Table of Contents
Related Manuals for wtw FDO 925
Summary of Contents for wtw FDO 925
- Page 1 OPERATING MANUAL ba75898e06 08/2015 ® ® 925-P ® ® 925-P OPTICAL D.O. SENSOR For Sales & Service Contact 2650 E. 40th Ave. • Denver, CO 80205 Phone 303-320-4764 • Fax 303-322-7242 1-800-833-7958 www.geotechenv.com...
- Page 2 For the most recent version of the manual, please visit <hyperlink>www.si-analytics.com. Copyright © 2015, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany. ba75898e06 08/2015...
-
Page 3: Table Of Contents
® Contents ® 925 - Contents Overview ........4 1.1 Structure and function . -
Page 4: Overview
® Overview Overview Structure and function ® Structure FDO 925 ® FDO 925-P Shaft Connecting head with active sensor electronics ® Connection cable (FDO 925) ® IDS plug (FDO 925-P) Protective hood, with connection for RZ 300 stirrer (accessory) Sensor membrane ®... -
Page 5: Recommended Fields Of Application
Details on the firmware update are given in the current operating manual of your meter. The current operating manual of your meter and the firmware update for the sensor are available on the Internet under www.WTW.com. Recommended fields of application Recommended ... -
Page 6: 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: ... -
Page 7: Opening And Closing The Ids Plug Connection
® Measuring / Operation ® Opening and closing the IDS plug connection (FDO 925-P) This section only applies to the IDS plug variant, ® Plug connection closed and locked Guidance Groove Opening the plug If necessary, clean the plug connection connection ... -
Page 8: Measuring
® Measuring / Operation Measuring Minimum depth of Observe the required minimum immersion depth (see chapter 5 T ECHNICAL immersion DATA ® Incident flow The FDO 925 D.O. sensor enables precise measurements without any inci- dent flow. However, an incident flow of the sensor membrane improves the responding behavior of the sensor (see chapter 5 T ). -
Page 9: Storage
® Measuring / Operation the lid. After inserting the sensor, wait for the temperatures of the sensor and cali- bration vessel to adjust. The steps of the check or user calibration are described in detail in the operating manual of the meter. Storage ®... -
Page 10: Maintenance, Cleaning, Replacement
® Maintenance, cleaning, replacement Maintenance, cleaning, replacement General maintenance instructions Handling of the Despite its exterior robustness, the sensor is a high precision optical instru- sensor cap ment. Therefore, special care should be taken when doing any maintenance or cleaning work: ... -
Page 11: Exchanging The Sensor Cap
® Maintenance, cleaning, replacement Exchanging the sensor cap Before removing the sensor cap, observe the general mainte- nance instructions in section 3.1. To exchange the sensor cap, proceed as follows: Removing the Pull the sensor out of the sample. sensor cap Clean the outside of the sensor (see section 3.3.1). -
Page 12: 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 13: Checking The Zero Point Of The Sensor
® Maintenance, cleaning, replacement 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) ... -
Page 14: What To Do If
® What to do if... What to do if... Error symptom Cause Remedy No temperature value – No connection between meter – Establish connection between or D.O. value and D.O. sensor meter and D.O. sensor – Cable defective – Return the D.O. sensor Measured value too –... -
Page 15: Technical Data
Technical data Technical data General features Measuring principle Optical measurement based on photolumi- nescence. Temperature sensor Integrated NTC 30 (30 kat 25 °C / 77 °F) Dimensions ® FDO 925: (in mm) 205.5 150.0 15.3 21.7 ® FDO 925-P: 252.1 150.0 15.3... - Page 16 ® Technical data Connection cable Lengths 1.5 or 3 m ® (FDO 925) Diameter 4.3 mm Smallest allowed Fixed installation: 20 mm bend radius Flexible use: 60 mm Plug type Socket, 4 pins IDS plug Connection type 4-pole, watertight plug connection with lock, reverse polarity protected ®...
- Page 17 ® Technical data Characteristic data Accuracy of D.O. measure- ± 1.5 % on delivery ment at 20 °C (68 °F) in air- saturated water Zero signal ≤ 0.02 mg/l O ≤ 0.2 % O saturation ≤ 0.4 mbar O partial pressure Response time at 20 °C (90 % of the final value display after) (68 °F) in stirred solution...
-
Page 18: Wear Parts And Accessories
IDS connection cable, 60 m AS/IDS-60 903 858 IDS connection cable, 100 m AS/IDS-100 903 859 Blind plug for IDS plug BPO/IDS 900 908 371 Further accessories are listed in the price list of the WTW catalog "Laboratory and field instrumentation". ba75898e06 08/2015... - Page 20 For more information on how Xylem can help you, go to www.xyleminc.com Wissenschaftlich-Technische Werkstätten GmbH Dr.-Karl-Slevogt-Straße 1 D-82362 Weilheim Germany Tel: +49 881 183-0 Fax: +49 881 183-420 E-Mail: info@wtw.com Internet: www.wtw.com...