OPTISENS PH 9100 Handbook pH sensor The documentation is only complete when used in combination with the relevant documentation for the signal converter.
: IMPRINT ::::::::::::::::::::::::::::::::::::::: All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without the prior written authorisation of KROHNE Messtechnik GmbH. Subject to change without notice. Copyright 2012 by KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany) 2 www.krohne.
CONTENTS OPTISENS PH 9100 1 Safety instructions 5 1.1 Intended use ..................................................................................................................... 5 1.2 Safety instructions from the manufacturer ..................................................................... 5 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 Copyright and data protection ................................................................................................ 5 Disclaimer ................................
CONTENTS OPTISENS PH 9100 5.1 Maintenance ................................................................................................................... 37 5.1.1 Cleaning ................................................................................................................................ 37 5.1.2 Aging and re-calibration ....................................................................................................... 37 5.2 Spare parts availability...................................
SAFETY INSTRUCTIONS 1 OPTISENS PH 9100 1.1 Intended use CAUTION! Responsibility for the use of the measuring devices with regard to suitability, intended use and corrosion resistance of the used materials against the measured fluid lies solely with the operator. INFORMATION! The manufacturer is not liable for any damage resulting from improper use or use for other than the intended purpose. The intended use of OPTISENS PH 9100 sensor is the measurement of pH value in water applications.
1 SAFETY INSTRUCTIONS OPTISENS PH 9100 1.2.2 Disclaimer The manufacturer will not be liable for any damage of any kind by using its product, including, but not limited to direct, indirect or incidental and consequential damages. This disclaimer does not apply in case the manufacturer has acted on purpose or with gross negligence.
SAFETY INSTRUCTIONS 1 OPTISENS PH 9100 1.2.5 Warnings and symbols used Safety warnings are indicated by the following symbols. DANGER! This information refers to the immediate danger when working with electricity. DANGER! This warning refers to the immediate danger of burns caused by heat or hot surfaces. DANGER! This warning refers to the immediate danger when using this device in a hazardous atmosphere. DANGER! These warnings must be observed without fail.
2 DEVICE DESCRIPTION OPTISENS PH 9100 2.1 Scope of delivery INFORMATION! Inspect the cartons carefully for damages or signs of rough handling. Report damage to the carrier and to the local office of the manufacturer. INFORMATION! Do a check of the packing list to make sure that you have all the elements given in the order. INFORMATION! Look at the device nameplate to ensure that the device is delivered according to your order. Check for the correct supply voltage printed on the nameplate.
DEVICE DESCRIPTION 2 OPTISENS PH 9100 2.2 Device description 2.2.1 pH sensor Figure 2-2: Sensor types 1 2 3 4 5 6 7 8 9 Cable connector DIN coax O-ring Refill hose connecting Mounting Kit PG 13.5 (optional) Washer O-ring Glass Glass sleeve diaphragm pH sensitive glass 09/2012 - 4002314801 - MA OPTISENS PH 9100 R02 en www.krohne.
2 DEVICE DESCRIPTION OPTISENS PH 9100 The OPTISENS PH 9100 is manufactured using a pH sensitive special glass which can be used in almost all standard water applications due to its wide measuring range.
INSTALLATION 3 OPTISENS PH 9100 3.1 Notes on installation INFORMATION! Inspect the cartons carefully for damages or signs of rough handling. Report damage to the carrier and to the local office of the manufacturer. INFORMATION! Do a check of the packing list to make sure that you have all the elements given in the order. INFORMATION! Look at the device nameplate to ensure that the device is delivered according to your order. Check for the correct supply voltage printed on the nameplate. 3.
3 INSTALLATION OPTISENS PH 9100 Figure 3-1: pH sensor in its original packaging 1 2 3 4 5 6 Plastic tube filled with 3 molar KCl solution pH sensor O-ring Washer Protective cap over electrical connector Sealing cap without hole to seal plastic tube 2 when sensor is in use Storing the sensor in the provided plastic tube • • • • Screw the sealing cap off the plastic tube. Keep it in the original packaging. If there is not enough KCl solution in the plastic tube, fill it up with 3 molar KCl solution.
INSTALLATION 3 OPTISENS PH 9100 3.4 Pre-installation requirements CAUTION! • Never touch or scratch the pH sensitive glass tip of the sensor. • Make sure that the glass tip is clean and dust-free. If necessary, clean the tip as described on page 37 Figure 3-2: Handling the sensor Unpacking the sensor • • • • Loosen the storage cap which is screwed or/and pushed on to the plastic tube 1. Gently pull the sensor out of the plastic tube 2. Lay the sensor on a soft mat/tissue 3.
3 INSTALLATION OPTISENS PH 9100 3.5.1 Connecting the sensor cable to the signal converter DANGER! All work on the electrical connections may only be carried out with the power disconnected. Take note of the voltage data on the nameplate! INFORMATION! Look at the device nameplate to ensure that the device is delivered according to your order. Check for the correct supply voltage printed on the nameplate.
INSTALLATION 3 OPTISENS PH 9100 Figure 3-4: Connecting the sensor cable The following instructions describe the connection of the different sensor cables. Connecting the sensor cable to the signal converter • Thread the sensor cable through the outer right cable gland 1. • Push the coax shield 4 into terminal N 2 and the coax core into terminal O 3. • To remove a cable, press down the white clip 5 on the corresponding terminal and pull the cable out 6. 3.5.
3 INSTALLATION OPTISENS PH 9100 3.5.3 Connecting the cable to the sensor CAUTION! Moisture inside the sensor connector must be avoided! Moisture will shortcut the mV signal between the electrodes and deliver erratic readings! If moisture has entered the connector dry it with air (e.g. hair blower). Figure 3-6: Connecting the cable to the sensor Connecting the cable to the sensor • • • • Unscrew the protective cap from the sensor connector and keep it for future use 1.
INSTALLATION 3 OPTISENS PH 9100 3.7 Installing the sensor 3.7.1 General installation instructions The sensor tip must always have full contact with the measuring medium. The mounting position of the sensor should not deviate more than 75° from vertical position (sensor tip pointing downwards). Doing otherwise might cause internal air bubbles to float into the sensor glass tip. This would interrupt the electrical contact between the inner buffer solution and the glass surface.
3 INSTALLATION OPTISENS PH 9100 3.7.2 Mounting to a flow-through holder WARNING! Ensure that the pipe is without pressure before installing or removing a sensor! INFORMATION! The flow-through holder is an optional accessory and not part of the standard scope of delivery. It has to be installed horizontally in pump or sample lines or directly in the process.
INSTALLATION 3 OPTISENS PH 9100 3.8 Installing an external temperature sensor Since the slope of the pH sensor is temperature-dependent, a temperature compensation makes sense if the temperature of your measuring medium varies. If the pH sensor does not have an integrated Pt100/1000 temperature sensor, you should use an external temperature sensor. There are various different possibilities of adding an external temperature sensor to your pH measurement installation.
3 INSTALLATION OPTISENS PH 9100 3.9 Examples of a typical measuring point The following examples each show the signal converter, a sensor with or without integrated temperature measurement, and the flow-through or immersion holder.
OPERATION 4 OPTISENS PH 9100 4.1 Menu mode structure INFORMATION! The following table just presents an overview. When programming the device, always consult the function tables additionally as they contain further information! Only the sensor relevant menus are shown in the following tables. For detailed information about the general setting refer to the MAC 100 signal converter manual. Measuring Main menu mode Submenu 3 or 4 pages, scrolling with ↓ or ↑ > A9.1 temp.comp. ^ > 2.
4 OPERATION OPTISENS PH 9100 Measuring Main menu mode Submenu 3 or 4 pages, scrolling with ↓ or ↑ > B1 sim.process inp.A ^ > 2.5 s ^ B test Parameter > B1.1 temperature ^ B1.5 ORP Only if switched to ORP! (for dual channel version; refer to pH/ORP sensor documentation for further information) > For further ^ information see function tables. B1.7 pH (for dual channel version; refer to pH/ORP sensor documentation for further information) B2 sim.process inp.B B 2.1 temperature B2.
OPERATION 4 OPTISENS PH 9100 Measuring Main menu mode Submenu 3 or 4 pages, scrolling with ↓ or ↑ > C1 process input A ^ > 2.5 s ^ C setup Parameter > C1.1 parameter (pH/ORP) ^ C1.7 inner buffer (only pH) C1.8 zero point > For further ^ information see function tables. C1.9 slope C1.10 calibration buffers C1.14 time constant C1.15 temperature C1.16 ORP cal. C1.17 pH cal. C2 process input B (for dual channel version; refer to pH/ORP sensor manual for further information) C2.
4 OPERATION OPTISENS PH 9100 4.2.2 Menu B, test INFORMATION! Note that the appearance of some sub-menus depends on the hardware setting and the used sensor(s). Also only the sensor relevant menus and sub-menus are shown here in detail. For all other menu functions refer to the MAC 100 signal converter manual. The procedure to start the simulation process is the same for all functions: • Choose the function with the help of ↓ or ↑ and press ^.
OPERATION 4 OPTISENS PH 9100 4.2.3 Menu C, setup INFORMATION! The signal converter has a dual process input, A and B. Each process input has an own submenu in this main menu. Process input A is always present, i.e. there is always a board in the interface "Pos.A" in the connection area. The interface of process input B only has a board with the dual channel signal converter. Be aware that the definition which kind of measurement a process input can do is defined when ordering the device.
4 OPERATION OPTISENS PH 9100 Level Designation / function Settings / descriptions C1.15.5 C2.15.5 temp. comp. Menu for activating the temperature compensation parameters for the measurement. Options: • Linear: linear temperature compensation. • Off: temperature compensation is disabled. C1.16 C2.16 ORP cal. Menu item for calibrating the ORP sensor. C1.16.1 C2.16.1 prepare calibration View actual ORP value. C1.16.2 C2.16.2 ref. value ORP Enter the reference value of the probe in mV. C1.16.
OPERATION 4 OPTISENS PH 9100 4.3 Calibration 4.3.1 Temperature compensation There are three basic options for temperature compensation: • automatic: the signal converter will automatically compensate temperature influences using the information of a Pt100 or Pt1000 temperature sensor. • manual: the signal converter will compensate temperature influences using a manually entered value; this option only makes sense if the temperature of the measured medium is quite constant.
4 OPERATION OPTISENS PH 9100 After starting-up the signal converter, the measuring screen appears. This is the standard screen which is displayed automatically in the normal operating mode. If you are in this mode and you want to adjust the temperature compensation, you have to perform the following steps: Step 1: activating the temperature compensation for measurement • Press > for more than 2.5 seconds, then release the button. You are on the main menu level.
OPERATION 4 OPTISENS PH 9100 Step 2: Configure /adjust the temperature sensor Step 2a: probe Pt100/1000 Read the currently measured temperature of the Pt100/1000 temperature sensor from the measurement screen and write it down. Measure the temperature with a reference thermometer and check if it deviates from the temperature measured by the Pt100/1000. • Press > for more than 2.5 seconds, then release the button. You are on the main menu level.
4 OPERATION OPTISENS PH 9100 Step 2b: probe manual Measure the temperature of the measuring medium. • Press > for more than 2.5 seconds, then release the button. You are on the main menu level. In the upper line of the display "A" appears, beneath the main menu setup is highlighted. • Press or until the main menu setup is highlighted. MAIN MENU A quick setup B test > C setup D service • Press > to enter the chosen menu. You are on the first submenu level.
OPERATION 4 OPTISENS PH 9100 4.3.2 Calibrating pH measurement A pH calibration is necessary in regular intervals or when installing a new pH sensor. In an intact sensor, the optimal slope is 59 mV for each pH unit and the optimal zero point is 0 mV at pH 7. The slope should at least have a value between 50...65 mV per pH unit. Re-calibrate the sensor if the slope does not approximate those limits. The pH sensor ages, the slope gets flatter and the zero error increases.
4 OPERATION OPTISENS PH 9100 Step 1: activating the manual hold function • Press > for more than 2.5 seconds, then release the button. You are on the main menu level. In the upper line of the display "A" appears, beneath the main menu quick setup is highlighted. • Press or until the main menu quick setup is highlighted. MAIN MENU > A quick setup B test C setup D service • Press > to enter the chosen menu. You are on the first submenu level.
OPERATION 4 OPTISENS PH 9100 Step 3a: accessing the calibration menu via the main menu setup • Press > for more than 2.5 seconds, then release the button. You are on the main menu level. In the upper line of the display "A" appears, beneath the main menu quick setup is highlighted. • Press or until the main menu setup is highlighted. MAIN MENU A quick setup B test > C setup D service • Press > to enter the chosen menu. You are on the first submenu level.
4 OPERATION OPTISENS PH 9100 Figure 4-1: Calibration procedure Step 4: calibration procedure • After choosing the submenu pH cal. (step 3a) or pH cal. A or B (step 3b) in the previous steps, continue by pressing >. i The signal converter demands to choose the kind of temperature compensation for the calibration. You have the options "off", "automatic" and "manual" (for detailed information refer to Temperature compensation on page 27).
OPERATION 4 OPTISENS PH 9100 • Press ^ to confirm. i The slope of the sensor is displayed (should be near 59 mV in an intact sensor). • Press ^ to confirm. i The message store cal. value? is displayed on the screen. The converter asks if the new calibration values should be stored. • Choose yes to store the calibration values. Choose no to discard the results. • Press ^ to confirm. i Prior returning to the measuring display, you are asked if the configuration should be stored.
4 OPERATION OPTISENS PH 9100 4.3.3 Calibration log INFORMATION! In order to show the history of the calibrations, the signal converter has a calibration logbook function. Up to 64 entries of the calibration history are stored including date and time. Accessing the calibtration log • Press > for more than 2.5 seconds, then release the button. You are on the main menu level. In the upper line of the display "A" appears, beneath the main menu quick setup is highlighted.
SERVICE 5 OPTISENS PH 9100 5.1 Maintenance 5.1.1 Cleaning • Slight dirt residues or dust: Rinse the sensor tip with tap water and clean it with a soft tissue. • Oily and greasy coatings: Remove with a warm soap solution and rinse with water. • Hardness deposits or metal hydroxide deposits: Remove with 10% citric acid or hypochloric acid and rinse with water. 5.1.2 Aging and re-calibration During operation, but already during storage, pH senors age due to poisoning effects of the inner buffer system.
5 SERVICE OPTISENS PH 9100 INFORMATION! The life time of a pH sensor can lie anywhere between 6 weeks and 2 years. The life time expectation depends heavily on the application. The right choice of the sensor type is very important. 5.2 Spare parts availability The manufacturer adheres to the basic principle that functionally adequate spare parts for each device or each important accessory part will be kept available for a period of 3 years after delivery of the last production run for the device.
SERVICE 5 OPTISENS PH 9100 5.4.2 Form (for copying) to accompany a returned device Company: Address: Department: Name: Tel. no.: Fax no.: Manufacturer's order no. or serial no.: The device has been operated with the following medium: This medium is: water-hazardous toxic caustic flammable We checked that all cavities in the device are free from such substances. We have flushed out and neutralized all cavities in the device.
6 TECHNICAL DATA OPTISENS PH 9100 6.1 Measuring principle 6.1.
TECHNICAL DATA 6 OPTISENS PH 9100 The voltage change of a pH sensor at 25°C / 77°F is around 59 mV for each pH unit. This is also called the slope of the pH sensor. The slope is temperature dependent and decreases over life time of the sensor. Figure 6-2: Optimal slope at 25°C / 77°F To compensate for the temperature dependency of the pH measurement, the temperature of the medium can be measured and automatically compensated in the signal converter.
6 TECHNICAL DATA OPTISENS PH 9100 6.2 Technical data INFORMATION! • The following data is provided for general applications. If you require data that is more relevant to your specific application, please contact us or your local sales office. • Additional information (certificates, special tools, software,...) and complete product documentation can be downloaded free of charge from the website (Download Center).
TECHNICAL DATA 6 OPTISENS PH 9100 Operating conditions Temperature range -5…+100°C / +23…+212°F Max. operating pressure 1 bar / 14.5 psi Minimum conductivity > 20 µS/cm Installation conditions Process connection Mounting kit PG 13.5 (optional) Immersion holder SENSOFIT IMM 1000 with mounting kit PG 13.5 (optional) Flow- through holder SENSOFIT FLOW 1000 with mounting kit PG 13.5 (optional) insertion screw-in adapter SENSOFIT INS 1000 with mounting kit PG 13.
6 TECHNICAL DATA OPTISENS PH 9100 6.3 Dimensions Figure 6-4: Dimension of the pH sensor Dimensions [mm] Dimensions [inch] a 31 1,22 b 160 6,3 c 120 4,72 d Ø 12 Ø 0,47 e 22 0,87 f Ø8 Ø 0,31 Figure 6-5: Dimensions SENSOFIT FLOW 1000 Dimensions [mm] 44 Dimensions [inch] amaxi 165 6,5 b 142,5 5,61 c 178,5 7,03 d Ø 75 Ø 2,95 e Ø 21 Ø 0,83 e1 G1 G1 f 19,1 0,75 g 22 0,87 www.krohne.
APPENDIX 7 OPTISENS PH 9100 7.1 pH as a function of mV The pH-value is the negative decadative logarithm of the hydrogen ion concentration, and it is directly related to the proportion of hydrogen ions H+ to hydroxide ions OH- in the media. The pHsensor measures excess or deficit of the hydrogen ions and gives a proportional millivolt signal as output. The signal is 59.16 mV per 1 pH at 25°C / 77°F.
7 APPENDIX OPTISENS PH 9100 7.2 pH temperature dependency The output from a pH-sensor varies with the temperature in a predictable way. The size of the variation depends on both the temperature and the pH being measured. °C °F pH pH pH pH pH pH pH pH pH pH pH pH 5 41 2.30 3.24 4.18 5.12 6.06 7.00 8.06 9.12 10.18 11.24 12.30 13.36 15 59 2.15 3.12 4.09 5.06 6.03 7.00 8.03 9.06 10.09 11.12 12.15 13.18 25 77 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.
OPTISENS PH 9100 09/2012 - 4002314801 - MA OPTISENS PH 9100 R02 en 8 www.krohne.
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