822-1002-C01 datasheet(10/40 Pages) MAGNETROL

10 / 40 page

50-621 Kotron Sentinel Models 822, 832 and 842 RF Point Level Switches

1.6

Installing a Remote Unit

NOTE: Units with remote electronics are provided with the Main

Amplifier and a preamplifier. Probe connections are made to

the preamplifier. Refer to Section 1.5, Probe Installation for

details in installing the probe.

1.6.1 Main Amplifier

Remote amplifier assemblies are normally shipped from

the factory assembled into an “L” mounting bracket.

Install bracket in a location that will isolate the unit from

temperatures below -40° F (-40° C) and over +160° F

(+70° C) or vibration/mechanical damage. Unit can be

mounted up to 2500 feet (760 m) from probe assembly.

Intrinsically safe models can be mounted up to 800 feet

(240 m) from probe assembly. Location should also offer

easy access for wiring, calibration, and maintenance.

1.6.2 Preamplifier

1. Screw the preamplifier housing onto the probe until hand

tight. Housing can be wrench tightened to align conduit

connection with conduit.

2. Attach white wire from the probe to the connection on the

preamplifier – see Figure 11.

3. If using a guarded probe, attach the red wire from the

probe to the connection on preamplifier – see Figure 12.

1.6.3 Remote Wiring Connections

To connect preamplifier-to-amplifier, use shielded,

twisted pair, 22-gauge stranded connectors (part number

09-7146-001).

1. Strip approximately 0.4 inch (10 mm) of outer jacket insu-

lation from each end of the shielded, twisted-pair.

2. At the probe preamplifier end, cut the bare shield wire of

the cable close to the insulating jacket.

3. Connect the red lead to the positive (+) terminal on the

amplifier. Refer to Figure 11 or 12.

4. Connect the black lead to the negative (–) terminal on the

preamplifier board.

5. Connect the red lead to positive (+) terminal on the amplifier.

6. Connect black lead to the negative (–) terminal on the

amplifier.

7. Connect the shield to the ground (

) terminal on the

amplifier.

– (Black)

ENT

3871

Top View

Preamplifier

Side View

Preamplifier

+ (Red)

Shield

Guard

(red)

Probe

(white)

+ (Red)

Shield cut

back and

taped

Guard

(red)

Probe

(white)

Side View

Main Amplifier

– (Black)

Figure 12

Remote Electronics

with Guarded Probe

– (Black)

ENT

3871

Top View

Preamplifier

Side V

Preamp

– (Black)

+ (Red)

Shield

Probe

(white

+ (Red)

Shield cut

back and

taped

Side View

Main Amplifier

Probe

(white)

Figure 11

Remote Electronics with

Standard Rigid or Flexible Probe

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