
EN.IO.APC.APR.ALW
Revision 02.A.005/2020.06
19
7.2. Transmitter power supply
7.2.1. Transmitter supply voltage
Power cables may be live.
There is a risk of electric shock and/or explosion.
Installation of the transmitter in explosion-risk atmospheres must comply with national
standards and regulations.
All explosion protection data is given in manual EN.IX.APC.APR.ALW.
Table 2.
Permissible transmitter supply voltages.
Version
Minimum supply voltage
Maximum supply voltage
Exi i Exd*
11,5 V DC**
30 V DC (Exi)
55 V DC (Exd)
Exd*
13,5 V DC***
55 V DC
Standard
10,0 V DC
55 V DC
Exi*
10,5 V DC
30 V DC
* For details on intrinsically safe and flameproof version see manual EN.IX.APC.APR.ALW.
** Minimum supply voltage with backlight off. Possibility of turning on the backlight only by manufacturer at
the transmitter production stage (then U
min
=14,5 V DC).
*** Minimum supply voltage with backlight on. Possibility of turning off the backlight only by manufacturer at
the transmitter production stage (then U
min
=10,5 V DC).
7.2.2. Uninterruptible current measurement in 4
…20 mA current loop
The transmitter is capable of continuous current measurement in the current loop using an ammeter.
In order to maintain the current measurement error below 0,05%, the internal resistance of the amme-
ter shall be less than 10 Ω.
Ammeter connection diagram
– see: (
➔
. Electrical connection to transmitter
).
7.2.3. Specifications of electrical switching terminals
Internal electrical switching terminals are suitable for conductors with the cross-section from
0,5 to 2,5 mm
2
. The internal and external electrical ground terminal of the body is suitable for conduc-
tors with cross-section from od 0,5 to 5 mm
2
.
7.2.4. Cabling specification
Aplisens S.A. recommends using two-wire screened twisted pair cable. The outer diameter of the ca-
ble shell from 5 to 9 mm is recommended.
7.2.5. Resistance load in power supply line
The power line resistance, power source resistance and other additional serial resistances increase
the voltage drops between the power source and the transmitter terminals. The maximum current of
Exd or Exi/Exd transmitters under normal operation conditions is defined as I_max = 20,500 mA + E,
where E is the acceptable safety error, which is
± 0,160 mA. The maximum current of standard or Exi
transmitters under normal operation conditions is 20,500 mA, but during high alarm the value of cur-
rent I_max is 22,000 mA.
Summary of Contents for 0005 0004 0006 0000 0000 0002 0001 72
Page 35: ......