Manual

ManualsBrandsSOR ManualsSensorsSingle Point Ultrasonic Level Switch

Form 771 (08.13) ©SOR Inc.

1/20

The Ultrasonic Point Level Control indicates liquid presence/absence within a sensor cavity.

Two piezoelectric crystals face each other across the sensor cavity. One crystal transmits

an ultrasonic signal; the other crystal receives the signal.

When the sensor cavity is empty, the receiver detects a weak signal because air is a poor

conductor of ultrasonic waves. The yellow LED is lit, indicating 8 mA current output.

When process liquid fills the sensor cavity, the receiver detects a strong signal because

liquids are good conductors of ultrasonic waves. The red LED is lit, indicating 16 mA

current output.

The Ultrasonic Point Level Control constantly monitors sensor integrity and changes the

current output in the unlikely event of a sensor failure. The Failure Mode Switch located

inside the control housing can be field selected to either 5 mA or 19 mA to indicate

sensor failure.

Remote Self-Test is provided with non-intrinsically safe units only. Units equipped with

two terminal blocks feature the remote self-test. A dry contact may be used up to 50

feet/15 meters from the control to simulate a sensor failure.

Standard 316SS and Te on Notch-Type sensors, epoxy tip-sensitive, and 316SS viscous

sensors are available for use with the point level control. Extreme care must be taken when

installing units with Teflon

sensors. See installation instructions beginning on page 2.

Ultrasonic Two-Wire

Point Level Control

General Instructions

Registered Quality System to ISO 9001

Design and

specifications are

subject to change

without notice.

For latest revision,

go to 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

Installation ....................................... 3

Remote Cable Connection .....................4

Remote Electrical Connection ................4

Electrical Connection ...........................5

Calibration and Function Test .................8

Sensor Replacement ...........................9

Circuit Board Replacement ....................9

CE Marked Units .............................. 10

Control Drawings ............................. 11

Troubleshooting ............................... 16

Dimensions ................................ 17-19

Summary of content (20 pages)

PAGE 1
Ultrasonic Two-Wire Point Level Control General Instructions The Ultrasonic Point Level Control indicates liquid presence/absence within a sensor cavity. Two piezoelectric crystals face each other across the sensor cavity. One crystal transmits an ultrasonic signal; the other crystal receives the signal. When the sensor cavity is empty, the receiver detects a weak signal because air is a poor conductor of ultrasonic waves. The yellow LED is lit, indicating 8 mA current output.
PAGE 2
Installation Notch-Type and Epoxy Sensors (Series 371-N and 371-E) Ultrasonic Level Sensors can be mounted by inserting the sensor through a fitting in a vessel, or over an open sump or basin. Special care must be taken when installing Teflon® sensors. Irreparable damage may be done to Teflon sensors by turning metal hex and Teflon hex separately. Always rotate metal hex and Teflon hex simultaneously. Do not apply more than 10 in. lbs. of torque to either hex during installation.
PAGE 3
Open Sump or Basin Do not suspend the unit by rigid conduit installed in the electrical hub. When installing the unit over an open sump or basin, use a suitable bracket to support the instrument. NOTE: The instrument must be positioned so that overflow does not flood electrical housing. (See Open Sump Locally Supplied Bracket ) CE Marking Sensor Installation (notch type sensors only, Series 371-N) Shield Beads Three beads are included with your CE marked unit. Two of the beads are 5/8” dia x 1/2” long.
PAGE 4
Remote Cable Connection Conduit must be installed between the sensor base and the electronics housing to provide ) The sensor base and the electronics a raceway for sensor extension cables. (See housing are suitable for use in Class I Group C & D; Class II Groups E, F & G; Division 1 & 2 Hazardous Locations. All conduit and fittings used for the installation must equal or exceed this rating to maintain the explosion proof integrity of the assembly.
PAGE 5
Connect extension lead T to OUT 2 Remote Interconnect Board located inside sensor base Connect extension lead A to OUT 1 OUT connections are located on the opposite side of the board from the IN connections. Do not use positions 3 & 4 to connect wires. Connect short sensor lead (T) to IN 2 Connect long sensor lead (A) to IN 1 Discharge the Sensor Temperature changes which occur during shipment may result in a small electrical charge inside the sensor crystals.
PAGE 6
Maximum Loop Resistance (Ohms) (including Barrier Resistance) Loop Resistance vs.
PAGE 7
Electrical Connection (Intrinsically Safe) Intrinsically Safe Models (does not apply to viscous or epoxy controls and sensors): Any model numbers containing the designators “AI”, “CI” or “FI” are listed Intrinsically Safe with CSA (AI), CENELEC (CI) or FM (FI). Please note the housing nameplate to determine the Agency Approval of your instrument. Connections must be as shown on the SOR Control Drawings shown on pages 8-12. AI CSA Intrinsically Safe...................Class I, Div.
PAGE 8
Calibration and Function Test No calibration is needed. Units are calibrated at the factory. No user adjustments are required. TB2 Remote Self-Test Terminal Block (Optional) Electrical power must be disconnected from explosion proof models before the cover is removed. Failure to do so could result in severe personal injury or substantial property damage.
PAGE 9
LED on LED off Current Output Chart Yellow LED (Dry) Red LED (Wet) Current Meter (+ 1mA) Sensor Status   8 mA Dry __   16 mA Wet __   5 mA __ 5 mA   19 mA __ 19 mA Failure Mode Sensor Replacement  Disconnect power to the unit.  Remove the housing cover.  Remove two mounting screws and slide out PC board to expose the sensor connections J1 and J2. (See )  Disconnect the sensor wires from J1 and J2.  Unscrew the sensor from the housing.
PAGE 10
 Discharge the sensor. Connect the center conductor and shell of sensor wire end as ) shown on page 5. (See  Connect the sensor plugs to the new board. The sensor wire (T) plugs into J2 (transmit). The sensor wire (A) plugs into J1 (receive).  Replace the two mounting screws into the plastic ring. These screws are self-tapping. Do not overtighten. Replacement Circuit Boards Match the characters of your model number with those shown below to select the proper replacement board part number.
PAGE 16
Troubleshooting Symptom/Problem Possible Cause Corrective Action No current in the loop No LEDs lit. 1. Power supply turned off. 2. Improperly wired terminal block TB1. 3. Broken power supply wire. 1. Check power supply source. 2. Check terminal block wiring per (page 5) 3. Check loop wire integrity. Current 5 or 19 mA. No LEDs lit or both LEDs lit. 1. Sensor lead unplugged. 2. Sensor integrity is compromised. 3. Remote Self-Test activated. 1. Check sensor cable connections. 2. Replace the sensor. 3.
PAGE 17
Dimensions Metal Sensor 116.7 4.59 95.3 3.75 96.0 3.78 50.8 2.00 ADD FOR K2 HSG K1 HSG 210.8 * 8.30 ELECTRICAL CONNECTION 3/4 NPTF STD 1/2 NPTF OPT 93.3 * 3.67 15/16 WRENCH FLATS PROCESS CONNECTION SEE CHART A 15.9 0.63 SENSOR CAVITY 20.6 0.81 22.2 0.88 Linear = mm/inches CONNECTION SIZE * LENGTH Drawing 0390000 3/4 NPT(M) SHOWN Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Form 771 (08.13) ©SOR Inc. 1 NPT(M) ADD 8.0 0.
PAGE 18
Teflon Sensor Linear = mm/inches Drawing 0390002 18/20 Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Form 771 (08.13) ©SOR Inc.
PAGE 19
Viscous Sensor Linear = mm/inches Drawing 0390439 Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Form 771 (08.13) ©SOR Inc.
PAGE 20
Printed in USA sorinc.com 14685 West 105th Street, Lenexa, KS 66215  913-888-2630  800-676-6794 USA  Fax 913-888-0767 20/20 Registered Quality System to ISO 9001 Form 771 (08.13) ©SOR Inc.