4B Digimatic DML4W, Operation Manual

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PAGE 8
INSTALLATION
A thread locking compound is already applied to the probe fixing stud of the Digimatic. This will prevent the
probe rod from vibrating loose. Once fitted, the compound is fully hardened after 20 minutes.
IMPORTANT: If the probe rod is removed from the unit for any reason, a thread locking compound must
be applied before the rod is refitted.
When mounting all versions of the Digimatic, care must be taken to ensure that the power shield is properly
installed.
DIGIMATIC will operate on 110V/230V ac 50/60Hz or 24V dc supplies. The unit may be wired in ordinary
un-screened cable of any length and need not be separated from other cables.
A SUPPLY EARTH IS ESSENTIAL!
When mounting the DIGIMATIC, care must be taken to ensure that the exposed end of the power shield
protrudes into the container.
Mount unit securely to minimise vibration. Connect in accordance with the standard wiring diagram, and
set High/Low switch to required position (see below), ensure that cable gland and back cover are fully
tightened when finished. The DIGIMATIC has two 20mm cable entries, one of which is blank, the blank
may be drilled out carefully if required; it must not be knocked out.
The unit should be wired and earthed in accordance with appropriate Electrical Regulations. The unit must
be earthed and the terminal MUST be bonded to the earth bond stud. On metal containers, unit earth MUST
be bonded to the container. If the container is non-metallic, metal fl anges or couplings used to mount probe
should be bonded to earth. This also applies to probes mounted in wooden or plastic tops of metal bins.
Fail Safe Setting
The “High/Low” switch, sets the fail safe mode. In the “High” position, the relay is de-energised with material present. In the
“Low” position, the relay is energised with material present. Normally, the “High” position is used for high level probes and the
“Low” for low level probes. Intermediate probe settings depend upon individual requirements.
WARNING
Proper spacing of the power shield is vital for correct operation. For questions regarding proper spacing
of the power shield to the vessel wall, contact 4B.