Aplisens APM-2 Manual do dispositivo - Página 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.

Figure 6. Connecting Exd transmitter.

Maximum supply voltage

36V DC

). The transmitter

Figure 6

= 240 Ω, which is short-

resistor is used when

Revision 01.A.001/2022.09