or others. When the transmission
lines are long, it is advantageous to use one protective device near the transmitter (or inside it), and another near
entry points to other devices used in conjunction with it.
Internal protection of transmitters:
1
2
3
Type of
transmitter
Protection between wires (TVS
diodes) – nominal voltage
Protection between wires and earth and/or casing –
type of protection, nominal voltage
APC..., APR...
68V DC (for normal and Exd version
39V DC (for Exi version)
Plasma surge arresters - 230V DC
(for normal, Exd, SA version).
9.3.3. The voltage in the protective elements must not exceed the maximum permitted values given in columns
2 and 3 of the table.
The insulation test voltages 500V AC or 750V DC and 75V AC or 110V DC for transmitters with
plasma surge arresters.
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Aplisens APR-2000ALW Specifications

General

Brand	Aplisens
Model	APR-2000ALW
Category	Transmitter
Language	English