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6 Electrical Installation
CAUTION
Remove power from the Searchzone Sonik before performing any electrical installation or
maintenance.
6.1 Power Supply Requirements
The Searchzone Sonik detector requires a voltage supply of 18 - 32 Vdc (nominal 24 Vdc). Power consumption is 4 W maximum when
the internal heater is not active, i.e. for ambient temperatures above -30°C. At lower ambient temperature the internal heater is active
and power consumption may reach up to 15 W.
Ensure that the minimum required supply voltage 18 VDC is present at the detector, taking into account the voltage drop due to cable
resistance.
Note
Make allowance for the insertion loss resistance.
The maximum loop resistance in the field cable is calculated as follows:
As an example, V
detector min
the connected power supply or control system. Consult the manual of that equipment for this information.
CAUTION
The detector 24 V power supply and 4-20 mA current loop power supply must be of an isolating type
(galvanic isolation from mains, providing basic insulation) but does not need to be a Class II (SELV)
power supply.
CAUTION
If mains voltage is connected to more than one relay, all relays must be connected to the same phase
of the mains network. Using different phases is not allowed.
6.1.1 Internal Battery Cell
A primary cell featuring an expected operating life of 10 years is fitted internally. This is not accessible and replacement must only be
conducted by an authorized service centre.
6.2 4-20 mA Current Loop
The Detector provides a 4-20 mA current loop with HART Communication which can be user configured as a Sink, Source (3-Wire) or
Isolated (4-Wire) electrical interface, based on installation requirements.
Depending on configuration, the 4-20 mA current loop output can provide:
• discrete indication of operating modes (Normal operation, Pre-alarm, Alarm) and special states (Fault, Warning, Inhibit, Over-range)
• proportional output to ultrasound pressure level (dB SPL) and a discrete indication of special states (Fault, Warning, Inhibit, Over-
range).
PN 2331M1220 Issue 1
= 18 V; P
= 4 W or 15 W (dependent on environmental conditions) V
max
Searchzone Sonik − Technical Manual
6 Electrical Installation
will depend upon
controller
11/2018
31
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