Aplisens APM-2 Руководство по эксплуатации устройства - Страница 14
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EN.IX.APM.2
11.2. Power supply, connection and operation of Exd transmitters
Connect the transmitter according to the wiring diagram (
electrical connections in potentially explosive zones should be made by personnel
having necessary knowledge and experience in this respect. The transmitter should
be properly grounded by means of a grounding terminal.
Transmitter and equipment in the transmitter measurement loop must be connected
in compliance with explosion proofing standards and conditions for application in
explosion risk zones. If these rules are not followed, explosion can occur and people
can be exposed to danger.
The transmitter should be supplied with maximum voltage specified in the table
below (24 VDC rating) from transformer power supplies or other devices providing at
least enhanced isolation between primary and secondary winding in which voltages
not larger than 250 VAC occur. It is responsibility of the user to provide power supply
compliant with the requirements above.
Table 4. Maximum supply voltage for Exd and Ext transmitters
In an explosion risk zone, do not remove the cover of supplied transmitter and do not
connect to the terminals, and do not change the position of local indicator (display).
For transmitter calibration or check outside a risk zone, a communicating device can
be connected to <SIGNAL +> and <TEST +> terminals.
The transmitter is equipped with a communication resistor R
circuited at <SIGNAL -> and <TEST -> terminals in factory. R
the transmitter need to be communicated with locally (from its terminals) and a Ro <
240 Ω. <SIGNAL -> and <TEST -> terminals must be open-circuited then.
In order to secure the side covers against loosening, unscrew the hex socket screws
pressing the screw heads against the edges of the covers. The method of locking the
covers against unscrewing and the possible method of sealing the transmitter are
presented in the EN.IO.APM.2 user manual.
14
Figure 6. Connecting Exd transmitter.
Maximum supply voltage
36V DC
). The transmitter
Figure 6
= 240 Ω, which is short-
D
resistor is used when
D
Revision 01.A.001/2022.09