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YOKOGAWA PH200, Инструкция по эксплуатации

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YOKOGAWA PH200 Скачать руководство пользователя страница 31

IM 12B6C2-E-H

1. What is HOLD?

Hold is a function which freezes the output
signal temporarily, it is normally used during
maintenance when the sensor is removed
from the measured solution to prevent
unwanted controller reaction. 

The HOLD function must be commissioned
from the programming menu before it can
be switched on or off. See setup the hold
function for more details (§4-3). 

2. How does it work?

From this level the HOLD function can only
be switched ON or OFF. 

HOLD is switched on when you press YES
and HOLD blinks. When you press NO
HOLD is switched OFF. 

A flag is kept in memory and an indication is
made in the upper left corner of the display
field. 

The HOLD function only influences the out-
put signal, no other functions are influenced. 

The operator is prompted to switch HOLD
on or off after having performed a mainte-
nance function.

3. Example

During the transfer of cleaning liquid into a
batch reactor with a pH-control system
dosing acid or alkali, the HOLD function is
switched ON to prevent the controlling in-
struments from running wild. 

After cleaning has ceased and the new
batch has been started HOLD is switched
OFF again and pH control resumes. 

27

5-5. Hold output function

Содержание PH200

Страница 1: ...IM 12B6C2 E H 6th edition Instruction Manual Model PH200 2 wire pH transmitter YOKOGAWA ...

Страница 2: ...PROMPT FLAGS SELECTION KEYS YES Accept setting NO Change to new setting ADJUSTMENT KEYS Choose digit for adjustment Adjust digit to decrease pass through zero ENT Enter new value NOTE The first digit changes from 1 1 to blank SELECT MODE MEASURE MAINTENANCE Can be used to escape program at any time MANUAL TEMPERATURE COMPENSATION FLAG FAIL FLAG MENU POINTER FLAGS MENU FOR MAINTE NANCE FUNCTIONS se...

Страница 3: ...3 1 General precautions 8 3 3 2 Additional precautions for installations in hazardous areas 8 3 3 3 Connection of the power supply 8 3 3 4 Switching the instrument on 8 4 COMMISSIONING 11 4 1 Operations overview 11 4 2 Output range adjustment OUTPUT 12 4 3 Set up the HOLD function SET HOLD 14 4 4 Sensor selection and diagnostics 16 4 4 1 Selection of measurement and reference electrode 16 4 4 2 Se...

Страница 4: ... tables 35 7 11 Temperature adjustment 36 7 12 Manual adjustment of ITP slope and asymmetry potential 36 7 13 Passwordprotection by three digit code 37 7 14 Restore default settings 37 8 CLASSIFICATION 38 8 1 Cenelec 38 8 2 FM 39 9 CHANGE FROM PH TO ORP MEASUREMENT 40 9 1 How to change from pH measurement to ORP measurement 40 9 2 Commissioning the transmitter 40 9 3 Maintenance of the transmitter...

Страница 5: ... diffe rent purposes To be part of a total process control sys tem To indicate dangerous limits of a process To monitor product quality 1 2 Required components for pH measurement 1 A pH electrode and a reference electrode or a combined pH reference electrode 2 A temperature sensor Pt100 according to IEC 751 or DIN or Pt1000 3 A fitting for the above electrodes with accessories 4 Signal cables with...

Страница 6: ...age temperature 30 to 70 C Relative humidity 10 to 90 Weather protection Rain and dust tight IP65 NEMA 4X G Housing Material Cast aluminium with chemical resi stant coating Window Flexible poly carbonate Colours Moss green off white Cable glands Polyamide Cable entries Two h glands Hose connection optional Earth connection For external ground H Mounting possibilities Surface mounting Two M6 bolts ...

Страница 7: ...cessible through the flexible win dow cover The keys are scanned conti nuously and actions are taken immediately An extensive system of checking va lues and parameters is implemented in the software The 2 wire design gives maximum flexibility of operation with other industrial instruments and controlling systems An intrinsically safe version is available for hazardous areas The rugged housing is d...

Страница 8: ... is not mounted in direct sunlight and severe weather conditions maintenance activities are possible no corrosive atmospheres The ambient temperature and humidity should be within the limits of the specifica tions 3 1 2 Mounting methods The EXA PH200 transmitter has universal mounting possibilities panel mounting using selftapping screws surface mounting on a plate by bolts from the back wall moun...

Страница 9: ...IM 12B6C2 E H 5 Option M Universal wall pipe mounting kit Pipe mounting vertical Pipe mounting horizontal 2 Pipe 2 Pipe Wall mounting 115 4 53 70 2 75 56 2 2 200 7 87 2x ø6 6 0 26 4x ø10 0 4 77 3 03 ...

Страница 10: ...d side of the transmitter to protective earth The intrinsic safe version of the EXA PH200 instrument can be erected in Zone 1 The sensors can be installed in Zone 0 or Zone 1 if a safety barrier according to the limits given in the system certificate is used 3 2 3 Liquid earth In all circumstances the sensor side of the measuring loop must be grounded to the measuring liquid The EXA PH200 uses adv...

Страница 11: ... 17 15 16 G 11 12 14 13 17 15 16 T1 T2 SE RE GE S Rd Red Bl Blue Wt White Single electrodes Temperature Combined Liquid earth Temperature Reference pH Pt 100 AgCl glass Pt 1000 other other EXA compact and retractable electrodes pH Combined electrode Combined electrodes Liquid earth Connect the numbered cable leads to the corresponding terminals ...

Страница 12: ... is mounted on a grounded surface e g a metal frame fixed in the soil the shield of the 2 wire cable may NOT be connected to ground at the distributor If the transmitter is mounted on a non conducting surface e g a brick wall it is recommended to ground the shield of the 2 wire cable at the distributor end 4 Installation for EEx ia sensors in Zone 0 or 1 Generally the distributor with input out pu...

Страница 13: ...ign pH transmitter EXA PH200G Sensor Distributor Output Supply NOTE The outside earth terminal should be connected to site ground by a large area conductor e g a flat earth strip for best protection against interference 1200 1000 800 600 400 200 0 1718 20 24 40 Ohm 550 Supply voltage V Load resistance Ω G ...

Страница 14: ...x ib Certified distributor with input output isolation Electronic current limiting barrier Vmax 31 5 V lmax 35 mA Pmax 1 1 W Zenerbarrier with resistor Vmax 28 V lmax 93 3 mA Pmax 0 66 W Shunt zener barrier or supply unit or isolated repeater Vmax 22 V Imax 85 mA Sensor Distributor Output Supply Sensor Output Supply Protective earth Protective earth Protective earth Hazardous area Safe area Zone 0...

Страница 15: ...s through MAN CAL Calibration in process 5 2 closed cover DISPLAY Show or fix additional values 5 3 TEMP Select automatic or manual temperature compensation 5 4 HOLD Switch HOLD function on off 5 5 COMMISSIONING OUTPUT Adjusting the output function 4 2 Operation by key when SET HOLD Activating the HOLD function 4 3 cover is removed SERVICE SERVICE Finetuning the performance 7 Operation by coded en...

Страница 16: ...just value for high span Select digit to adjust Adjust digit Confirm adjusted value Return to measurement 4 2 Output range adjustment YES ENT ENT MODE NO IM 12B6C2 E H 12 ESCAPE TO MEASURE can be used at any stage to abort operation WARNING If the HOLD function is activated the instrument returns with the question HOLD flashing answer YES or NO or MODE again to return to measurement x MODE OUTPUT ...

Страница 17: ...o 20 5 mA giving a safety area of 2 5 at both ends 2 Values below 3 9 or above 20 5 mA are not related to input values and signal a malfunction 2 How to adjust EXAMPLE The EXA PH200 has to be programmed for a range of 2 12 pH Adjust 4 mA to 2 00 pH Adjust 20 mA to 12 00 pH The instrument will now correct its calcula tion for the output signal accordingly 3 Calculation example The current to be set...

Страница 18: ... last value Select HOLD fixed or last Change selection Confirm selection 3 Select value to hold Display shows current setting Adjust fixed value Select digit to adjust Adjust value of digit Confirm setting Return to measurement 14 OUTPUT SET HOLD SERVICE YES NO YES NO MODE OUTPUT SET HOLD SERVICE YES NO MODE ENT YES ENT NO YES NO YES NO x ESCAPE TO MEASURE can be used at any stage to abort operati...

Страница 19: ...menu before it can be used The EXA PH200 will keep the output frozen during the following events a Access to the commissioning menu b Access to either of the calibration modes c Switching it from the maintenance menu HOLD is signalled in the display by a special flag The operator is prompted to switch HOLD on or off before returning to nor mal mea surement 3 Example In a neutralization set up with...

Страница 20: ... electrode cable length is used To correct for cable resistance it is possible to calibrate the sensor from the service level zie 7 11 The highest accuracy is obtained by using a Pt1000 element with the EXA PH200 trans mitter This element gives a ten fold increase in resistance dependance over a Pt100 sen sor Setting the instrument for Pt1000 is from the service level at 7 4 4 4 3 Off line calibra...

Страница 21: ...by an error E5 A short cir cuit is signalled by an error E4 The impe dance of the reference electrode is meas ured RZ The actual value in kilo Ohm can be called up from the display routine in the maintenance menu When pH is measured in high purity water it is necessary to adjust the reference impedance for the low con ductivity of the solution In general a high impedance value can be related to a ...

Страница 22: ...M 12B6C2 E H 18 MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO pH MODE MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE ESCAPE TO MEASURE can be used at any stage to abort operation WARNING If the HOLD function is activated the instrument returns with the question HOLD flashing answer YES or NO or MODE again to retur...

Страница 23: ...E After second calibration give YES to end session NOTES 1 It is not necessary to have the calibration points within the measuring range of the instrument it is however advisable to do so 2 If no keys are pressed for 10 minutes and the calibration was not finished the instrument will return to measurement with the old calibration values 3 If HOLD was activated the instrument will return to measure...

Страница 24: ...e 3 End calibration CAL END End of calibration End calibration End calibration and return to measurement Continue routine to calibrate second point when using buffer solution repeat step 2 Error E02 or E19 indicate manual calibration is not acceptable 20 MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE M E A S U R E A U T C A L M A N C A L D I S P L AY T E M P H O L D YES NO YES NO MOD...

Страница 25: ... from the process 2 Measure the pH with an off line pH meter which has been previously calibrated with standard buffers and is equiped with an automatic temperature compensation 3 Adjust the value of the in line EXA PH200 transmitter to the measured value 4 Any values outside the normal operating range of the instrument are signal led by Error 19 3 Example The EXA PH200 indicates a process value o...

Страница 26: ...splay Move to desired value for diaplay Confirm selection Return to measurement IM 12B6C2 E H 22 5 3 Selecting a value to display MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MODE NO YES NO YES ESCAPE TO MEASURE can be used at any stage to abort operation WARNIN...

Страница 27: ...rence impendance is shown to indicate the status of the diaphragm of the reference electrode Glass electrode impedance is also checked but not shown The release version is an indication for the servicing of the instrument and cannot be fixed in the display 3 Example To check the value of the output signal 4 20 mA it is displayed on the second line Measuring range 2 12 pH Ouptut signal 4 20 mA Proc...

Страница 28: ...perature coefficient COEFF Temperature coefficient pH change per 10 C When the additional process compensation has been commissioned from the service level this menu will show Adjust solution temperature compensation Select digit to adjust Adjust value Confirm adjusted value only when process compensation was activated in 7 3 24 MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MEASURE ...

Страница 29: ...d to the temperatu re sensor e g Pt1000 resis tor The resistance value of the temperature sen sor is calculated into the temperature value This value is used to calculate the compen sated value for the pH on the display 3 Example Setting the manual temperature compen sation to a fixed setting of 30 C Press NO to change from default automatic compensation to manual compensation The display will sho...

Страница 30: ...d YES NO Switch off HOLD function Switch on HOLD function HOLD in left top of display is switched 26 MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE MEASURE AUT CAL MAN CAL DISPLAY TEMP HOLD YES NO YES NO MODE ESCAPE TO MEASURE can be used at any stage to abort operation WARNING If the HOLD function is activated the instrument returns with the question HOLD flashing answer YES or NO o...

Страница 31: ...ress YES and HOLD blinks When you press NO HOLD is switched OFF A flag is kept in memory and an indication is made in the upper left corner of the display field The HOLD function only influences the out put signal no other functions are influenced The operator is prompted to switch HOLD on or off after having performed a mainte nance function 3 Example During the transfer of cleaning liquid into a...

Страница 32: ...e checked at calibration to see whether they still are reac ting fast enough to changes in pH After calibration the calculated asymmetry potential and slope are checked to see if these are still within the limits specified in the software The slow shift of the asymmetry potential could signal a poisoning of the reference system by the process The decrease of slope indicates a deteriora tion of the...

Страница 33: ...ion E7 Measured temperature too high Process temperature too high Cool process or use sample loop i e above 130 C Wrong temperature sensor used Correct setting 7 4 Temperature sensor damaged Check connections and sensor E8 Measured temperature too low Process temperature too low Warm process or use sample loop i e below 10 C Wrong temperature sensor used Correct setting 7 4 Short circuit in temper...

Страница 34: ... errors are made during the programming process these will be indicated no action will be taken and you can start the program ming again Code Routine Use Chapter 01 Temperature compensation Process comp on off and units Select C or F 7 3 02 Temperature sensors Select sensor type 7 4 03 Sensor checking Choose impedance asymmetry or slope 7 5 04 Display resolution Select 0 1 of 0 01 pH 7 6 05 Signal...

Страница 35: ...ing see individual routines Select digit to adjust Adjust value Confirm adjusted value Return to step 1 or Return to measurement 7 2 Access to service settings OUTPUT SET HOLD SERVICE YES NO MODE ENT OUTPUT SET HOLD SERVICE YES NO MODE ENT OUTPUT SET HOLD SERVICE YES NO YES NO MODE ESCAPE TO MEASURE can be used at any stage to abort operation WARNING If the HOLD function is activated the instrumen...

Страница 36: ...tablish the cor rect factor for your application proceed as follows 1 Take a representative sample of your pro cess composition 2 Measure the pH with automatic tempe rature compensation to Nernst at the minimum actual temperature of the pro cess Call this pHlow 3 Heat the sample to the maximum tempe rature of the process 4 Measure the pH Call this pHhigh 5 Calculate the correct factor a from pHhig...

Страница 37: ...r the reference system of a combined electrode is checked for a high impedance value pointing to a problem in the measurement Also the glass electrode checking is switched on This check only indicates a broken sensor or a wrong glass electrode type When con necting other than normal glass electrodes this checking function can be switched off If the third digit is set to 1 the next step is to adjus...

Страница 38: ...cause it is outside the normal analogue range of 4 to 20 mA If at the receiving end an alarm is set to the value represented by 22 mA it is obvious that the proper action can be taken from the control room too The signal uses the same convention as used in thermo couple indication named as burn out detec tion Default 0 OFF 7 8 Stabilization check ACCESS CODE 06 see 7 2 DISPLAY iT SEC en iPH Adjust...

Страница 39: ...own buffer tables is to program the values of these tables The first thing you will see is BUF ID buffer identity number As a default it is set to the same value as the pH used in the table You can change it to indicate a change you made After pushing ENT you will be prompted with the first buffer value at 0 C By choosing NO you will skip to the next value By choosing YES you can adjust the value ...

Страница 40: ...slope and asymmetry potential ACCESS CODE 12 see 7 2 DISPLAY ITP SLOPE ASPOT Adjustment Set the value of the isothermal point of intersection ITP slope and asymmetry potential Explanation The EXA PH200 can be programmed for pH electrodes that do not have a standard ITP 0 mV point at pH 7 In some applications special pH electrodes are used e g Emamel Antimony etc which have a different construction...

Страница 41: ...sted when entering from the measure mode For the Service level the password entry is requested after pushing the YES key When the Service level protection is acti vated the password cannot be changed by unauthorized persons Default 0 0 0 No password protection 7 14 Restore default settings ACCESS CODE 55 see 7 2 DISPLAY ERASE Adjustment YES Erase all programmed values and replace them by defaults ...

Страница 42: ...t not limited to WU20 PC5 WU20 PC2 WU20 PC10 K1220 EM WU LT2 pH 200 S Vout 14 4 V max Iout 3 6 mA max C ext 1300 nF max L ext 1000 mH max BASEEFA Nr Ex 89C2379 SC 200 S Vout 14 4 V max Iout 72 8 mA max C ext 1300 nF max L ext 8 0 mH max BASEEFA Nr Ex 89C2379 NON HAZARDOUS AREA Certified Barrier with electronic current limitation and the following characteristics Vmax out 31 5 V Imax out 35 mA Pmax...

Страница 43: ...µF max L ext 58 mH max SC 200 S Vout 14 4 V max Iout 129 mA max C ext 1 µF max L ext 2 3 mH max NON HAZARDOUS LOCATION 31 5 Vmax 4 20 mA CONTROL DRAWING FOR EXA 200 INSTRUMENTS HAZARDOUS LOCATION 1 conductivity sensor with SC41 SP34 integral temperature sensor SC49 FP08 such as but not limited to SC41 SP24 SC41 EP14 SC41 EP04 These are all passive sensors to be regarded as simple appara tus i e de...

Страница 44: ...ion with the ENT key 3 The display shows ERASE and now the YES key must be pushed 4 The display shows SERV Pushing the MODE key finishes the procedure to measure ORP 9 2 Commissioning the transmitter As ORP transmitter the PH200 has basically the same functions as explained earlier in this manual While commissioning the microprocessor will skip its relevant settings Instead of pH all values and li...

Страница 45: ...tolerance 20 mV 9 6 Buffer values 11 12 13 14 15 16 17 11 12 13 14 15 16 17 11 12 13 14 15 16 17 Temperature Temperature Reference Liquid earth Metal measure Shield Shield Cable marker T1 Temperature T2 Temperature RE Reference SE Liquid earth GE Measure T1 Temperature T2 Temperature RE Reference SE Liquid earth GE Measureg Red Black Red Blue Blue Blue Red White Green Yellow Black Red ORP PH WIRIN...

Страница 46: ...fter activa ting in access code 03 Explanation Most sensors have theoretical 0 mV at 7 pH Actually these sensors have some off set voltage which is called asymmetry poten tial During calibration EXA corrects this asymmetry potential The value of the asym metry potential is an indicator of the condi tion of the sensor Therefore EXA allows the user to finetune this important diagnostic tool Exceedin...

Страница 47: ...elected the FAIL message flag is flashing The output functions will not go into BURN OUT position If hard alarm function is selected the output goes into BURN OUT signal If program med that way in service code 30 The FAIL flag is shown in the display and the contact functions are no longer active Defaults See Error messages and explanation Chapter 6 2 5 New defaults CODE 03 Adjustment 1 1 1 CODE 0...

Страница 48: ...akia Hungary Poland Croatia Slovenia Jugoslavia Bulgaria Romania Macedonia Bosnia Herzegovina AUSTRIA Yokogawa Austria Ges m b H Franzensbrückenstrasse 26 A 1020 WIEN Tel 43 1 216 50 43 17 Fax 43 1 216 50 43 33 FRANCE Yokogawa Contrôle Bailey S A Vélizy Valley 18 20 Rue Grange Dame Rose 78140 VELIZY VILLACOUBLAY Tel 33 1 39 26 10 00 Fax 33 1 39 26 10 30 GERMANY Yokogawa Deutschland GmbH Berliner S...

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