961-20A0-010 Datasheet, PDF (8/36 Pages) Magnetrol International, Inc. – Ultrasonic Single and Dual Point Level Switches

2.4.2 Model 961 Loop-powered Wiring
For intrinsically safe installations, refer to the Agency
Drawing in Section 3.6.1. Loop wiring connections are
suitable for 12–24 AWG wire.
Hi 22
Lo 3.6
FAULT
TEST
MODEL 961
LOOP
TEST
8 16
F _TIME
A _DELAY
U
L
T
–+
Caution: OBSERVE ALL APPLICABLE ELECTRICAL CODES
AND PROPER WIRING PROCEDURES.
1. Make sure the power source is turned off.
2. Unscrew and remove housing cover.
3. Pull twisted pair wire through the conduit connection.
4. Refer to Figure 8. Connect wires to terminals (+) and (-)
on the terminal block. Unshielded cable may be used. If
shielded cable is used, attach shield to green head screw.
5. Prevent moisture seepage into housing by installing an
approved seal drain fitting in the conduit run leading to
Ground
Figure 8
–+
Model 961 Loop-Powered Wiring
the unit.
6. Wiring is complete. Replace housing cover.
Caution: In hazardous areas, do not power the unit until the
conduit is sealed and enclosure cover is screwed
down securely.
2.4.2.1 Model 961 Remote Transducer Housing Wiring
Remote mount Model 961 units have a “1” in the 8th
digit (961-XXXX-1XX) of the model number. The
037-3316-XXX cabling is connected at the factory on the
electronics end, and secured with a cable tie. The other
end of the cabling is connected by the user inside the
remote transducer housing at a terminal block marked as
1 2 3 4 on a blue label. See Figure 9.
NOTE: The 037-3316-XXX cabling is connected at the factory on the
electronics end. TB2 and TB3 connections are shown in
Figure 9 in the event the cable needs to be reattached.
Model 961 Loop-powered Remote Mount Wiring
Transducer Housing
Terminal Position
Wire
Electronics Terminal Block
& Terminal Position
Wire
1
Receive Shield
RECV
Receive Signal
TB3
2
Receive Signal
Receive Shield
3
Transmit Shield
XMIT
Transmit Signal
TB2
4
Transmit Signal
Transmit Shield
NOTE: The Signal wires are 30 AWG RG Type 178/U coax with the white jacket stripped off. The Shield wires
are prepared with solid tinned copper 22 AWG bus wire.
8
51-646 Echotel^® Model 961 & 962 Ultrasonic Level Switches