Product Info
The 4690 Series Turbidity system comprises a 4690 / 4695 analyzer and a 7998 turbidity sensor. The analyzer provides the operator interface and communications to other devices. The signal from the turbidity sensor is converted by the analyzer and the information is presented on a large, custom-designed, easy-to-read, backlit liquid crystal display (LCD).
Preventive Maintenance Schedule
Every 5 Years:
- LED light source (ISO 7027) replacement kit
Quarterly:
- Wiper blade replacement
Parts List
- 7998 011 Sensor: Flow-through sensor with wiper unit, 0 to 40 NTU range (Part Number: Not Available)
- 7998 012 Sensor: Flow-through sensor with wiper unit, 0 to 400 NTU range (Part Number: Not Available)
- 7998 016 Sensor: Flow-through sensor without wiper unit, 0 to 40 NTU range (Part Number: Not Available)
- 7998 017 Sensor: Flow-through sensor without wiper unit, 0 to 400 NTU range (Part Number: Not Available)
Product Specs Sheet
- Sensor Range: Low range 0 to 40 NTU, High range 0 to 400 NTU
- Measurement Principle: 90 ° scattered light measurement, Compliant to ISO 7027
- Maximum Linearity: Typically <1.0 %
- Accuracy: Low range version ±2 % of reading, High range version ±5 % of reading or 0.3 NTU
- Repeatability: 0 to 200 NTU <1 %, 200 to 400 NTU 2 %
- Limit of Detection: Low range version: 0.003 NTU, High range version: 0.3 NTU
- Response Time: T90 < 1 min at 1 l/min-1
- Flow Rate: 0.5 to 1.5 l/min (0.13 to 0.39 gall [US]/min)
- Integral Wiper Cleaning System: Programmable operational frequency every 0.25 hour, 0.5 hour, 0.75 hour or multiples of 1 hour up to 24 hours
- Sample Operating Temperature: 0 to 50 °C (32 to 122 °F)
- Sample Pressure: Up to 3 bar (43.5 psi)
- Ambient Operating Temperature: 0 to 50 °C (32 to 122 °F)
- Ambient Operating Humidity: Up to 95 % RH
Troubleshooting
- Cal Fail:
- Repeat calibration.
- If using a dry calibration standard, ensure that the optical windows on the dry standard are clean and dry.
- If using solutions: Check that the flowcell has been thoroughly cleaned and rinse well between solutions, Check both zero and formazine solutions
- Check electrical connections to sensor.
- Using a suitable voltmeter, check the sensor 12 V supplies, both at the analyzer terminals and sensor junction box.
- Check the analyzer’s response to an electrical input by injecting 0 and 3 V. Small errors in displayed voltage can be removed by electrical calibration. Large errors indicate an electronic fault.
- Cleaner Fail:
- Check the electrical connections to the sensor.
- Using a suitable voltmeter, check the sensor 12 V supplies, both at the analyzer terminals and sensor junction box.
- Check operation of the wiper unit by disconnecting the white lead from the analyzer terminal block (Cleaner Initiate signal) and touching it briefly to the 0 V terminal.
- NV Memory Error:
- Switch off the power, wait 10 seconds and switch on again. If the problem persists contact the Company.
- Unstable or Erratic Readings:
- Check for air bubbles in the sample. Frequent cleaning of the optical windows helps to prevent the build-up of bubbles. If bubbles are observed it is recommended that the optional de-bubbler unit is installed.
- Where the noise level gradually gets worse over a period of time, this usually indicates that solids are building up in the flowcell. Increasing the flowrate through the flowcell may reduce this build up. Ultimately the flowcell needs to be cleaned manually.
- Intermittent Short Term Spikes in Turbidity Readings:
- The analyzer can be programmed for Bubble Rejection to remove short-term spikes from the readings. For optimum operation, operate the wiper unit frequently to prevent bubbles building up on the windows.
Please
note that any procedure, checklist, or other document available on Limble is provided for general education and
information only and does not constitute legal, medical, or financial advice. Limble makes the materials available
AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the
risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any
such use, including compliance with applicable law and with meeting any conditions of product warranties. It is
recommended to contact OEM for the most accurate information.
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