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Smart Wireless pH Sensor

pH Sensor Pack (Bluetooth)

(Product No. 1110PK)

DS156 No 2

Data Harvest Group Ltd.1 Eden Court, Leighton Buzzard, Beds, LU7 4FY
Tel: 01525 373666, Fax: 01525 851638
e-mail: [email protected] or [email protected]
www.data-harvest.co.uk



Data Harvest. Freely photocopiable for use within the purchasers establishment

pH Glass Electrode (BNC)

(Product No. 2253)

pH Adaptor (Bluetooth)

(Product No. 1110)

Содержание Smart Wireless 1110

Страница 1: ... Court Leighton Buzzard Beds LU7 4FY Tel 01525 373666 Fax 01525 851638 e mail sales data harvest co uk or support data harvest co uk www data harvest co uk Data Harvest Freely photocopiable for use within the purchasers establishment pH Glass Electrode BNC Product No 2253 pH Adaptor Bluetooth Product No 1110 ...

Страница 2: ...ation graph 14 Buffers 16 Limited warranty 16 Introduction The Smart Wireless pH sensor is both USB ad Bluetooth compatible and can wirelessly connect to mobile devices such tablets and mobile phones as well as desktop or laptop computers giving students the ability to run experiments independently without being tethered to a traditional data logger See the EasySense2 user manual system requiremen...

Страница 3: ...ashing Recording data To switch the pH sensor off Press and hold down the On Off switch for about 2 seconds until the white light is lit solidly then release If not communicating with the EasySense2 software the sensor will puts itself to sleep after a period of about one hour of inactivity blue LED flashing The pH electrode BNC This is a general purpose plastic bodied single junction gel filled g...

Страница 4: ...charging Step 2 Open the EasySense2 app Lab Setup will open showing the Smart pH sensor as connected Devices icon green The status light on the pH adaptor will flash green to indicate a connection is established If connecting via Bluetooth Step 1 Short press the switch to turn the pH adaptor on blue LED will flash Step 2 Open the EasySense2 app Step 3 Lab Setup will open select the red Devices ico...

Страница 5: ... in a downward motion like a clinical thermometer 4 Screw on the clear plastic protective skirt if it s not already attached 5 Connect the pH electrode to the pH adaptor line the pins up to the slots push in and twist the electrodes BNC connector until it locks into place Note To disconnect twist the BNC connector in the opposite direction and pull Measurement procedure 1 Connect the pH sensor 2 R...

Страница 6: ...es have a finite lifespan due to their inherent properties How long a pH electrode will last will depend on how it is cared for and the solutions it is used to measure Even if the electrode is not used it will still age Always use freshly prepared pH buffers When not in use pH buffers should be stored in sealed containers High pH buffers are less stable as they tend to absorb atmospheric CO2 which...

Страница 7: ...ost investigations The calibration is set for operation at a temperature of 25 C 1000 mV This range gives the reading in mV and can be used in experiments on calibrating a pH sensor using buffer solutions of known pH values See page 14 An ideal would be that the potential is zero mV when the pH is 7 but in a real pH system this is rarely so it is normally between 20 mV and 20 mV This range can als...

Страница 8: ...ode has aged to the point where its glass membrane has changed resistance samples to be measured are at a lower or higher temperature than 25 C The buffer solutions used to set values must be at the same temperature as the samples in the experiment Buffers values are temperature sensitive enter a pH value for the buffer at that temperature Values of pH buffers a various temperatures Temperature C ...

Страница 9: ...ergy radio single mode compliant Transmit TX power 0 dBm Receiver RX sensitivity 90 dBm Usable transmission range up to 10 m in open air Frequency Range 2 402 to 2 480 GHz operation pH Electrode Range 1 pH 0 00 to 14 00 pH Resolution 0 01 pH Range 2 1000 mV Resolution 1 mV Range 3 User pH 0 00 to 14 00 pH Resolution 0 01 pH E 0 20 mV 25 C Slope pH 4 00 6 86 95 Electrode Diameter 12 to 13 mm Electr...

Страница 10: ...gives a flash of blue light then release If the sensor still fails to respond contact Product Support at Data Harvest Please provide details of The computer platform it is being used with and the EasySense2 software s version number A description of the problem being encountered If possible telephone from a location where you can operate the sensor with the computer Electrode maintenance The glass...

Страница 11: ...When the pH value is less than 7 the activity of hydrogen ion is greater than that of the hydroxide ion and the solution is described as acidic Conversely as the hydroxide ion activity is increased the solution becomes alkaline or basic and the pH value is greater than 7 The pH electrode is actually a combination of a two half cells electrodes within a single body Internal pH Half Cell the measuri...

Страница 12: ...emperature compensation is needed will depend on the level of accuracy required Trouble shooting Wild readings check for air bubbles in the electrode tip Response time and stability are affected by the condition of the electrodes glass membrane and reference solution Restoration to acceptable levels can often be accomplished by cleaning the electrode s glass surface Sluggish response erratic readi...

Страница 13: ...ould cover the bulb end of the pH electrode Do not remove the electrodes protective skirt the end is made from permeable glass which is fragile and easily damaged 4 Place a magnetic stir bar in the beaker and turn on the stirrer Check the stir bar rotates freely and does not make contact with the electrode 5 Open EasySense2 and select the Smart pH sensor as the device and the Titration template fr...

Страница 14: ...need a minimum of two buffers preferably three or more e g 4 7 and 10 If you are only using two then its best if one is a neutral buffer with a pH of 7 and the second is near to the expected pH of the samples you will be testing For example buffers with a higher pH 10 are best for measuring bases whereas buffers with a low pH 4 are best for measuring acidic samples Once you have chosen your buffer...

Страница 15: ...distilled water Dab or pat gently any excess water from the body of the electrode using a paper towel Place the pH electrode in the beaker of the second buffer solution allow the reading to stabilise and write down the mV reading and the pH value of the buffer Repeat for all buffers supplied Draw a graph with the pH buffer value on the X axis from 0 to 14 vs mV reading on the Y axis Draw a best fi...

Страница 16: ...m 3 potassium dihydrogen phosphate 10 0 214 cm3 0 1 mol dm 3 NaOH 1000 cm3 0 05 mol dm 3 sodium bicarbonate Limited warranty For information about the terms of the product warranty see the Data Harvest website at https data harvest co uk warranty Damage to the pH sensitive glass bulb is not covered by warranty FCC Details This device complies with Part 15 of the FCC Rules Operation is subject to t...

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