Form 924 (05.18) ©SOR Inc.
1/16
The 681 Point Level Control utilizes DPDT relays to provide switching
for peripheral devices (such as pumps) in level applications. A sensor
attached to the control acts as an antenna to transmit the process
material level to the electronics.
The failsafe switch allows the user to determine the relay state when
the process contacts the probe.
The 681 Point Level Control can be mounted with the sensor in the
process (integral units K housing), or up to 150’ (45m) from the
sensor in the remote configuration (R housing).
The 681 Point Level Control constantly monitors sensor integrity. In the
unlikely event of a sensor failure, a secondary relay provides alarm switching.
An optional adjustable differential circuit (AD accessory) allows the user
to select on and off level points for the control. (All adjustments will be
present, but only those corresponding to the accessory in the model
number will function.)
RF Point Level Control
with Sensor Monitor
General Instructions
Registered Quality System to ISO 9001
Design and
specifications are
subject to change
without notice.
For latest revision, go to
www.sorinc.com
NOTE: If you suspect that a product is defective, contact the factory or the
SOR
®
Representative in your area for a return authorization number (RMA).
This product should only be installed by trained and competent personnel.
Table of Contents
Specifi cations ...................................2
Pre-Installation Test ............................3
Installation .......................................4
Remote Cable Connection .....................5
Electrical Connection ........................ 6-7
SOR RF Probe Grounding Scheme ...........7
Set Point and Sensor Monitor Calibration ..8
Adjustable Differential Calibration ...........9
Sensor Replacement ......................... 10
Troubleshooting ............................... 10
Circuit Board Replacement .................. 11
Varistor Replacement ........................ 11
Fuse Replacement ............................ 12
Dimensions ................................ 13-16
ing.
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