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Summary of Contents for wtw MultiLine FDO 925
- Page 1 Operating manual ® Optical D.O. sensor ba75898defs01 04/2010...
- Page 2 The latest version of the present operating manual can be found on the Internet under www.WTW.com. © Copyright Weilheim 2010, WTW GmbH Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany. ba75898S01 04/2010...
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Page 3: Table Of Contents
® Contents Contents Overview ........21 1.1 Structure and function . - Page 4 ® Contents ba75898S01 04/2010...
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Page 5: Overview
® Overview Overview Structure and function Structure Shaft Connection head Fixing ring Sensor membrane ® SC-FDO 925 sensor cap with memory chip Gold-plated contacts for the memory chip of the sensor cap Locking device Measurement window O-ring Thermistor enclosure with temperature sensor Sensor cap with A memory chip is integrated in the sensor cap. -
Page 6: Recommended Fields Of Application
The digital transmission technique guarantees the failure-free communi- cation with the meter even with long connection cables. If the sensor firmware is enhanced by WTW, it can be updated via the meter. Recommended fields of application Recommended... -
Page 7: Measuring / Operation
® Measuring / Operation Measuring / Operation General information on the handling of the sensor cap Despite its exterior robustness, the sensor is a high precision optical instru- ment. Therefore, you should take the following precautions when dealing with ® the FDO 925: Please do not touch the sensor membrane with your fingers... -
Page 8: Function Check And User Calibration
® Measuring / Operation Function check and user calibration ® Factory calibration The FDO 925 is factory calibrated. In the recommended application (see page 22), the measuring characteristics of the sensor cap remain stable for the specified service life. Thus, a user calibration is not usually required. When does a func- A function check or user calibration can be useful in the following special tion check or user... -
Page 9: Maintenance, Cleaning, Replacement
® Maintenance, cleaning, replacement Maintenance, cleaning, replacement General maintenance instructions Handling of the Despite its exterior robustness, the sensor is an optical high precision instru- sensor cap ment. Therefore, special care should be taken when doing any maintenance or cleaning work: Dirt and moisture under the sensor cap can affect the functioning and shorten the service life of the sensor cap. -
Page 10: Exchanging The Sensor Cap
® Maintenance, cleaning, replacement Exchanging the sensor cap Note Before removing the sensor cap, observe the general maintenance instruc- tions in section 3.1. To exchange the sensor cap, proceed as follows: Removing the sen- Pull the sensor out of the sample. sor cap Clean the outside of the sensor (see section 3.3.1). -
Page 11: Cleaning The Sensor
® Maintenance, cleaning, replacement Cleaning the sensor 3.3.1 Exterior cleaning Dirt on the sensor can affect the measuring characteristics. Biological depos- its for example, consume oxygen and can, when occurring on the sensor membrane, impair the responding behavior and cause values that are too low. -
Page 12: Checking The Zero Point Of The Sensor
® Maintenance, cleaning, replacement Note If the sensor cap is visibly damaged it has to be replaced. Checking the zero point of the sensor There are two methods to check the zero point of the sensor: Measurement in a nitrogen atmosphere (recommended method) Measurement in a sodium sulfite solution according to DIN EN 25814/ ISO 5814. -
Page 13: What To Do If
® What to do if... What to do if... Error symptom Cause Remedy No temperature value or – No connection between meter – Establish connection between D.O. value and D.O. sensor meter and D.O. sensor – Cable defective – Return the D.O. sensor Measured value too –... -
Page 14: Technical Data
® Technical data Technical data General features Measuring principle Optical measurement based on photolumi- nescence. Temperature sensor Integrated NTC 30 (30 k at 25 °C / 77 °F) 201.5 Dimensions (in mm) 145.0 15.3 21.7 Weight 180 g (with 3 m cable) Materials Shaft Connection head... - Page 15 ® Technical data Measurement Measuring ranges at 20 °C 0 ... 20 mg/l D.O. conditions (68 °F) 0 ... 200 % D.O saturation 0 ... 400 mbar D.O. partial pressure Temperature range 0 ... 50 °C (32 ... 122 °F) Max.
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Page 16: Wear Parts And Accessories
D.O. measurement with flow-through quanti- ties from 25 to 65 ml/min. Protective armoring (synthetic material) A 925/K 903 836 Protective armoring (stainless steel) A 925/S 903 837 Note For further accessories, refer to the WTW catalog or the Internet. ba75898s01 04/2010...