822-1002-C01 Datasheet, PDF (10/40 Pages) Magnetrol International, Inc. – Kotron® Sentinel Models 822, 832 and 842

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.
3871
ENT
+ (Red)
– (Black)
Side View
Main Amplifier
+ (Red)
Probe
(white)
Shield
Q4
Q3
Q1
GP
U4
U2
U5
1.6.1 Main Amplifier
Side V
Preamp
Probe
(white
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.
Top View
Preamplifier
– (Black)
Shield cut
back and
taped
Figure 11
Remote Electronics with
Standard Rigid or Flexible Probe
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.
3871
ENT
+ (Red)
– (Black)
Guard
(red)
Shield
Probe
(white)
Side View
Main Amplifier
Side View
Preamplifier
GP
Q4
Guard
Q3
(red)
Q1
U4
Probe
U2
(white)
U5
+ (Red)
Top View
Preamplifier
– (Black)
Shield cut
back and
taped
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.
Figure 12
Remote Electronics
with Guarded Probe
6. Connect black lead to the negative (–) terminal on the
amplifier.
7. Connect the shield to the ground ( ) terminal on the
amplifier.
7
50-621 Kotron Sentinel Models 822, 832 and 842 RF Point Level Switches