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2.2 Sensor and head amplifier installation
Make sure that there is room inside the tank for the sensor without anything touching it, and that the
gap is not obstructed. At least an inch of clearance must be left around Hi-Sens senors. The head
amplifier should have its cable glands downwards if possible to reduce the possible to reduce the
possibility of ingress of rainwater.
For threaded sensors a hole is drilled in the tank at the appropriate level, and this is tapped to take
the sensor. On thin walled tanks it may be necessary to fit a boss to the tank. Use PTFE tape or
similar to seal the thread so that the sensor does not have to be over-tight for a good seal, as this may
damage the sensor. The sensor should be screwed in using a spanner on the hexagonal fitting, not by
turning the sensor head unit. It is assumed that the sensor will be earthed through the tank.
For flanged sensors, arrange a suitable counter flange, and fit using a gasket, tightening the bolts
evenly. If possible the bridge of sensors 302S and 402S should be to the side of the gap, and not above
or below it, and all gap sensors should have their gaps vertical. This is so that any sludge in the tank
cannot settle on the faces of the sensor.
Interface probes 402S and 433S may be mounted at an angle of 10º to the horizontal so that they can
be used in either attenuation or reflection mode. Mounting details for the adjacent head amplifier are
shown in Figure 2.3. Both model types MEP*AI and MEP*XI adjacent mounted amplifiers have a sensor
cable continuity check system built in. This cable check is only operative when one of the following
sensors is in use.
30HS, 302S, 312S, 312SP, 323S, 352S, 362S, 373S, 393S, 402S, 433S
The cable check circuit is activated by breaking Link 3, positioned next to the A & B terminals. (See
Figure 2.1)
56.0
24.0
120.0
90.0
15.0
OF FIXING HOLES
4 FIXING HOLES
Ø 4.5mm
122.0
110.0
OF FIXING HOLES
25.0
44.0 32.0
Figure 2.2 - Adjacent head
amplifier mounting details