804-R010-330 datasheet(6/32 Pages) MAGNETROL

6 / 32 page

50-604 Kotron Model 804 Sentinel II RF Level Transmitter

Tanks/Silos with Non-Conductive Materials

of Construction

With plastic, concrete, wood, or any other non-conductive

walled vessel, the reference electrode (mentioned in the

Principle of Operation section on page 1) needs clarifica-

tion. Most commonly, this electrode will be in the form

of a concentric ground tube (for example, a stilling well).

In questionable circumstances, consult the factory. In all

cases, a good electrical connection must be made between

the ground surface and the probe housing.

NOTE: These comments also apply to glass-lined, metal walled tanks.

Caution: When an insulated probe is used in a hazardous and/or

abrasive medium, the probe should be inspected annually

for nicks, cuts, or abrasions, which may ruin the integrity of

the insulation. In the event that wear is found, replace the

probe or consult the factory for further instructions. This

procedure is critical in vessels containing hazardous media.

2.2

Mounting

Probes should be mounted vertically and such that the

probe rod is at least 2" (50 mm) below the lowest

desired level control point with conductive materials; or,

4" (100 mm) below the lowest desired level control point

in non-conductive materials. Refer to Figure 1.

2.2.1 Mounting Procedure

Kotron Sentinel II Transmitters with standard probes up to

and including 12" (305 mm) in length are shipped pre-

assembled. Units with standard probes over 12" (305 mm)

in length are shipped unassembled to avoid damage during

transit; and must be assembled before mounting. Follow

the proper mounting procedure for specific unit.

NOTE: Before beginning mounting procedures, ensure that the power

source to the unit is off. After installing the probe on the tank,

and before wiring the electronics to the probe, it is beneficial

to perform a probe resistance check to verify the integrity of

the probe.

The resistance of an insulated probe in conductive liquid (or a

bare probe in non-conductive media), when measured

between the probe screw terminal and the probe mounting

nut with an ohmmeter set to its 20 megohm scale, should

be INFINITE.

2.2.2 Integral Mount with Standard Rigid Probe

1. Thread probe into mounting bushing on tank.

2. Tighten securely—being certain that the wrench is applied

only to the lower probe nut.

Figure 1

Mounting nut

Tank

mounting

bushing

Actuation

point in

conductive

media

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