TPS miniCHEM-pH Скачать руководство пользователя страница 13 | Manualshive

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TPS miniCHEM-pH Скачать руководство пользователя страница 13

Page 13

3.5.3 Adjusting the Hysteresis

The hysteresis is the pH range over which the alarm/control output remains
switched on, once the trip point has been exceeded.

For example, if the limit is set to pH7.00, as a “too low” trip point, with a
hysteresis of ±0.10pH, the alarm/control output is switched ON when the reading
goes to pH6.90 (i.e. 7.00 - 0.10). The output is not switched OFF until the reading
goes back up to pH7.10 (i.e. 7.00 + 0.10).

The hysteresis stops the relay “chattering” around the set point, by providing a
buffer between the points at which the output is switched ON and OFF. This
feature can significantly increase the life of pumps and solenoid valves.

The factory-set hysteresis is approximately ±0.10 pH, as in the example above.
The hysteresis can be increased to as high as ±0.40 pH with the

HYSTERESIS

trimmer in the terminal area. Turning the

HYSTERESIS

clockwise increases the

hysteresis and turning it anti-clockwise decreases the hysteresis.

TPS DOES NOT recommend that this setting be altered, unless it is absolutely
necessary.

The

HYSTERESIS

trimmer should only be adjusted a little at time. The process

being controlled should then be closely monitored over a time to ensure that the
desired control is being achieved.

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Содержание miniCHEM-pH

Страница 1: ...y listed Sub sections have also been included to enable you to find the information you need at a glance 2 Introduction The introduction has a diagram and explanation of the display and controls of the miniCHEM pH It also contains a full listing of all of the items that you should have received with the unit Please take the time to read this section as it explains some of items that are mentioned ...

Страница 2: ...ty Ltd ABN 30 009 773 371 4 Jamberoo Street Springwood Brisbane Australia 4127 Phone 07 32 900 400 International 61 7 32 900 400 Fax 07 3808 4871 International 61 7 3808 4871 Email tps tps com au Web www tps com au ...

Страница 3: ... Factory Config Jumpers 15 4 Calibration 16 4 1 Calibration Procedure 16 4 2 Calibration Notes 17 5 Process Monitoring 18 6 Automatic Dosing 18 7 Manual Dosing 18 8 Fuse Replacement 18 9 Troubleshooting 19 9 1 Instrument Function Troubleshooting 19 9 2 pH Troubleshooting 20 10 Warranty 21 11 Appendices 23 11 1 Checking the reference junction of a pH electrode 23 11 2 Determining if an instrument o...

Страница 4: ...Page 4 1 Introduction 1 1 miniCHEM pH Illustration ...

Страница 5: ...0 buffer See section 4 1 Span Calibrate Control Adjust this control to calibrate the miniCHEM pH in a buffer several pH away from pH7 e g pH4 00 or pH9 23 See section 4 1 Function Switch The Function Switch is used to select the mode of operation See section 2 Display Window The miniCHEM pH has a large easy to read LCD display The units of measurement are clearly shown in the window beneath the di...

Страница 6: ...M pH Dip mounted pH and ATC Sensors and submersible assembly 1 Submersible Non flow pH Sensor 5m 111228 2 Intermediate Junction pH Sensor 5m 111227 3 Industrial 12K ATC Sensor 5m 111275 4 Submersible protective housing for pH ATC 111303 Screw in pH and ATC Sensors and adaptor for 40mm PVC pipe 1 Screw in Non flow pH Sensor 5m 111244 2 Screw in Industrial 12K ATC Sensor 5m 111265 3 BSP thread adapt...

Страница 7: ... Mode Rejection 120 dB Enclosure Polycarbonate waterproof to IP65 Display 12 7 mm LCD optional remote 4 20mA loop powered display available Analogue Outputs 4 to 20mA 500 Ohms max loop resistance 0 to 1 V DC min load 1000 Ω 0 to 10 V DC optional min load 1000 Ω Control Output optional Clean contact changeover relay rated to 2A at 240V AC Isolation Galvanic isolation of sensor input Power 240V AC 5...

Страница 8: ...itch to STANDBY to inhibit the Alarm LED and optional output relay action Select this mode for calibration or when automatic dosing is not required 3 AUTO Switch to AUTO to enable the Alarm LED and optional relay output These will be activated when the pH is outside the limit value See section 3 5 4 MANUAL Switch to MANUAL to manually dose acid or base when the optional relay output is fitted The ...

Страница 9: ...n and Set up 3 1 Connection and Configuration Diagram The diagram below is provided as a reference for the terminal connections configuration jumpers and user adjustable trimmers that are discussed throughout this section ...

Страница 10: ...close as possible to the injection point This will cause the sensors to detect the added chemicals immediately and shut the addition off until mixing has taken place For in line mounting it is important that chemicals are injected upstream Additionally the line must be run through a mixing chamber such as a large drum to ensure that the injected chemical has mixed in properly by the time the solut...

Страница 11: ... Normally Closed contact of optional relay output Customer defined 11 Common contact of optional relay output Customer defined 12 Normally Open contact of optional relay output Customer defined 13 240V AC Active input Brown standard colour 14 Duplicate 240V AC Active contact See section 11 3 Brown standard colour 15 240V AC Earth input Green standard colour 16 Duplicate 240V AC Earth contact See s...

Страница 12: ...yed Note that the Alarm LED and optional output relay are now disabled The 4 20mA or 0 1V outputs are still active and proportional to displayed value 2 Adjust the LIMIT control until the display reads the desired trip point value 3 5 2 Setting the alarm control direction The control limit can be set as a too high or too low trip point using the Lo Hi Control jumpers in the terminal area The miniC...

Страница 13: ...fer between the points at which the output is switched ON and OFF This feature can significantly increase the life of pumps and solenoid valves The factory set hysteresis is approximately 0 10 pH as in the example above The hysteresis can be increased to as high as 0 40 pH with the HYSTERESIS trimmer in the terminal area Turning the HYSTERESIS clockwise increases the hysteresis and turning it anti...

Страница 14: ... for 4 to 20 mA output are C V C V C The jumper settings for 0 to 1V DC output are C V C V C Note that the spare jumper has been fitted to a spare Current Voltage Output jumper pin This is a safe place to keep it in case the miniCHEM pH needs to be reset to current output in the future 0 to 10V DC output is available as a factory fitted option The jumper settings are the same as detailed above but...

Страница 15: ...LIMIT control until the display reads 14 00 6 Adjust the SPAN 20mA trimmer in the terminal area until the Digital Milliamp Meter reads 20 mA In the event that the LIMIT control does not have sufficient adjustment to reach 0 00 or 14 00 calculate the expected output level and use this for calibration Remember that the difference between 0 and 14 pH is to be made 16mA 3 8 CMRR Control The Common Mod...

Страница 16: ...the pH sensor from buffer to buffer 4 Remove the wetting cap from the pH sensor 5 Rinse the pH and ATC sensors in distilled water and blot them dry Asymmetry Zero Calibration 6 Place both sensors into a small sample of pH6 88 or pH7 00 buffer so that the bulb and reference junction are both covered see diagram below DO NOT place the electrodes directly into the buffer bottle Discard the used buffe...

Страница 17: ...or pH10 00 buffer for span calibration 4 When the reading has stabilised adjust the SPAN control until the display shows the value of the buffer The pH4 00 buffer supplied by TPS lists the pH value of the buffer at various temperatures 5 Rinse the pH and ATC sensors in distilled water and blot them dry 6 The miniCHEM pH is now calibrated and ready for pH measurements 4 2 Calibration Notes 1 An Asy...

Страница 18: ... NOTE The output will be ON continuously while the function switch is set to MANUAL It will not be switched OFF again until the switch is set back to one of the other modes 8 Fuse Replacement If the current drain from any device connected to the output relay exceeds 1Amp the output protection fuse will blow To replace the fuse 1 SWITCH THE miniCHEM pH OFF 2 Pull out the black fuse carrier 3 Replac...

Страница 19: ...section 3 5 2 Return unit to factory to have relay output fitted part no 130342 Check and adjust the HYSTERESIS trimmer see section 3 5 3 If in doubt set this to minimum level Check and replace fuse if necessary see section 8 Return to TPS for repair Incorrect analogue output signal 1 Current Voltage Output jumpers incorrectly set for required output 2 4 20mA loop resistance too high 3 Load on 0 1...

Страница 20: ...ked 3 Glass bulb not clean 4 Bubble in glass bulb 5 Reference junction not immersed 6 KCl crystals around reference junction inside the electrolyte chamber Connect the green wire from the ATC or solution guard rod if no ATC sensor is fitted to terminal 3 see section 3 4 Clean reference junction as per instructions supplied with the electrode Clean glass bulb as per instructions supplied with the e...

Страница 21: ...he registration section returned to TPS Pty Ltd within 7 days No claims will be recognised without the original guarantee card or other proof of purchase This warranty becomes invalid if modifications or repairs are attempted by unauthorised persons or the serial number is missing PROCEDURE FOR SERVICE If you feel that this equipment is in need of repair please re read the manual Sometimes instrum...

Страница 22: ...aired and returned to you by air express where possible For out of warranty units a repair cost will be calculated from parts and labor costs If payment is not received for the additional charges within 30 days or if you decline to have the equipment repaired the complete unit will be returned to you freight paid not repaired For full account customers the repair charges will be debited to your ac...

Страница 23: ... required 11 2 Determining if an instrument or electrode is faulty The following test can be performed to help determine if the miniCHEM pH or the pH electrode is faulty 1 Disconnect the pH electrode 2 Connect a short piece of wire or a paper clip etc between terminals 5 and 6 3 The ZERO control should have sufficient range to obtain a reading of exactly 7 00 on the display 4 If the miniCHEM pH is...

Страница 24: ...sed contact of optional relay output Customer defined 11 Common contact of optional relay output Customer defined 12 Normally Open contact of optional relay output Customer defined 13 No connection for 12V DC version 14 Negative of 12V DC Input Customer defined 15 No connection for 12V DC version 16 No connection for 12V DC version 17 No connection for 12V DC version 18 Positive of 12V DC Input Cu...

Страница 25: ...Page 25 11 4 Relay Output Wiring Examples for mains powered units The diagrams below provide some examples of wiring the optional relay output for standard mains powered miniCHEM pH units ...

Страница 26: ...Page 26 11 5 Relay Output Wiring Examples for 12V DC powered units The diagrams below provide some examples of wiring the optional relay output for miniCHEM pH units with the 12V DC power option ...

Страница 27: ...Page 27 11 6 Drilling Template The template below is for the three mounting positions for the miniCHEM enclosure This template is actual size and can be photocopied or removed as required ...

Страница 28: ...Page 28 ...

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