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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.)
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.
Design and
specifications are
subject to change
without notice.
For latest revision, go to
www.sorinc.com
Form 924 (05.18) ©SOR Inc.
RF Point Level Control
with Sensor Monitor

Table of Contents

Specifi cations ...................................2
Pre-Installation Test ............................3
Installation .......................................4
Remote Cable Connection .....................5
Electrical Connection ........................ 6-7
Sensor Replacement ......................... 10
Troubleshooting ............................... 10
Circuit Board Replacement .................. 11
Varistor Replacement ........................ 11
Fuse Replacement ............................ 12
Dimensions ................................ 13-16
Registered Quality System to ISO 9001
General Instructions
ing.
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1/16

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Summary of Contents for SOR 681 Point Level Control

  • Page 1: Table Of Contents

    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).
  • Page 2: Specifi Cations

    Repeatability ........................ 0.5% Adjustable differential range ................0 - 1000pF Response time ....................<100 msec Power at sensor ....................<10 μ joules Electrostatic discharge (ESD) protection IEC 1000-4-2 compatible Electrical conduit connection ................3/4” NPT(F) 2/16 Form 924 (05.18) ©SOR Inc.
  • Page 3: Pre-Installation Test

    To detect an interface, such as oil/water or foam/liquid, the lighter material must be on the sensor, then tuned out. Then move the LEVEL adjustment to detect the heavier process material. (See Water 3/16 Form 924 (05.18) ©SOR Inc.
  • Page 4: Installation

    Re-calibration is required if the probe length is changed. Conduit must be installed between the sensor base and the electronics housing to provide a raceway for sensor extension cables. (See 4/16 Form 924 (05.18) ©SOR Inc.
  • Page 5: Remote Cable Connection

    Terminal Block Remote Sensor Board Remote Board Terminal Block Probe Connector Electronics Housing Conduit must meet Class I Group C & D; Sensor Base Class ll Groups E, F & G; Division 1 & 2 5/16 Form 924 (05.18) ©SOR Inc.
  • Page 6: Electrical Connection

    2. Connect positive line power wire to the terminal marked (+). 24 VDC 3. Connect negative line power wire to the terminal marked (–). (681K6) 4. Replace cover. 5. Apply power as desired. 6/16 Form 924 (05.18) ©SOR Inc.
  • Page 7: Sor Rf Probe Grounding Scheme

    Red LED Yellow LED Adjustable Differntial Adjustments (Function only on units with AD accessory) Remote Probe Terminal Block (Remote units only) SOR RF Probe Grounding Scheme SOR RF Probe Grounding Scheme Critical Grounding Path = Circuit Board Power Supply Line...
  • Page 8: Set Point And Sensor Monitor Calibration

    Rotate DIFFERENTIAL adjustment 25 turns clockwise, or until you hear the potentiometer click.  Look at the chart below to determine the correct failsafe switch setting for your application. Continuity Chart Switch Position Process Level Terminal Continuity Fail Safe Fail Safe 8/16 Form 924 (05.18) ©SOR Inc.
  • Page 9: Adjustable Differential Calibration

    Turn the screw head of the DIFFERENTIAL adjustment clockwise until you see the LEVEL LED change from on to off, or off to on. You will also hear a click as the relay contacts change state. 9/16 Form 924 (05.18) ©SOR Inc.
  • Page 10: Sensor Replacement

    4. Circuit failure periodically remove the build-up 4. Replace circuit board If corrective action is not effective, please consult the factory. NOTE: Agency certifi ed units, (FM, CSA, IEC) must be returned to SOR for repairs. 10/16 Form 924 (05.18) ©SOR Inc.
  • Page 11: Circuit Board Replacement

    Unplug the varistor(s) (RV1, RV2, RV3) located on the opposite side of the circuit board from the wiring terminals. (See  Plug in replacement varistor(s).  Replace the housing cover. Re-connect power to the unit. 11/16 Form 924 (05.18) ©SOR Inc.
  • Page 12: Fuse Replacement

     Plug in replacement fuse.  Replace the housing cover.  Reconnect power to the unit. Relays Transformer Location (120VAC and 240VAC only) Reverse Side of Printed Circuit Board 12/16 Form 924 (05.18) ©SOR Inc.
  • Page 13: Dimensions

    Dimensions Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Linear = mm/inches Drawing 0390654 13/16 Form 924 (05.18) ©SOR Inc.
  • Page 14 Dimensions Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Linear = mm/inches Drawing 0390653 14/16 Form 924 (05.18) ©SOR Inc.
  • Page 15 Dimensions Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Linear = mm/inches Drawing 0390653 15/16 Form 924 (05.18) ©SOR Inc.
  • Page 16 Printed in USA www.sorinc.com 14685 West 105th Street, Lenexa, KS 66215  913-888-2630  800-676-6794 USA  Fax 913-888-0767 16/16 Registered Quality System to ISO 9001 Form 924 (05.18) ©SOR Inc.

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