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Related Manuals for jenway 370
Summary of Contents for jenway 370
- Page 1 MODEL 370 pH/mV METER OPERATING MANUAL 370 350/REV A/10-03...
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Page 2: Table Of Contents
MODEL 370 pH/mV METER OPERATING INSTRUCTIONS CONTENTS Introduction Specification Installation Displays Controls Operation Calibration Error Codes mV Mode Manual Temperature Compensation Auto Shut Off Data Storage Good Practice Guidelines Maintenance Troubleshooting Guide 13-14 Checking pH Electrode Function Checking pH Meter Function... -
Page 3: Introduction
METER OPERATING INSTRUCTIONS INTRODUCTION The Model 370 is a general purpose hand held pH/mV meter offering a 1 or 2 point calibration and automatic buffer recognition with manual override. The custom liquid crystal display simultaneously shows temperature compensated pH readings or electrode potential and temperature. -
Page 4: Installation
INSTALLATION Unpack the instrument and ensure the following items are present: 1. Model 370 pH/mV Meter (370 201) 2. Epoxy bodied combination pH electrode (924 001) 3. Temperature/ATC probe (027 500) 4. pH4, 7 & 10 buffer sachets 5. 2 x AA alkaline batteries (021 007)(fitted) Optional accessories which may have been ordered: 1. - Page 5 Secondary display - 4 digit display showing temperature (manual temperature compensation value or ATC probe temperature, if connected) in °C or °F. In the event of a calibration error the display will show an error code momentarily (if the reading is outside the range of -10 to 105°C / 14 to 220°F) at the same time as the primary display indicates the erroneous reading.
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Page 6: Controls
KEYPAD CONTROLS STO RCL STO stores the current data reading. RCL enters recall mode to view the stored readings. Switches the instrument on and off. This key should be pressed and held for 1-2 seconds to operate. The instrument will automatically switch off after 30 minutes if no key is pressed. -
Page 7: Operation
CALIBRATION The 370 features a one or two point calibration. For the best results we recommend that the 370 is calibrated with buffer solutions that are close to the sample value, where possible. For example: when working at pH5.5 we recommend calibrating at... - Page 8 recognition feature will be disabled. To retrieve the auto buffer recognition values it is necessary to exit the calibration sequence by pressing the MODE key). To exit the cal sequence at any point, press the MODE key. Rinse electrode(s) in deionised water between measurements.
- Page 9 The primary display will show a reading close to the buffer value based on the last successful calibration. For automatic calibration to one of the pre-programmed buffer values wait for the reading to stabilise and then press the CAL key again to update the display to the temperature corrected value for the buffer used (refer to the buffer value tables on buffers used).
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Page 10: Error Codes
ERROR CODES Refer to Troubleshooting Guide for possible causes of error codes. If a problem is detected during calibration the following error codes will be displayed: This indicates that the calculated electrode offset at pH7 is Err1 outside the range of -30 to +30mV. The error code will be displayed for 3 seconds on the secondary display, together with the erroneous electrode offset value in mV on the primary display. -
Page 11: Manual Temperature Compensation
This range is also useful for monitoring the performance of standard pH electrodes. Using accurate and fresh buffers at a constant temperature the mV output of the electrode should be noted and compared to the theoretical ideal. As the electrode ages, becomes contaminated or dirty, these values will drift, indicating that corrective action should be taken. -
Page 12: Data Storage
DATA STORAGE The 370 can store up to 32 readings. Storage is intiated by manual key press. Storing Data Pressing the STO key stores the current reading in the next available data location. The storage location is indicated by Sto and a number (1-32) momentarily displayed for the data. -
Page 13: Good Practice Guidelines
GOOD PRACTICE GUIDELINES The types of pH electrodes are many and various. The supplied epoxy combination electrode is suitable for the majority of tests carried out on aqueous solutions. For other applications, such as low ionic strength, high temperatures and strongly acidic solutions a more suitable pH/ reference electrode pair may be required. -
Page 14: Maintenance
MAINTENANCE CLEANING/RE-CONDITIONING OF GLASS ELECTRODES For general purpose use, combination electrodes can be cleaned with a mild detergent solution or a commercial glass cleaning solution (provided these are not strongly acidic). The electrode surface should be wiped with a clean cloth soaked in the cleaning agent, and/or allow the membrane to stand in the solution until clean. -
Page 15: Troubleshooting Guide
TROUBLESHOOTING GUIDE FAULT ACTION PROBABLE CAUSE Replace batteries Battery failure No power Battery polarity incorrect Refit batteries Use correct value Incorrect value buffer used Cal error Use fresh buffer Contaminated buffer solution 1, 2 or 3 solutions pH electrode defective Replace pH electrode Cal error Recalibrate on 2... -
Page 16: Checking Ph Electrode Function
TROUBLESHOOTING GUIDE FAULT PROBABLE CAUSE ACTION Back light not 10 second time Recheck on/goes out elapsed/normal function Unable to Incorrect mode of Reselect mode adjust manual operation temperature ATC probe connected Disconnect probe MAN displayed Defective ATC probe Replace ATC probe when ATC probe connected... -
Page 17: Checking Ph Meter Function
The slope of the electrode can be calculated from: Slope % = k + Eo x 100 177.48 This value should be in the range of 75% to 125%. If any of the parameters are outside the limits given the electrode is faulty and should be replaced. -
Page 18: Battery Replacement
Refit the battery compartment cover, ensuring that the fixings are secured into place, but are not overtightened. OPTIONAL ACCESSORIES The following list of items are available for use with the Model 370: 033 268 Carrying Case 025 179... -
Page 19: Ec Declaration Of Conformity
EC Declaration of Conformity JENWAY Model 370 pH/mV Meter complies with the following European Standards: EN 50081-1:1992 Electromagnetic compatibility - Generic emission standard EN 61326:1998 Electrical equipment for measurement, control and laboratory use - EMC requirements EN 61010-1:1993 Safety requirements for electrical... - Page 20 Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)1245 600560 Fax: +44 (0)1245 600030 Email: sales@keison.co.uk...
- Page 21 Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)330 088 0560 Fax: +44 (0)1245 808399 Email: sales@keison.co.uk...