• Product Description• Specifications
• Sensor Mounting
• Pricing
• Product Description• Specifications
• Sensor Mounting
• Pricing
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If you have technical questions on our products, please refer to the appropriate troubleshooting guide below (Model 850 or
Model 950). If
you do not find the answer to your question here, please refer to our detailed installation and instruction manuals:
Problem Possible Causes Check/Remedy No response/meter reading blank No power Blown fuse Faulty sensor bulb Check power light. Check fuse. Check to see if sensor lamp is on. If lamp is off, check voltage across terminals 5 & 6 in sensor. If voltage is
greater than 7 VDC, then sensor has failed. Meter will not zero (high reading) Too much scattered light Too much ambient light or too much reflected light Poor sensor connections or incorrect wiring Sensor leads not insulated from body of sensor or conduit Wet connection in converter or sensor housings Defective sensor/transmitter Remove sensor and place in clean water with a cover to shield ambient light. Disconnect wires on terminals 5 & 6. If meter still will not zero then ambient light is entering pipe. If meter will zero, then too much reflected light. Try repositioning the sensor to reduce reflection.
Unstable reading Air bubbles or very large particles in process line RFI pickup Heavy Inductive loads Take sample and check for bubbles or large particles. If present relocate sensor. Earth ground instrument properly. Mount instrument away from power cables. Put cables in conduit. Reading does not agree with lab results Improper calibration Lab procedure error Lab instrument error Defective sensor Recalibrate instrument. Check procedure. Check instrument. Refer to supplier. Readings drift with time Converter not warmed up
Warm up converter for 15 minutes.
Remove sensor and clean. Negative readings or negative output Wet or damp connections
Dry connections with hair dryer. Then use NEMA 4X enclosure.
Problem Possible Causes Check/Remedy Meter indication is blank No power Blown fuse No power to instrument Faulty transmitter/indicating meter Check power light. Check fuse. Check for proper voltage on terminals 8 & 9. Refer to supplier. Meter will not zero Too much absorbed light
Sensor leads not insulated from body of sensor or conduit
Remove sensor and place in clean water. If the meter does not zero then try adjusting CS(course zero) on the circuit board.
No response (indication does not change and indication is high) Faulty sensor bulb Check to see if sensor lamp is on. If lamp is off, check voltage across terminals 5 & 6 in sensor. If the proper voltage (8 to 11VDC) is on terminals 5 and 6 and the bulb in the sensor is not on, then the bulb has failed. Unstable reading Insufficient dampening Air bubbles or very large particles in process line
Increase dampening. Take sample and check for bubbles or large particles. If present, relocate sensor.
Reading does not agree with lab results Improper calibration Lab procedure error Lab instrument error Defective sensor/transmitter Recalibrate instrument. Check procedure. Check instrument. Refer to supplier. Readings drift with time Converter not warmed up
Warm up converter for 15 minutes.
Negative readings or negative output Improper calibration Recalibrate instrument.
Check connections and wiring.
Check sensor wires.
Look for water or condensate on connections.
Remove all sensor wires at transmitter. If meter will not zero turn span full counter clockwise. If meter still will not zero, transmitter is bad. If meter will zero then sensor possibly has failed.
Sensor/converter connections wet
Deposit buildup on sensor
Look for water or condensate on connections. Dry connections with hair dryer. Then use NEMA 4X enclosure.
Faulty sensor bulb
Check to see if sensor lamp is on. If lamp is off, check voltage across terminals 5 & 6 in sensor. If voltage is
greater than 7 VDC, then sensor has failed.
Poor sensor connections or incorrect wiring
Wet connection in converter or sensor housings
No power to sensor
Faulty sensor bulb or defective sensor/transmitter
Check connections and wiring.
Check sensor wires.
Look for water or condensate on connections.
Voltage should be 7-10 VDC between terminals 5 and 6 on the main circuit board. Also, there should be 6-9 VDC on terminals 5 and 6 of the circuit board in the sensor.
If the proper voltage (8 to 11VDC) is on terminals 5 and 6 and the bulb in the sensor is not on, then the bulb has failed.
RFI pickup
Heavy inductive loads
Earth ground instrument properly.
Mount instrument away from power cables. Put cables in conduit.
Sensor/converter connections wet
Deposit build-up on sensor
Look for water or condensate on connections. Dry connections with hair dryer.
Remove sensor and clean.