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IM 12B6B3-E-H

8-2  Troubleshooting

8-1. Diagnostics

8-1-1. Off-line calibration checks

The EXA PH402 transmitter incorporates a diagnostic check of the asymmetry potential after a calibration
has been completed. This is a valid check for both manual and automatic calibration routines.

The actual value can be called up from the DISPLAY routine in the maintenance menu. A large value often
indicates a poisoning or pollution of the reference system used. If the asymmetry potential exceeds pro-
grammable limits, the EXA PH402 generates an error (E2).

The EXA PH402 also performs diagnostics to check for the slope of the pH electrode after automatic cali-
bration is completed. The actual value of the slope can be called up on the DISPLAY routine in the mainte-
nance menu (SL). This value is an indication of the age of the electrode. If the value stays within the limits of
70 to 110 percent of the theoretical value (59.16 mV/pH at 25°C), it is accepted. Otherwise, the unit gener-
ates an error (E3).

Activation or deactivation of the asymmetry diagnostic check and slope check is made from the Service
Codes. See Chapter 5 or Chapter 10 (Appendix).

8-1-2. On-line impedance checks

The EXA PH402 has a sophisticated impedance checking system. The sensors can be checked for their
impedance over a very wide range, which makes the tool equally useful for glass, enamel, reference and
metal (ORP) sensors. The measurement is temperature compensated for the characteristic of the pH glass
sensor.

In order to measure accurately over such a wide range, it is necessary to split the range into two. This is
done by a pair of jumper settings, high range and low range can be set on either input, making the system
extremely flexible.

The following error message table gives a list of problems that are indicated when the high or low imped-
ance limits are exceeded for a sensor. Such things as fouling, breakage and cable faults are readily detect-
ed. The non-immersion of the sensors in the process fluid is also signalled.

Содержание PH402G

Страница 1: ...Instruction Manual Model PH402G pH Converter IM 12B6B3 E H 7th Edition YOKOGAWA...

Страница 2: ......

Страница 3: ...3 6 3 5 1 General precautions 3 6 3 5 2 Analog output signals 3 6 3 6 Wiring the sensor system 3 7 3 6 1 Impedance measurement jumper settings 3 7 3 7 Sensor wiring 3 10 3 7 1 Connection cable 3 11 3...

Страница 4: ...ion procedures 6 2 6 5 1 Automatic calibration 6 2 6 5 2 Automatic calibration with HOLD active 6 3 6 5 3 Manual calibration 2nd parameter calibration 6 4 6 5 4 Sample calibration 6 6 7 MAINTENANCE 7...

Страница 5: ...and service Yokogawa products and parts are guaranteed free from defects in workmanship and material under normal use and service for a period of typically 12 months from the date of shipment from th...

Страница 6: ...IM 12B6B3 E H...

Страница 7: ...uter box and then immedi ately notify the carrier and the relevant Yokogawa sales office Make sure the model number on the textplate affixed to the top of the display board of the instrument agrees wi...

Страница 8: ...sen sors WF10 extension cable can be used up to a maximum of 50 metres 150 feet with a BA10 junction box Except installations with dual high impedance sensors where the maximum cable length is 20 met...

Страница 9: ...ith automatic stability check Manual adjustment to grab sample Slope and Asymmetry Potential setting Zero point can be selected for calibration and display instead of As Pot IEC746 2 G Serial Communic...

Страница 10: ...del and suffix codes E Housing Case Cast aluminium with chemical ly resistant coating Cover flexible polycarbonate window Case color off white and Cover color moss green Cable entry via six 1 2 polyam...

Страница 11: ...t sunlight or severe weather conditions Maintenance procedures are possible avoiding corrosive environments The ambient temperature and humidity of the installation environment must be within the limi...

Страница 12: ...Wall and pipe mounting diagram Figure 3 4 Internal view of EXA wiring compartment OPTION U Universal pipe wall mounting kit pipe mounting vertical wall mounting pipe mounting horizontal 80 3 15 2x 6...

Страница 13: ...back for these cables 6 Replace the screen shield plate over the lower terminals Always replace the screen plate over the power and contact outputs for safety and avoid interference 7 Connect the anal...

Страница 14: ...rating is dependent on the supply to the instrument The 250 VAC fuses should be of the time lag type conforming to IEC127 Fuse ratings are 230 VAC 50 mA 100 VAC 100 mA 115 VAC 100 mA 24 VDC 1 0 A The...

Страница 15: ...to the rear of the housing using a braided wire cable See figure 3 8 3 3 6 Switching on the instrument After all connections are made and checked the power can be switched on from the power supply Mak...

Страница 16: ...he contact S1 is pre programmed for high alarm function The contact S2 is pre programmed for a low alarm function The contact S3 is not activated as an alarm off The contact S4 is pre programmed for F...

Страница 17: ...r Settings Jumper Settings Application Sensor Connections Input 1 Input 2 1 High Impedance Low Impedance Normal pH sensors Glass sensor on Input 1 Reference sensor on Input 2 2 High Impedance High Imp...

Страница 18: ...2 Low impedance Service code 03 1 1 1 Input 1 High impedance Temp comp Check on Service code 04 0 0 1 Input 2 Low impedance Temp comp off Check on Jumper connections for Input 1 High impedance Input 2...

Страница 19: ...igh impedance Service code 03 0 0 1 Input 1 Low impedance Temp comp off Check on Service code 04 1 1 1 Input 2 High impedance Temp comp on Check on Jumper connections for Input 1 Low impedance Input 2...

Страница 20: ...and ORP Yellow for reference electrodes Blue for combined sensors with both measuring and reference elements in the same body Green for temperature sensors The recommended procedure is to color code...

Страница 21: ...14 Liquid earth solution ground connection 15 Input no 1 normally the measuring element 16 Screen shield for input no 1 Figure 3 11a Sensor wiring pH transmitter Green Yellow Red Cable markers 11 Temp...

Страница 22: ...GLASS MEASURE 16 SHIELD 17 SHIELD 11 TEMPERATURE 12 TEMPERATURE 13 REFERENCE 14 SOLUTION GROUND 15 GLASS MEASURE 16 SHIELD 17 SHIELD Separate sensors ORP ref sensor Temp sensors optional for indicati...

Страница 23: ...ately Single cables between approximately 7 mm and 12 mm 0 28 and 0 47 can be sealed properly with these glands 3 7 3 Sensor cable connections using junction box BA10 and extension cable WF10 Where a...

Страница 24: ...3 cm heat shrink 9 cm remove insulation Fig 3 13a 3 Remove loose copper screening and cut off the cotton packing threads as short as possible 4 Strip insulation from the last 3 cm of the brown and the...

Страница 25: ...4 Sensor cable connections with special grommet 3 8 Tag plate mounting When option SCT is specified a stainless steel tagplate is supplied with the designated Tag No stamped or engraved It is mounted...

Страница 26: ...IM 12B6B3 E H...

Страница 27: ...Service For more advanced configuration selections press the button marked then press NO repeatedly until you reach SERVICE Now push the YES button Selecting and entering Service Code numbers in the...

Страница 28: ...o zero then increase to the required number ENT When the required value has been set using the keys press ENT to confirm the data entry Please note that the EXA 402 does not register any change of dat...

Страница 29: ...Code 52 to obtain access to the Maintenance Mode Commissioning Press key The display shows 000 and PASS Enter a 3 digit passcode as set in Service Code 52 to obtain access to the Commissioning Mode Se...

Страница 30: ...OLD NO MODE YES ENT YOKOGAWA MODE TEMPERATURE AUT CAL TEMP MAN pH mV CONTACTS S1 S2 WASH S3 FAIL S4 pH pH pH pH pH pH pH pH NO NO NO NO NO NO NO NO Display Access Impedance of input 1 Impedance of inp...

Страница 31: ...t ORP Impedance Input 1 Impedance Input 2 When these functions are enabled in Service Codes Measuring Mode As Pot Display 2 Back to the Top pH YES NO DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DI...

Страница 32: ...LAY DISPLAY mV DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY NO NO NO NO NO NO NO NO mV YES NO pH Display Current Output 1 Current Output 2 As Pot ORP Impedance Input 1 Impedance Input 2 Software Re...

Страница 33: ...e calibration section 6 Manual calibration See calibration section 6 Sample calibration See calibration section 6 Display setting See operation section 4 Manual impedance check See operation section 5...

Страница 34: ...selected in service code 01 TEMP MAN ENT MEASURE NO MODE YES ENT YOKOGAWA MODE CONTACTS S1 S2 WASH S3 FAIL S4 SETPOINTS RANGE SET HOLD SERVICE WASH NO YES pH AUT CAL YES NO pH TEMP pH MODE NO NO NO N...

Страница 35: ...ted in service code 01 MEASURE MODE mV NO MODE YES ENT YOKOGAWA CONTACTS S1 S2 WASH S3 FAIL S4 SETPOINTS RANGE SET HOLD SERVICE WASH NO YES mV MAN CAL YES NO TEMP mV MODE NO NO NO NO YES NO YES mV NO...

Страница 36: ...YES ENT YOKOGAWA MODE CONTACTS S1 S2 WASH S3 FAIL S4 SETPOINTS RANGE SET HOLD SERVICE WASH pH AUT CAL YES NO pH pH MODE NO NO NO YES NO YES pH pH HOLD YES NO Note The HOLD feature must first be activa...

Страница 37: ...S S1 S2 WASH S3 FAIL S4 SETPOINTS RANGE SET HOLD SERVICE WASH NO YES pH AUT CAL YES NO pH pH MODE NO NO NO NO YES pH NO YES pH YES MODE YES NO Note Wash must first be switched on in commissioning mode...

Страница 38: ...NO YES NO YES pH NO YES pH YES For adjustments follow procedures as in section 5 2 1 For adjustments follow procedures as in section 5 2 1 Setpoint 3 and 4 when enabled in service codes 42 and 43 Set...

Страница 39: ...WASH NO YES pH AUT CAL YES NO pH pH MODE NO NO NO NO YES pH YES NO NO YES pH Return to measuring mode after updating impedance check Note The manual impedance start is available when the sensor impeda...

Страница 40: ...and maybe 0 25 C temperature range Service codes 30 to 39 can be used to choose other output parameters on mA output 2 Choose from ORP temperature rH or PI control Hold The EXA converter has the abili...

Страница 41: ...s ENT pH pH pH pH pH pH pH pH ENT ENT ENT ENT ENT ENT ENT repeated keystrokes YES NO NO NO NO NO NO NO YES NO YES NO YES SETPOINTS RANGE SET HOLD SERVICE MEASURE MAN CAL DISPLAY HOLD MODE TEMPERATURE...

Страница 42: ...setpoint 1 YES NO YES NO YES NO NO NO NO Process Alarms on S 3 and S 4 are only available when enabled in Service Codes 40 49 Analogue control setpoint is only available when enabled in Service Code...

Страница 43: ...NO YES NO NO NO NO NO NO pH YES pH pH pH pH pH pH SETPOINTS RANGE SET HOLD SERVICE MEASURE MAN CAL DISPLAY HOLD MODE TEMPERATURE AUT CAL WASH pH Range YES NO YES ENT YES NO pH See facing page ENT ENT...

Страница 44: ...ns are determined by Service Code 31 ENT ENT Choose Range to adjust then set begin scale 0 and end scale 100 of the mA output signal using the and ENT keys Selection of mA output 0 20 4 20 mA is in Se...

Страница 45: ...S NO YES NO YES NO YES NO NO NO NO NO NO SETPOINTS RANGE SET HOLD SERVICE MEASURE MAN CAL DISPLAY HOLD MODE TEMPERATURE AUT CAL WASH pH YES YES NO YES NO YES NO YES NO YES YES NO HOLD active last meas...

Страница 46: ...Parameter setting IM 12B6B3 E H YES NO ENT HOLD HOLD HOLD HOLD HOLD ENT HOLD ENT ENT ENT HOLD values set return to commissioning menu ENT ENT Set HOLD fixed value for mA2 YES Set HOLD fixed value for...

Страница 47: ...NO NO NO NO NO SETPOINTS RANGE SET HOLD SERVICE MEASURE MAN CAL DISPLAY HOLD MODE TEMPERATURE AUT CAL WASH pH YES YES NOTE The menu item WASH will not appear unless selected in Service Code 42 NO YES...

Страница 48: ...T YES NO YES NO YES NO YES NO YES NO NO NO NO NO NO SETPOINTS RANGE SET HOLD SERVICE MEASURE MAN CAL DISPLAY HOLD MODE TEMPERATURE AUT CAL WASH pH ENT ENT ENT YES ENT ENT Example Service Code 01 Selec...

Страница 49: ...Parameter setting 5 17 IM 12B6B3 E H 5 3 Notes for guidance in the use of service coded settings...

Страница 50: ...t it up to match the sensors used The default settings give a good setup for a conventional system comprising pH glass sensor and a reference electrode either as individual electrodes or as a combinat...

Страница 51: ...H x High impedance limit Press NO to step through choice of units 1 G press YES to select units then use the ENT keys to set the value 04 Z2 CHK Low 0 0 0 1 Low High 1 Temp comp off 0 Off Temp comp o...

Страница 52: ...he calibration is a zero adjustment to allow for the cable resistance which will obviously vary with length The normal method is to immerse the sensor in a vessel with water in it measure the temperat...

Страница 53: ...sensor Pt1000 0 0 Pt1000 Pt100 1 3kBalco 2 5k1 3 8k55 4 10kPTC 7 11 T UNIT Display in C or F C 0 0 C F 1 12 T ADJ Calibrate temperature Adjust to allow for cable resistance None 13 T COMP Set temp com...

Страница 54: ...laboratory etc They are determined independently of the measuring loop NOTE it is not necessary to enter this data in most cases as the EXA automati cally does this while performing a calibration The...

Страница 55: ...arameter Press YES to confirm 1 mV resolution then set value with ENT keys ASPmV Set As Pot ORP For parameter 2 when activated in service code 02 23 ASP 1D Set As Pot ORP For the main parameter ORP Pr...

Страница 56: ...A2 as temperature The choices for mA1 on terminals 61 62 are linear ORP ORP table output 21pt curve The choices for mA2 a terminal 64 65 are linear ORP ORP table linear temperature ORP control PI P I...

Страница 57: ...everse For rising signal set 0 0 Reverse acting PI control for decreasing mA output For rising signal set 1 for increasing mA output 32 BURN Burn function mA 1 No burnout 0 0 0 No Burn mA 1 Burnout do...

Страница 58: ...or a wash controller For S4 There is the extra possibility to set up for FAIL indication Digit Y sets the control action Process alarm is a simple On Off trip controlled by the high low setpoint Propo...

Страница 59: ...rol 2 interrupted Temperature alarm 3 Alarm on main process 0 Main PI control on main process 1 Alarm on rH 2 PI control on rH 3 42 S3 Relay 3 settings Off 0 4 0 0 Low setpoint 1 High setpoint 2 HOLD...

Страница 60: ...erates full output in proportional control This is in the units of the main parameter pH or mV rH RNG This is the proportional range in rH and is only enabled when the converter is set up for rH measu...

Страница 61: ...rH proportional control selected in 2 rH code 40 41 42 or 43 PER Duty cycle period Pulse control On time Off time fig 5 3 10 sec FREQ Maximum frequency 100 value for frequency control fig 5 4 70 p m 4...

Страница 62: ...act closure All the other contacts controls are inhibited except HOLD contacts and a Fail signal is transmitted on the outputs when enabled in code 32 Soft fail gives a flashing FAIL flag in the displ...

Страница 63: ...r 5 1 Impedance high input 1 Soft fail 0 Impedance high input 1 Hard fail 1 1 Hard Err 4 2 Impedance low input 2 Soft fail 0 Impedance low input 2 Hard fail 1 1 Hard Err 5 2 Impedance high input 2 Sof...

Страница 64: ...when wanting to change from one application to another Code 71 tH CHK The wash cleaner can be used to test the response of the electrode system see fig 5 5 The online response check gives a very good...

Страница 65: ...defaults Reset configuration to default values 71 tH CHK Half time check Response check when washing Off 0 0 Off Response check when washing On 1 72 W REV Wash reverse Long wash short measuring time...

Страница 66: ...to check the QIC factory generated test certifi cate To use this test feature it is necessary to have the detail provided only in the QIS Quality Inspection Standard or the Service manual NOTE attemp...

Страница 67: ...t functions as detailed in QIS and Service Manual Code Display Function Function detail X Y Z Default values Not used 90 99 NOTE Do not enter codes higher than 80 without authority as altering the fac...

Страница 68: ...IM 12B6B3 E H...

Страница 69: ...l 2 point calibration with solutions other than the NIST buffers that are listed in the calibration tables In this case the solutions are applied sequentially as in the AUT CAL method but the user det...

Страница 70: ...AY HOLD NO MODE YES ENT YOKOGAWA MODE TEMPERATURE AUT CAL pH CONTACTS S1 S2 WASH S3 FAIL S4 NO YES pH Automatic Calibration Press the MODE key AUT CAL appears in the display and the YES NO key prompt...

Страница 71: ...en waits for the reading to stabilize The pH display flashes When the reading is stable the CAL END message appears Press YES WAIT flashes briefly then HOLD The calibration is now complete Put the sen...

Страница 72: ...MODE YES ENT YOKOGAWA MODE TEMPERATURE AUT CAL pH CONTACTS S1 S2 WASH S3 FAIL S4 pH NO YES Manual Calibration 2nd parameter calibration Press the MODE key The legend AUT CAL appears and the YES NO ke...

Страница 73: ...YES YES Return to measuring mode YES YES Return to measuring mode Adjust value with ENT Keys NO Manual Calibration of zero point according to IEC 746 2 Manual Calibration of mV offset for ORP 2nd para...

Страница 74: ...end AUT CAL appears and the YES NO key prompt flags flash Press NO The display MAN CAL appears Press YES to start calibration NO YES NO YES Note Press NO to start calibration of zero point when enable...

Страница 75: ...ng the ENT key Select the flashing digit with the key Increase its value by pressing the key When the correct value is displayed press ENT to enter the change Press YES to return to the measuring mode...

Страница 76: ...IM 12B6B3 E H...

Страница 77: ...Periodic maintenance for the sensor system NOTE Maintenance advice listed here is intentionally general in nature Sensor maintenance is highly application specific The sensor system must be kept clean...

Страница 78: ...quids have a limited shelf life especially alkaline buffers which absorb CO2 from the air 3 Yokogawa strongly recommends NIST primary buffer standards in order to ensure the best accuracy and best buf...

Страница 79: ...m Also the EXA PH402 checks the electrodes during calibration to determine if the reaction time is suitable for pH measurement A specially timed check can be activated following each cleaning cycle Af...

Страница 80: ...oretical value 59 16 mV pH at 25 C it is accepted Otherwise the unit gener ates an error E3 Activation or deactivation of the asymmetry diagnostic check and slope check is made from the Service Codes...

Страница 81: ...mA T K1543AK Fuse box of 10 pieces for 115 V AC 250 V AC 100 mA T K1543AL Fuse box of 10 pieces for 24 V DC 250 V AC 1 A T K1543AM Fuse box of 10 pieces for 100 V AC 250 V AC 100 mA T K1543AL 9 Cable...

Страница 82: ...IM 12B6B3 E H...

Страница 83: ...12 T ADJ None 13 T COMP 0 Off T COEF 0 0 pH 10 C Calibration functions 20 t SEC 5 Sec pH 0 02 pH 21 AP LOW 120 mV AP HI 120 mV 22 SL LOW 70 SL HI 110 23 ITP 7 00 pH SLOPE 100 0 ASP 1D 0 0 mV ASP mV m...

Страница 84: ...S 0 0 0 all off 53 Err 4 1 1 hard fail Err 5 1 1 hard fail Err 4 2 1 hard fail Err 5 2 1 hard fail Err 07 1 hard fail Err 08 1 hard fail Err 09 1 hard fail Err 11 0 hard fail Err 16 0 hard fail Err 22...

Страница 85: ...mA1 mA2 display SL AP Z1 Z2 etc burn out disabled burn low 3 5 high 22 on mA1 mA2 code 32 password protection disabled for maint comm serv level code 52 autoreturn return to measure in 10 min enable o...

Страница 86: ...t condition for which the transmitter is set It is only necessary to consider this adjustment when installing a system with a different ITP Antimony systems and Pfaudler probes are good examples of sy...

Страница 87: ...ticular sensors selected Service codes 3 4 5 20 71 all con tribute to the diagnostics Please note that the default settings provide an excellent starting point and provide most valuable information ab...

Страница 88: ...ctions and alarms should all be set as described elsewhere in this manual 10 5 2 Calibration set up 4 The alternative Zero point calibration and display according to IEC 746 2 may be enabled in servic...

Страница 89: ...om is still correct This error happened arbitrary just after starting up the PH402 The reason is a software bug which is solved in version 1 3 The next features are added concerning mA1 2 output and c...

Страница 90: ...rument locked up when entering a wrong password When manual temperature is active and HIF is entered the manual value is showed for all temperature sensors To improve EEPROM integrity the PEN Program...

Страница 91: ...power Reducing power is indicated by positive values of mV rH This is a composite value that indicates the oxidizing power of a solution compen sating for the influence of the acid or alkaline compone...

Страница 92: ...ure sensor damaged Check connections E8 Measured temperature too low 30 C Process too cold Check process Wrong temperature sensor used Check sensor setting Temperature sensor damaged Check connections...

Страница 93: ...IM 12B6B3 E H...

Страница 94: ...2113 Tel 61 2 805 0699 Fax 61 2 888 1844 SINGAPORE Yokogawa Engineering Asia Pte Ltd 11 Tampines Street 92 SINGAPORE 528872 Tel 65 783 9537 Fax 65 786 2606 JAPAN Yokogawa Electric Corporation 2 9 32...

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