Yokogawa PH100 User Manual

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User’s Manual

Model PH100 Panel Mount pH Converter

IM 12B11A01-01E

1st Edition

r Introduction

This manual covers the specifications, installation, operation and maintenance of the panel-mount version of the PH100 pH converter. Please read this before using the PH100. There are manuals for the related EXA100 series as follows: Refer to them as required.

Model code Manual Name IM No.

PH100 Panel Mount pH Converter IM 12 B11A01-01E OR100 Panel Mount ORP Converter IM 12 C11A01-01E SC100 Panel Mount Conductivity Converter IM 12 D11A01-01E PH10FP KCl Refillable pH Sensor IM 12 B11C01-01E PH10RP KCl Replenish-free pH Sensor IM 12 B11C02-01E OR10FP KCl Refillable ORP Sensor IM 12 C11C01-01E OR10RP KCl Replenish-free ORP Sensor IM 12 C11C02-01E SC10XB Conductivity Sensor for SC100 IM 12 D11C01-01E WTB100 Terminal Box for EXA100 IM 12 B11E01-01E WF100 Extension Cable for EXA100 IM 12 B11F01-01E PH10HLD Immersion Holder for EXA100 IM 12 B11D01-01E PH10HG Guide-pipe Holder for EXA100 IM 12 B11D02-01E

T000.eps

Safety Precautions

IM 12B11A01-01E

r For the safe use of this equipment

(1) About This Manual

• This manual should be passed on to the end user.

• The contents of this manual are subject to change without prior notice.

• The contents of this manual shall not be reproduced or copied, in part or in whole, without permission.

• This manual explains the functions contained in this product, but does not warrant that they will suit the particular purpose of the user.

• Every effort has been made to ensure accuracy in the preparation of this manual. However, should any errors or omissions come to the attention of the user, please contact the nearest Yokogawa Electric representative or sales office.

• This manual does not cover the special specifications. This manual may be left unchanged on any change of specification, construction or parts when the change does not affect the functions or performance of the product.

• If the product is used in a manner not specified in this manual, the safety of this product may be impaired.

(2) Safety and Modification Precautions

• Follow the safety precautions in this manual when using the product to ensure protection and safety of personnel, product and system containing the product.

(3) The following safety symbols are used on the product as well as in this manual.

DANGER

This symbol indicates that the operator must follow the instructions laid out in this manual in order to avoid the risk of personnel injury, electric shock, or fatalities. The manual describes what special care the operator must exercise to avoid such risk.

WARNING

This symbol indicates that the operator must refer to the instructions in this manual in order to prevent the instrument (hardware) or software from being damaged, or a system failure from occurring.

CAUTION

This symbol draws attention to information essential for understanding the operation and functions.

Tip

This symbol gives information that complements the current topic.

SEE ALSO

This symbol identifies a source to which to refer.

Protective Ground Terminal

Function Ground Terminal (Do not use this terminal as the protective ground terminal.)

Alternating current

IM 12B11A01-01E

r NOTICE and Cautions

• Check specifications When the instrument arrives, unpack the package with care and check that the instrument has not been damaged during transportation. In addition, please check that the specification matches the order, and required accessories are not missing. Specifications can be checked by the model codes on the nameplate. Refer to Chapter 1.2 Specifications for the list of model codes.

• Details on operation parameters When the PH100 panel mount pH Converter at the user site, it will operate based on the operation parameters (initial data Table 5.1 to 5.5) set before shipping from the factory. Ensure that the initial data is suitable for the operation conditions before conducting analysis. Where necessary, set the instrument parameters for appropriate operation. For details of setting data, refer to chapters 4 to 5. When user changes the operation parameters, it is recommended to note down the changed setting data.

Safety Precautions

Front Panel of PH100

IM 12B11A01-01E

iii

LED Display Symbols

• Alphanumerics are represented as follows on the LED display

Alphanumerics Alphanumerics AlphanumericsLED Display LED Display LED Display

IM 12B11A01-01E

r After-sales Warranty

d During the warranty period, for repair under warranty carry or send the product to the

local sales representative or service office. Yokogawa will replace or repair any damaged parts and return the product to you.

d Before returning a product for repair under warranty, provide us with the model

name and serial number and a description of the problem. Any diagrams or data explaining the prpoblem would also be appreciated.

d If we replace the product with a new one, we won’t provide you with a repair report. d Yokogawa warrants the product for the period stated in the pre-purchase quotation.

Yokogawa shall conduct defined warranty service based on its standard. When the customer site is located outside of the service area, a fee for dispatching the maintenance engineer will be charged to the customer.

d In the following cases, customer will be charged repair fee regardless of warranty

period.

• Failure of components which are out of scope of warranty stated in instruction

manual.

Safety Precautions

• Failure caused by usage of software, hardware or auxiliary equipment, which

Yokogawa Electric did not supply.

• Failure due to improper or insufficient maintenance by user.

• Failure due to modification, misuse or outside-of-specifications operation which

Yokogawa does not authorize.

• Failure due to power supply (voltage, frequency) being outside specifications or

abnormal.

• Failure caused by any usage out of scope of recommended usage.

• Any damage from fire, earthquake, storms and floods, lightning, disturbances, riots,

warfare, radiation and other natural changes.

d Yokogawa does not warrant conformance with the specific application at the user

site. Yokogawa will not bear direct/indirect responsibility for damage due to a specific application.

d Yokogawa Electric will not bear responsibility when the user configures the product

into systems or resells the product.

d Maintenance service and supplying repair parts will be covered for five years after

the production ends. For repair for this product, please contact the nearest sales office described in this instruction manual.

IM 12B11A01-01E

Contents

r Introduction ...................................................................................................................... i

r For the safe use of this equipment ................................................................................ ii

r NOTICE and Cautions ..................................................................................................iii

r After-sales Warranty ...................................................................................................... v

1. Overview .....................................................................................................................1-1

1.1 EXA PH100 pH converter .............................................................................. 1-1

1.2 Check the specifications ................................................................................. 1-1

1.3 Features of the EXA PH100 pH converter..................................................... 1-2

1.4 Standard Specifications ................................................................................... 1-2

2. Preparation for Operation ........................................................................................2-1

2.1 Unpacking ....................................................................................................... 2-1

2.2 Choosing an Installation Location .................................................................. 2-1

2.3 External Dimensions ....................................................................................... 2-2

2.4 Panel Cutout Dimensions................................................................................ 2-3

2.5 Mounting ......................................................................................................... 2-4

3. Wiring..........................................................................................................................3-1

3.1 Pulling in Wiring............................................................................................. 3-2

3.2 Noise prevention ............................................................................................. 3-3

3.3 Wiring Terminal Diagram............................................................................... 3-4

3.4 pH detector wiring .......................................................................................... 3-7

3.5 Wiring cable to intermediate terminal box..................................................... 3-9

3.6 Output Signal Cable Wiring ........................................................................... 3-9

3.7 Contact output wiring. .................................................................................... 3-9

3.7.1 Wiring when S1 is used .......................................................................... 3-9

3.7.2 Wiring for S2 (for two-contact-output case) or S2,

S3 and S4 (four-contact output case).................................................... 3-11

3.8 Power and Ground Wiring ............................................................................ 3-12

4. Overview of Operation Panel ................................................................................... 4-1

4.1 Overviews of names and functions of operation panel keys ......................... 4-1

4.2 Key Operation ................................................................................................. 4-2

4.3 Switching display screens ............................................................................... 4-3

4.4 Display screen examples ................................................................................. 4-4

4.4.1 Initial display ........................................................................................... 4-4

4.4.2 Measurement screen ................................................................................ 4-5

4.4.3 Calibration screen .................................................................................... 4-6

4.4.4 Setting screen........................................................................................... 4-7

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vii

5. Operation .................................................................................................................... 5-1

5.1 Start up ............................................................................................................ 5-1

5.1.1 Check wiring ........................................................................................... 5-1

5.1.2 Start up pH converter .............................................................................. 5-1

5.1.3 Data setting .............................................................................................. 5-1

5.1.4 Temperature Calibration........................................................................ 5-10

5.1.5 Calibration with Standard Liquid.......................................................... 5-10

5.2 Test Operation ............................................................................................... 5-11

5.3 Normal operation .......................................................................................... 5-11

5.4 Stopping and Restarting Operation............................................................... 5-11

6. Calibration with standard solution .......................................................................... 6-1

6.1 Important issues relating to calibration with standard solution ..................... 6-1

6.2 Calculations involved in Calibration with Standard Solution........................ 6-2

6.3 Preparation ....................................................................................................... 6-5

6.4 Auto calibration with standard solution .......................................................... 6-8

6.4.1 Setting parameters for auto calibration ................................................... 6-8

6.4.2 Procedure for auto calibration ................................................................. 6-8

6.5 Manual Calibration with Standard Solution ................................................. 6-12

6.5.1 Manual Calibration Parameter Settings ................................................ 6-12

6.5.2 Procedure for Manual Calibration......................................................... 6-12

6.6 Canceling Calibration .................................................................................... 6-14

6.7 Error during Calibration................................................................................ 6-14

6.7.1 Recovering from an Error ..................................................................... 6-14

6.7.2 Quitting calibration................................................................................ 6-14

7. Maintenance and Cleaning ....................................................................................... 7-1

7.1 Periodic Maintenance...................................................................................... 7-1

7.1.1 Electrode cleaning ................................................................................... 7-1

7.1.2 Calibration with Standard Liquid............................................................ 7-1

7.1.3 Checking the KCl in the Detector........................................................... 7-1

7.2 Preventative Maintenance ............................................................................... 7-2

7.2.1 PH Converter Terminal Isolation ............................................................ 7-2

7.2.2 Check the Display of the pH Converter ................................................. 7-2

8. Troubleshooting .......................................................................................................... 8-1

8.1 Unexpected value displayed

(narrowing down problem to converter or sensor) ........................................ 8-1

8.2 Error Display ................................................................................................... 8-4

8.3 Fixing Error Status .......................................................................................... 8-4

8.3.1 Error 1 pH Measurement Out of Range ................................................ 8-4

8.3.2 Error 2 Temperature Measurement Out of Range................................. 8-4

8.3.3 Error 3 Temperature Sensor Abnormal ................................................. 8-5

8.3.4 Converter Abnormal ................................................................................ 8-5

8.3.5 Calibration Error...................................................................................... 8-5

8.3.6 Asymmetry Potential Abnormal.............................................................. 8-6

8.3.7 Abnormal Slope of sensor emf characteristic ......................................... 8-6

8.3.8 Unstable Sensor Reading ......................................................................... 8-6

Revision Record .................................................................................................................... i

viii

IM 12B11A01-01E

1. Overview

1.1 EXA PH100 pH converter

The EXA PH100 pH converter is a panel-mount unit with built-in general-purpose preamp, large 4-digit LED display for measured value and 4-digit LED display for settings.

1.2 Check the specifications

The model number and suffix codes are shown below. Check that what you were supplied is the same as what you ordered.

1. Overview

Model

PH100

Label language

Contact output

Temperature sensor

Option

Suffix code Option code Description

Panel mounted pH converter

-A

-E

-J

-21

-41

-T1

-T2

-T3

-T4

-NN

Construction

Always -A English Japanese 2 contact outputs 4 contact outputs Pt1000/Pt100 Pt1000/500 Ω Pt1000/10 kΩ Pt1000/6.8 kΩ Always -NN IP65/65

T1.2E.EPS

IM 12B11A01-01E

1-1

1.3 Features of the EXA PH100 pH converter

(1) Large 4-digit display. Both measured pH value and temperature can be displayed at the same time.

(2) You can easily calibrate the unit with pH4, pH7 or pH9 standard solution. (3) You can select either two output contacts or four ; and you can select each contact

output type from : high, low, high high, low low, and high high / low low. (4) Isolated 4 to 20 mA analog output of measured value. (5) Calibration values and measured values can be read to 0.01 pH, making high accuracy

measurement and calibration possible. (6) The operation panel is rated for operation in an IP55. IP65 is optional. (7) 96 mm x 96 mm DIN size panel mount instrument. Depth is 120 mm and weight is

600 g. (8) Full set of self-diagnostic functions with indication of errors such as measurement

out of range, converter abnormal, calibration-time error.

1.4 Standard Specifications

Measurement : Hydrogen ion concentration (pH) of a solution Measuring range : -2.00 to 14.00 pH Indication

Display

Display : Digital (LED) Range : -2.00 to 16.00 pH Resolution : 0.01 pH (pH reading), 1 8C (temperature reading) Indication items : pH reading, setting, status, temperature *

*1: Indication “enabled/disabled” selectable

Input signal

pH input range : -2 to 16 pH pH input impedance : 1012 V or more Temperature input *2 : Pt1000/Pt100, Pt1000/500 V, Pt1000/10 kV, Pt1000/6.8 kV

*2 : Must be specified when ordering.

Temperature input range : -10 to 110 8C

Transmission signal output

Number of output points : 1 output, pH reading only Output signal : 4 to 20 mA DC, isolated Load resistance : 600V or less Transmission signal range : Configurable within pH-2.0 to pH 16.0 (Detault : pH0.0 to

pH 14.0)

Minimum span : 2 pH Maintenance output signal : Output hold “enabled/disabled” selectable Hold output value : Last measured value/preset value (2.0 to 20.8 mA) selectable Fail output signal : Downscale burnout (2 mA) “enabled/disabled” selectable

1-2

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Contact output

Contact type : Relay contact output Number of contacts : 2 or 4 outputs (must be specified when ordering) Contact action : On/Off action Contact functions : Selectable; High, low, high-high, low-low, high-high/low-low limit

alarms, FAIL Contact output hysteresis : 0.0 to 4.0 pH (configurable) Contact output delay time : 0 to 200 seconds (configurable)

Contact rating : When 2 contact outputs specified

S1 : 240 VAC 3A or 30 V DC 3A (resistance load), Form C (NC/NO/COM, 3 terminals) S2 : 240 VAC 3A or 30 V DC 3A (resistance load), Form A

When 4 contact outputs specified

S1 : 240 VAC 3A or 30 V DC 3A (resistance load), Form C (NC/NO/COM, 3 terminals) S2, S3, S4 : 240 V AC 3A or 30 V DC 3A (resistanceload), Form A, shared common Maximum load current on common is 3A.

Contact status:

Table 1.1

Contact

S1 NO-COM Open Open Closed Open Closed Open NC-COM Closed Closed Open Closed Open Closed S2 Open Open Closed Open Closed Open S3 when specified Open Open Closed Open Closed Open S4 when specified Open Open Closed Open Closed Open

Note: When a contact is activated, the LED on display panel turns on.

Function selected

H, L, HH, LL, HH/LL limit alarms FAIL

Power off

Power on

No alarm Alarm No alarm Alarm

Power off

Power on

Terminal

COM

1. Overview

NC NO

Ambient temperature : -5 to 45 8C Storage temperature : -25 to 70 8C Ambient humidity : 10 to 90% RH, non-condensing Installation altitude : 2000 m or less above sea level Construction : Front panel : Dust-proof and drip-proof construction IP55,

IP65 (when “/65” option specified) Materials : ABS resin and polycarbonate Power supply : Rated voltage 100 to 240 V AC (610%), 50/60 Hz Power consumption : Max. 9 VA Weight : Approx. 600g Dimensions : 96 (W) 3 96 (H) 3 120 (D) mm Mounting : Panel mount Panel cutout dimensions : 92 (W) 3 92 (H) mm Wiring : M3.5 screw terminal Grounding : grounding resistance 100 V or less

Functional specifications

Asymmetry potential adjustment range : 762 pH Slope adjustment range : 70 to 110% of theoretical value Automatic temperature compensation range : -10 to 110 8C, manual temperature

compensation available (setting range : -10 to 110 8C)

Temperature correction function (cable length correction by one-point temperature

calibration)

IM 12B11A01-01E

1-3

Calibration function

One touch automatic calibration (one or two point calibration)

Standard solution table : Selectable : JIS • NIST Table (4, 7, 9 pH)

DIN 19267 Table (4, 7, 9 pH) US Technical Buffer Table (4, 7, 10 pH)

Standard solution temperature range : 0 to 95 8C for JIS • NIST Table

0 to 90 8C for DIN 19267 Table 0 to 60 8C for US Technical Buffer Table

Manual calibration (one or two point calibration at specified setpoint(s))

Self-diagnostics function

FAIL output : pH measurement range failure, temperature measurement range failure,

temperature detection element failure, and converter failure Detection during calibration, error indication :

Standard solution temperature range failure, asymmetry potential failure,

electromotive force slope failure, stability failure Converter performance : under normal operating conditions Linearity : 60.03 pH Repeatability : 60.02 pH Transmission output accuracy : 60.3% of span Sensors connectable with PH100 : PH10FP, PH10RP, PH8EFP, PH8ERP, FU20 (no

ORP measurement available) Sensors conditionally connectable : PH8ERG, PH8EFG, other companies’ sensors (no

temperature compensation available, manual temperature compensation

required) Maximum total connection cable length : 50 m (sensor cable length included)

1-4

IM 12B11A01-01E

2. Preparation for Operation

2.1 Unpacking

When the instrument arrives, unpack the package with care and check that the instrument has not been damaged during transportation. In addition, please check that the specification matches the order, and required accessories are not missing.

2.2 Choosing an Installation Location

WARNING

To minimize the danger of shock, the converter should be mounted on the converter panel before power is applied.

2. Preparation for Operation

When choosing a mounting location: Mounting Cautions

CAUTION

(1) Mount the converter in a location which allows adequate space for access from the

rear for wiring and the like,

(2) Ideally the converter should be on the rear of a panel, so that unauthorized personnel

will not have access to the terminals, (3) It should be a place with minimal vibration, (4) It should not be exposed to corrosive gas atmospheres, (5) Temperature should be near normal (23 8C) with minimal change, (6) Humidity should be between 10% and 90% RH, (7) The converter should not be exposed to direct heat radiation, (8) The converter should not be exposed to strong magnetic fields, (9) The converter should not be exposed to moisture, (10) The converter should not be mounted near flammable materials, (11) The converter should not be exposed to strong UV light.

The case of the converter is made of flammable polycarbonate resin, and the bezel is flammable ABS resin, so the converter should not be mounted above flammable materials.

IM 12B11A01-01E

If there will be flammable materials in the vicinity, they should be separated from the converter top, bottom, left and right sides by a clearance of at least 150 mm, and the converter covered by a plated steel plate at least 1.43 mm thick, or an uncoated steel plate of thickness 1.6 mm.

2-1

150 mm

Fig. 2.1

2.3 External Dimensions

• pH Converter

150 mm

F2.1.EPS

Unit : mm

Shield cover

EXA PH100

S1S2S3

SET CAL MEAS ENT

CANCEL

118

Panel depth : 1 to 10

100

1-10 4151-60

Terminal cover

91.6

F003.EPS

111

2-2

Fig. 2.2

IM 12B11A01-01E

2.4 Panel Cutout Dimensions

2. Preparation for Operation

145 Min.

Fig. 2.3

125 Min.

+0.8 0

Unit : mm

+0.8

IM 12B11A01-01E

2-3

2.5 Mounting

Insert from this Side of panel

Large brackct (mount at top)

Panel

Terminal board

Insert driver as shown to tighten bracket

Small bracket (mount at bottom)

Fig. 2.4

Procedure 1

Cut out panel to mount instrument, cut out dimensions are shown on previous page.

Procedure 2

Insert rear of instrument (terminal block side) in panel cutout.

Procedure 3

Mount top and bottom brackets (see figure) to fix instrument to panel.

*When detector output is to be prewired, refer to Sec. 3.4(2)

WARNING

If instrument is a tight fit in cutout, do not force it as case or mounting brackets may be damaged.

2-4

IM 12B11A01-01E

WARNING

The instrument may be installed with the rear inclined at an angle up to 308 below front. Do not incline with front below rear.

2. Preparation for Operation

Up to 308

Fig. 2.5

F2.5.EPS

IM 12B11A01-01E

2-5

2-6

IM 12B11A01-01E

3. Wiring

This section explains wiring of the EXA PH100 pH converter.

WARNING

Be sure to turn off power supply, and check with a tester or the like that connected cables do not have dangerous voltages applied. Do not touch terminals if power may be applied.

The recommended specifications for wiring terminals are shown below. Use crimp-on terminals, designed to fit an ISO M3.5 screw, with an insulating sleeve.

3. Wiring

3.7mm\

Up to 7mm

Fig. 3.1

d Recommended terminals

Table 3.1

Maker

Japan AMP Co., Ltd JST Co., Ltd

model

1.25-YS3A YD1.25-3.5

For wire size:

0.3~1.65mm

Up to 7mm

3.7mm

Tightening torque

0.8N . m (8 kgf . cm) Up to or Iess

F3.1.EPS

T3.1.EPS

IM 12B11A01-01E

3-1

3.1 Pulling in Wiring

When wiring cables to terminals on the rear of the instrument, pull the cables into the instrument in the direction shown in Fig. 3.2

CAUTION

There’s a terminal wiring diagram on the instrument nameplate on the side of the instrument.

Pull in cable from left side

Terminal name Terminal name

S1(NC) S1(NO)

COM1

COM2

L N

1 2 3 4 5 6 7 8 9

11 12 13 14 15

17 18 19 20

S RE

RES

SE T1

T2 mA (1) mA (2)

Analog output cable

Converter rear panel

Power wiring

Ground wire

pH sensor cable

Fig. 3.2 Direction to pull in wiring

F3.2.EPS

3-2

IM 12B11A01-01E

3.2 Noise prevention

d Noise sources The following are typical sources of electrical noise

* Relays and contacts * Solenoid coil, solenoid valve * Power lines * Inductive loads * Inverters * Motor commutators * SCRs used for phase-angle control * Wireless transmitters * Welding equipment * High-voltage ignition systems

d Noise prevention When wiring, take the following precautions to minimize the effects of noise:

* Keep input circuit wiring as far as possible from power or ground wiring. * Shielded wires, with single-point grounding, are effective for minimizing pickup of static electric fields. * Twisted pair wire is effective in minimizing inductive noise pickup.

3. Wiring

IM 12B11A01-01E

3-3

3.3 Wiring Terminal Diagram

There are wiring terminals on the rear of the PH100 converter. Wire to terminals 1 to 10 and terminals 11 to 20 as shown in Fig. 3.3. The terminal block cannot be removed.

Row of terminals numbered 1 to 10 from top to bottom

Fig. 3.3 Cable wiring position

(1) When intermediate terminal box is used

CAUTION

Terminal size is ISO M3.5. There’s a terminal wiring diagram on the instrument nameplate on the side of the instrument.

Row of terminals numbered 11 to 20

Not used

1-10

Contact output and power wiring pH sensor and Analog output cable

31-40 21-30

PH100 Top view

11-2051-61 41-50

from top to bottom

F3.3.EPS

Contact output 1(NC)

Contact output 1(NO)

Contact output 2

Contact

*3)

output 3 Contact

*3)

output 4

Power supply

Ground to earth (grounding resistance 100V or less)

Note : Terminal numbers are indicated on the label side of the converter.

3-4

Converter Rear View

1 2 3 4 5 6 7 8 9

Terminal

name

S1(NC)

S1(NO)

COM1

S2 S3 S4

COM2

L N

Terminal name

RES

SE T1

T2 mA(1) mA(2)

11 12 13 14 15 16 17 18 19 20

Extension cable WF100-PH *2)

Output signal

Shield

Ground to earth (grounding resistance 100V or less)

Fig. 3.4 Wiring diagram when intermediate terminal box is used

Terminal box WTB100-PH *1)

RES

SE T1 T2

pH sensor

F3.4E.EPS

IM 12B11A01-01E

Contact output (NC) Contact output (NC)

Contact output 2

*3)

Contact output 3

*3)

Contact output 4

Power supply

Ground to earth

(grounding resistance 100V or less)

(2) When intermediate terminal box is not used

CAUTION

Terminal size is ISO M3.5. There’s a terminal wiring diagram on the instrument nameplate on the side of the instrument.

3 4 5

6 7 8 9

Terminal (contact)

S1(NC) S1(NO) COM1

S2 S3 S4

COM2

L N

Converter rear view

Terminal

name

GE S RE RES SE T1

T2 mA (1) mA (2)

3. Wiring

11 12 13 14 15 16 17 18 19

Output signal

Shield

Ground to earth

(grounding resistance 100V or less)

pH Sensor

F3.5.EPS

Fig. 3.5 Wiring diagram when intermediate terminal box is not used

*1) Intermediate terminal box WTB100 is used when pH converter and pH sensor are far apart. *2) Extension cable WF100 is used when pH converter and pH sensor are far apart. *3) When only two contact outputs are specified, contact outputs 3 and 4 (S3 and S4) are not used. When four contact outputs are used, S3 and S4 share the same common lead (COM2).

IM 12B11A01-01E

3-5

Table 3.2 Terminal wiring example

Terminal no. Signal name Signal description

S1(NC)

S1(NO)

COM1

COM2

RES

Contact output 1 (relay contact) NC

Contact output 1 (relay contact) NO

Contact output 1 (common)

Contact output 2 (relay contact)NO

Contact output 3 (relay contact) NO

Contact output 4 (relay contact) NO

Contact output 2 (common) (shared by S2,S3 & S4)

Power line L

Power line N

Ground

Reserved

Glass electrode input terminal

Glass electrode shield terminal

Reference electrode input terminal

Reference electrode shield terminal

Ground electrode (cable shield) terminal

Temperature input terminal 18

CAUTION

Figures 3.4 and 3.5 seem to indicate that cable can be pulled in from right hand side, but in fact cable can only be pulled in from left hand side as described in Sec. 3.1

mA(1)

mA(2)

Temperature input terminal

Analog output terminal (1)

Analog output terminal (2)

T3.2.EPS

3-6

IM 12B11A01-01E

3.4 pH detector wiring

This section describes connection of the Model PH10FP KCl Refillable pH sensor or the Model PH10RP KCl Replenish-free pH sensor to the EXA PH100 pH converter.

CAUTION

For a description of how to connect these sensors via extension cable and intermediate terminal box, refer to IM 12B11E01-01E for the EXA WTB100 intermediate terminal box, and refer to IM 12B11F01-01E for the EXA WF100 extension cable.

The procedure for connecting a sensor to the EXA PH100 pH converter is as follows: (1) Loosen the two holding screws to remove the shielding cover (which covers the

terminals used for connecting a pH detector) from the rear of the EXA PH100 pH sensor.

(2) Connect the pH sensor (detector) by cable to the terminals. The color coding of the

wires in the cable and the corresponding terminals that they are connected to are listed below:

3. Wiring

pH converter terminal no. Cable core color code for

PH10FP and PH10RP pH sensors

11 Do not use 12 Red (GE) 13 Yellow (S) 14 Brown (RE) two wires 15 Do not use 16 Green (SE) 17 White (T1) 18 Black (T2)

pH converter terminal no. Cable core color code for

PH8EFP and PH8ERP pH detectors

11 Do not use 12 Red (GE) 13 Yellow (S) 14 Brown (RE) 15 Do not use

IM 12B11A01-01E

16 Green (SE) 17 White (T1)

18 Black (T2)

CAUTION

When using the PH8EFP or PH8ERP which have pin terminals, be sure to replace the SE pin terminal with a forked terminal, as if you use the pin terminal is prone to pulling out, resulting in unreliable measurements.

3-7

pH converter terminal no. Cable core color code for

CAUTION

When using the PH8EFG or PH8ERG which have pin terminals, be sure to replace the SE pin terminal with a forked terminal, as if you use the pin terminal is prone to pulling out, resulting in unreliable measurements. You can’t measure temperature by connecting … to T1, T2 -- use manual temperature compensation.

PH8EFG and PH8ERG pH detectors

11 Do not use 12 Red (GE) 13 Yellow (S) 14 Brown (RE) 15 Do not use 16 Green (SE) 17 White (T1) 18 Black (T2)

pH converter terminal no. Cable core code for FU20 pH detectors

CAUTION

FU20 cable core numbers do not agree with converter terminal numbers, so care is required.

(3) Use wiring clips to hold the pH sensor cable in place. (4) Replace the shielding cover removed instep (1) above. Be careful not to pinch the

sensor wiring with the cover when replacing it.

11 Do not use 12 15 (GE) 13 16 (S) 14 13 (RE) 15 Do not use 16 14 (SE) 17 11 (T1) 18 12 (T2)

3-8

IM 12B11A01-01E

3.5 Wiring cable to intermediate terminal box

When the EXA PH100 pH converter is separated by a distance from the pH detector, use the EXA WTB100 terminal box and EXA WF100 extension cable to connect them.

3.6 Output Signal Cable Wiring

DANGER

To minimize the danger of shock, before connecting or disconnecting wires be sure to confirm that the pH converter power is OFF.

The output signal wiring from the PH100 converter connects to recorders or the like. Use two-core shielded cable for this wiring.

(1) Connect connecting cable to the terminals. Be sure to use the recommended termi-

nals and be sure that they are the correct size for the cable copper core diameter.

(2) As shown in Figures 3.4 and 3.5 of Section 3.3, ground to earth and ground connec-

tion at one point only.

3. Wiring

3.7 Contact output wiring.

3.7.1 Wiring when S1 is used

A terminal cover is fitted to reduce the risk of electric shock when power is applied. When connecting contact output wiring, you need to loosen the two cover screws to remove the cover. After completing the wiring, take care not to forget to replace the cover.

Load

Fig. 3.6 Relay contact output wiring

* If you want to connect a load which exceeds the contact rating (voltage rating 240 V

AC, current rating 3A resistive load, 30 VDC 3A resistive load) then you need to use a slave relay.

* If you connect an inductive load like a solenoid valve or slave relay then in parallel

with the contacts you should connect a CR filter (when switching AC) or a diode (when switching DC), or contact live may be affected.

Terminal no.

COM

F3.6.EPS

IM 12B11A01-01E

3-9

WARNING

* Be sure to disconnect power before removing the terminal cover. Since there is the danger of shock, turn off power and confirm that terminals are not live before wiring. Under no circumstances should terminals be touched when power is applied.

Recommended CR filters Table 3.3

Maker Models

MATSUO Electric co.,Ltd

SHIZUKI Electric co.,Ltd

RUBYCON Corporation

• For an DC relay

Instrument

Fig. 3.7

CR UNIT 953, 955 etc.

SKV, SKVB etc.

CR-CFS, CR-U etc.

Relay (coil rating must not exceed converter contact rating)

T3.3.EPS

External DC source

Diode (mount directly on relay coil terminals or socket)

F3.7.EPS

3-10

• For an AC relay

Instrument

Fig. 3.8

External AC source

CR filter (mount directly on relay coil terminals or socket)

Relay (coil rating must not exceed con veter contact rating)

F3.8.EPS

IM 12B11A01-01E

3. Wiring

3.7.2 Wiring for S2 (for two-contact-output case) or S2, S3 and S4 (four-contact output case)

(1) If you want to connect a load which exceeds the contact rating (voltage rating 240 V

AC, current rating 3A resistive load, 30 VDC 3A resistive load) then you need to use a slave relay as shown in Sec. 3.7.1.

(2) If switching a very small current, then -- if possible – connecting a bleeder resistor in

parallel with the relay (or the like) that is the load, can improve contact reliability.

(3) If you connect an inductive load like a solenoid valve or slave relay then in parallel

with the contacts you should connect a CR filter (when switching AC) or a diode (when switching DC), or contact life may be affected. Contact life is typically at least 10,000 switching operations with a resistive load.

(4) Use the recommended terminals to terminate connecting cables, and make sure that

they are the correct size to match the cable core diameter.

Terminal no.

Load

Fig. 3.9

Load

COM

F3.9.EPS

IM 12B11A01-01E

3-11

3.8 Power and Ground Wiring

* Power: This wiring should connect a power source of the correct voltage and fre-

quency to the EXA PH100 pH Converter. The power wiring should be heavy vinyl sheath cable rated at 600V (specifications equivalent to JIS C 3307).

* Ground: Ground to earth (ground resistance 100 ohms or less). Use a sufficiently

heavy cable (cross sectional area of 2 mm2 or greater).

* Use the recommended terminals to terminate connecting cables, and make sure that

they are the correct size to match the cable core diameter.

WARNING

CAUTION

The EXA PH100 pH converter does not have a power switch built in. You should add an on-off switch with two poles (to disconnect both sides of the power line).

3-12

IM 12B11A01-01E

WARNING

Any errors in power and ground wiring may damage the converter. Before applying power to the converter, be sure to check the wiring.

EXA PH100 pH converter Terminal no.

1 2 3

5 6

S1(NC)

S1(NO)

COM1

3. Wiring

Power

Fig. 3.10

Switch (provided by user)

Power wiring

COM2

F3.10.EPS

IM 12B11A01-01E

3-13

3-14

IM 12B11A01-01E

4. Overview of Operation Panel

4.1 Overviews of names and functions of operation panel keys

Measured value display

4-digit display When measuring: pH value is displayed When measuring or calibrating: numerical data and alphanumerics

Set/Ent key

m key. key

Status display

Four LEDs (When 2 contact outputs specified : two LEDs) *Display contact output status (lit when operated)

Fig. 4.1

Auxiliary display

4-digit display When measuring: temperature display (selectable) When setting: parameters

Keypad area

Three keys: *SET/ENT key * m key * . key

F4.1.EPS

IM 12B11A01-01E

4-1

4.2 Key Operation

On the EXA PH100 front panel there are three keys for screen/mode switching and data entry.

CANCEL

(A) (B) (C)

SET CAL MEAS

ENT

key

F4.2.EPF

Fig. 4.2 Layout of three keys on front panel

Main uses of these keys are as follows: (A) SET/ENT key: used to confirm mode changes and data settings

* From the measurement panel, if you press it continuously for at least three seconds then the data setting screen is displayed.

SET

Press for 3 sec. and

ENT

Fig. 4.3

(B) ( ) key: Use to select different menu item or reduce data setting value.

* Pressing this key for at least three seconds switches to the calibration screen.

SET (data entry screen) is displayed.

F4.3.EPS

CAL

Press for 3 sec. and CAL (calibration screen) is displayed.

F4.4.EPS

Fig. 4.4

* Pressing this key for at least three seconds from calibration or data setting top screen switches back to the measurement screen.

MEAS

Press for 3 sec. and MEAS (measurement screen) is displayed.

F4.5.EPS

Fig. 4.5

(B) + (C) Pressing both ( ) and ( )) screen simultaneously cancels operations

4-2

IM 12B11A01-01E

4.3 Switching display screens

EXA PH100 has three menu screens: measurement, calibration and data setting screens. The screen transition diagram is shown below.

Power ON

Initial display (4?4?1)

4. Overview of Operation Panel

Measurement screen

Press SET/ENT key for three seconds

Data setting screen

Fig. 4.6

(4?4?2)

(4?4?4)

Press ( ) key for 3 seconds

Press ( ) key for 3 sec.

Calibration screen

(4?4?3)

F4.6.EPS

IM 12B11A01-01E

4-3

4.4 Display screen examples

4.4.1 Initial display

Display when converter is normal.

(1) All LEDs are lit when converter is powered on.

Fig. 4.7 All LEDs lit

(2) Then all LEDs turn off.

4-4

Fig. 4.8 All LEDs off

IM 12B11A01-01E

(3) Measurement screen is displayed

4. Overview of Operation Panel

Fig. 4.9 Measurement screen with temperature display

4.4.2 Measurement screen

1) Measurement screen * Measurement display: Displays pH value. Decimal point is fixed; two digits below the decimal point. * Auxiliary display:

When temperature display functions are provided, the temperature and units (C for 8C, F for 8F) are displayed. When temperature display functions are not provided, nothing is displayed. (The initial setting is for no temperature display).

pH display - up to 2 digits below decimal point

When temperature display is provided

IM 12B11A01-01E

F4.7.EPS

Fig. 4.10

4-5

4.4.3 Calibration screen

(1) From Measurement screen

Press ( ) key for 3 sec. to transfer to Calibration screen

Press for at less 3 sec.

Fig. 4.11 Measurement screen

(2) Calibration screen

4-6

Fig. 4.12 Calibration screen (for Autocalibration case)

Press ( ) for at less 3 sec. to return to Measurement screen

IM 12B11A01-01E

4.4.4 Setting screen

4. Overview of Operation Panel

(1) Measurement screen display

Press SET/ENT screen for at least 3 sec. to transfer to Setting screen.

Press for at less 3 sec.

Fig. 4.13 Measurement screen (2) Setting screen

IM 12B11A01-01E

Fig. 4.14 Setting screen

Press ( ) for at less 3 sec. to return to Measurement screen

4-7

4-8

IM 12B11A01-01E

5. Operation

5.1 Start up

5.1.1 Check wiring

Check that all wiring is correct (refer to Sec. 3.3)

5.1.2 Start up pH converter

Apply power (100 to 240V AC 6 10% 50/60Hz) to EXA PH100 pH converter.

5.1.3 Data setting

Set the following parameters -- (1) analog output parameter, (2) calibration parameters, (3) alarm settings, and (4) other parameters -- in the order listed, to enable desired operation for process pH control:

(1) Analog output parameters

This screen is for user setting of analog-output-related settings

5. Operation

(2) Calibration parameters

This screen is for user setting of calibration-related settings

(3) Alarm parameters

This screen is for user setting of alarm-related settings

(4) Other parameters

This screen is for user setting of parameter settings other than (1) to (3) above.

Note

See Sec. 4 “Overview of Operation Manual” and table of LED display symbols in preface to this manual.

IM 12B11A01-01E

5-1

(1) Analog output parameter setting screen (Ao.PA displayed at top of screen)

This screen is for user setting of analog-output-related settings. A list of menu options on this screen is shown below:

Table 5.1

Name Parameter Setting range Initial value Note

Ao.PA Menu Title NA (not applicable) NA RL

Range low limit

22.0 ~ 16.0pH

0.0pH

High & low at least pH2 apart

M.HLd

H.Ao

F.HLd

Range high limit

Hold during Maintenance

Hold output setting

Hold if abnormal

22.0 ~ 16.0pH

0 : No Hold 1 : Hold 2 : Set value

2.0 ~ 20.8mA

0 : No Hold 1 : Burn out down scale (2mA)

14.0pH

1 : Hold

2.0

1 : Burn out down scale (2mA)

High & low at least pH2 apart

T5.1E.EPS

5-2

IM 12B11A01-01E

OR100EXA

S1S2S3

SET ENT

CANCEL

MEASCAL

Measurement screen

5. Operation

Example flow chart for analog output parameter setting is shown below

Press mkey for 3 esc

Low range limit

High range limit

Press SET/ENT for 3 sec.

S1S2S3

EXA OR100

Ao.PA flashing

Analog output parameter setting screen

SET/ENT key

Change value with m and . keys

EXA OR100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA OR100

S1S2S3

SET/ENT key

S1S2S3

EXA OR100

SET/ENT key rewrites data

S1S2S3

Hold during maintenance

S1S2S3

Hold output setting

S1S2S3

Hold if abnormal

Change value with m and . keys

EXA OR100

SET/ENT key

Change value with m and . keys

EXA OR100

SET/ENT key

Change value with m and . keys

EXA OR100

SET/ENT key

S1S2S3

EXA OR100

SET/ENT key rewrites data

Fig. 5.1 Example flow chart for analog output parameter setting

* Note: To cancel, press both ( ) and ( ) simultaneously.

F5.1.EPS

IM 12B11A01-01E

5-3

Hame

(2) Calibration parameter setting screen (CAL displayed at top of screen)

This screen is for user setting of calibration-related settings. A list of menu options on this screen is shown below:

Table 5.2

Parameter Setting range Initial value Note

CAL Menu Title CL.md Calibration

CL.Po Calibration

CL.2P

CL.1P

CL.tb

method

points

Two-point CAL std. liquid

One-point CAL std. liquid

Std. liquid cal.table

NA (not applicable) 0 : Autocalibration

1 : Manual calibration

0 : One-point 1 : Two-point calibration

0 : pH7, pH4 1 : pH9, pH7 (US: pH 10, pH7) 2 : pH9, pH4 (US: pH 10, pH4)

0 : pH7 1 : pH4 2 : pH9 (US: pH 10)

0 : JIS, NIST 1 : US 2 : DIN

NA 0 : Autocalibration

1 : Two-point calibration

0 : pH7, pH4

0 : pH7

0 : JIS, NIST

T5.2.EPS

5-4

IM 12B11A01-01E

Example flow chart for calibration parameter setting is shown below

EXA PH100

S1S2S3

EXA PH100

ENT

S1S2S3

SET CAL MEAS

CANCEL

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

S4S3S2

PH100EXA

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1S2S3

F5.2.EPS

Measurement screen

Perss m key for 3sec.

Press SET/ENT for 3 sec.

Perss m key for 3sec.

Perss . key Perss m key

CAL flashing Calibration parameter setting screen

SET/ENT key

Change value with m and . keys

SET/ENT key

CAL method setting

CAL points setting

SET/ENT key rewrites data

Change value with m and . keys

SET/ENT key rewrites data

SET/ENT key

Std. liquid for 2- point CAL

Change value with m and . keys

Std. liquid for 1- point CAL SET/ENT key

SET/ENT key rewrites data

Change value with m and . keys

Table type for Std.liquid CAL SET/ENT key

SET/ENT key rewrites data

5. Operation

IM 12B11A01-01E

Fig. 5.2 Example flow chart for calibration parameter setting

* Note: To cancel, press both ( ) and ( ) simultaneously.

5-5

(3) Alarm parameter setting screen (Alrm displayed at top of screen)

This screen is for user setting of alarm data. A list of menu options on this screen is shown below:

Table 5.3

Hame Parameter Setting range Initial value Note

Alrm top menu NA (not applicable) NA S1 S1 0: high limit alarm

HY1 dLY1 S1 delay time 0-200 seconds 0 S2 S2

HY2 dLY2

HY3 S3 hysteresis 0.0-4.0 pH 0.1 pH

dLY3 S3 delay time 0-200 seconds 0

S4 S4 0: high limit alarm

HY4 S4 hysteresis 0.0-4.0 pH

dLY4 S4 delay time 0-200 seconds 0

H.A

S1 hysteresis 0.0-4.0 pH 0.1 pH

S2 hysteresis 0.0-4.0 pH S2 delay time

high limit alarm

1: low limit alarm 2: high high limit alarm 4: high high limit/low low limited alarm 5: abnormal

0: high limit alarm 1: low limit alarm 2: high high limit alarm 4: high high limit/low low limited alarm 5: abnormal

0-200 seconds 0 0: high limit alarm

1: low limit alarm 2: high high limit alarm 4: high high limit/low low limited alarm 5: abnormal

1: low limit alarm 2: high high limit alarm 3: low low limit alarm 4: high high limit/low low limited alarm 5: abnormal

-2.0-16.0pH

0: high limit alarm

1: low limit alarm

0.1 pH

2: high high limit alarm when suffix

3: low low limit alarm

0.1 pH

14.0pH

code is -21, S3 does not appear

when suffix code is -21, HY3 does not appear

when suffix code is -21, dLY3 does not appear

when suffix code is -21, S4 does not appear

when suffix code is -21, HY4 does not appear

when suffix code is -21, dLY4 does not appear

L.A

HH.A high high limit alarm

LL.A low low limit alarm

low limit alarm 0.0 pH

5-6

-2.0-16.0pH

14.0pH

0.0 pH

T5.3.EPS

IM 12B11A01-01E

Example flow chart for setting alarm parameters is shown below

EXA PH100

S1S2S3

SET CAL MEAS ENT

Measurement screen

CANCEL

5. Operation

Press m key for 3 sec.

Press . key for 2 times.

S1 hysteresis

S1 delay time

S2 hysteresis

S2 delay time

S3 hysteresis

Press SET/ENT key for 3 sec.

EXA PH100

S1S2S3

Press m key for 2 times.

PH100EXA

S4S3S2

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1 S2S3S4

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Ao.PA flashing

ALrm flashing Alarm parameter setting screen

EXA PH100

S1 S2S3S4

SET/ENT key rewrites data

EXA PH100

S1S2S3

SET/ENT key rewrites data

EXA PH100

S1S2S3

SET/ENT key rewrites data

EXA PH100

S1S2S3

SET/ENT key rewrites data

EXA PH100

S1 S2S3S4

SET/ENT key rewrites data

EXA PH100

S1S2S3

SET/ENT key rewrites data

EXA PH100

S1S2S3

SET/ENT key rewrites data

EXA PH100

S1 S2S3S4

SET/ENT key rewrites data

Change value with m and . keys

S3 delay time

S4 hysteresis

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1 S2S3S4

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1 S2S3S4

SET/ENT key

Change value with m and . keys

EXA PH100

S1S2S3

SET/ENT key

Change value with m and . keys

EXA PH100

S1 S2S3S4

SET/ENT key

S4 delay time

High limit alarm

Low limit alarm

High high limit alarm

Low low limit alarm

EXA PH100

S1S2S3

EXA PH100

S1S2S3

EXA PH100

S1 S2S3S4

EXA PH100

S1S2S3

EXA PH100

S1 S2S3S4

EXA PH100

S1S2S3

EXA PH100

S1 S2S3S4

EXA PH100

S1 S2S3S4

SET/ENT key rewrites data

IM 12B11A01-01E

F5.3.EPS

Fig. 5.3 Example flow chart for setting alarm parameters when four contacts output specified

Note: To cancel, press both ( ) and ( ) simultaneously.

5-7

(4) Other parameter setting screen (otHr displayed at top of screen)

This screen is for user setting of parameters for other measurements. A list of menu options on this screen is shown below

Table 5.4

Name Parameter Setting range Initial value Note

otHr dsP.t

UnIt

t.SnS

SEL.t

SEt.t

t.CAl

Menu Title temperature in display

Temperature unit

RTD type

temperature compensation

temperature setting

temperature calibration (1-point calibration)

NA (not applicable) NA 0: OFF

1: ON 0: 8C

1: 8F 0: Pt1000

1: Other 0: automatic (temperature sensor)

1: manual (setting)

-10.0~110.08C (14.0~230.08F)

-15.0~115.08C (5.0~239.08F)

0: OFF

0: 8C

0: Pt1000 0: automatic (temperature sensor)

25.08C (77.08F)

For reference. temperature is displayed when this parameteris displayed. The temperature is not updated automatically

Other depends on the suffix code

Effective when

SEL.t is 1

Please input the actual temperature of the measurement liquid Effective when SEL.t is 0.

d.InS

InSP menu display fliag setting

0: no display 1: display

0: no display Alwaus set 0

When the power is turned off, the setting become

T5.4.EPS

5-8

IM 12B11A01-01E

EXA PH100

S1S2S3

SET CAL MEAS ENT

CANCEL

Measurement screen

5. Operation

Example flow chart for setting other measurement parameters is shown below

Press m key for 3 sec.

Press . key for 3 times

S1S2S3

Temperature display setting

Temperature unit setting

Temperature RTD type setting

EXA PH100

SET/ENT key

PH100EXA

S4S3S2

SET/ENT key

PH100EXA

S4S3S2

SET/ENT key

PH100EXA

S4S3S2

SET/ENT key

Press SET/ENT for 3 sec.

Ao.PA flashing

Press m key for 3 times.

otHr flashing

Other parameter setting screen

Change value with m and . keys

PH100EXA

S4S3S2

SET/ENT key rewrites data

Temperature

compensation

PH100EXA

S4S3S2

SET/ENT key rewrites data

Temperature setting

PH100EXA

S4S3S2

SET/ENT key rewrites data

Temperature calibration

InSP menu dispisplay on/off Flag setting

PH100EXA

S4S3S2

SET/ENT key

Change value with m and . keys

PH100EXA

S4S3S2

SET/ENT key

Change value with m and . keys

PH100EXA

S4S3S2

SET/ENT key

Change value with m and . keys

PH100EXA

S4S3S2

PH100EXA

S4S3S2

SET/ENT key rewrites data

PH100EXA

S4S3S2

SET/ENT key rewrites data

PH100EXA

S4S3S2

SET/ENT key rewrites data

PH100EXA

S4S3S2

SET/ENT key

SET/ENT key rewrites data

IM 12B11A01-01E

F5.4.EPS

Fig. 5.4 Example flow chart for setting other measurement parameters

Note: To cancel, press both ( ) and ( ) simultaneously.

5-9

5.1.4 Temperature Calibration

The EXA PH100 PH converter is used with a pH sensor, and the resistance of the cabling between them will vary depending on the length of the cable. When Yokogawa’s PH10FP or PH10RP are used, the cable length is selectable – it may be any of 3 m, 5 m, or 10 m. When the WTB100 intermediate terminal box is used with the special WF100 extension cable, the cable length may be increased up to 50 m. For accurate temperature compensation, one time temperature calibration (to compensate for the resistance of the cable between converter and detector) after installation is recom- mended.

Procedure for Temperature Compensation

Temperature compensation should be performed with the measured solution as near as possible to the normal temperature of measurement. To minimize temperature change during measurement, you should prepare at least 4 liters of solution. You also need a thermometer to measure the temperature of the solution. Temperature calibration uses the t.CL (Temperature Calibration) setting screen described in Section 5.1.3 (4) Other Parameters.

The pH detector (immersed up to the liquid junction) and thermometer should be placed in the solution to be used for temperature calibration. For best accuracy, leave the detector until its temperature has stabilized (this usually takes about two minutes) before reading the thermometer, setting that temperature into the conductivity converter, and calibrating.

Temperature calibration can be performed in the range -15˚C to +115˚C, and the compensation value (pH detector measured temperature minus thermometer measured temperature) should be within the range -20˚C to +5˚C.

5.1.5 Calibration with Standard Liquid

The emf of the glass electrode varies a little between electrodes. Before stareting normal operation, calibrate with standard solution.

The emf of the electrode will also vary if it gets dirty or as the electrode ages, so recalibration needs to be performed periodically at frequent enough intervals to keep error within rated tolerance.

The procedure for calibration with standard liquid is described in Sec. 6.

5-10

IM 12B11A01-01E

5.2 Test Operation

To check if operation of the EXA PH100 pH converter is normal, monitor it in test operation mode for a while.

5.3 Normal operation

From the parameter setting screen, press the ( ) key for at least 3 seconds to return to the measurement screen.

Apart from when changing settings or calibrating with standard solution, during normal operation there should be no need for operating this machine. If an error message is displayed or the output scales out, refer to Sec. 8 for troubleshooting. please make the cause be clear by following the on and treat immediately. Also, please be sure to perform the daily checks and maintenance described in Sec. 7 in order to maintain reliable operation.

5.4 Stopping and Restarting Operation

5. Operation

After changing settings, be sure to wait at least 2 seconds before turning off the power. In other cases, no special precautions are required.

To stop operation, simply turn off the power supply. To restart operation, simply restore power and parameter values remain the same as

before the power failed.

IM 12B11A01-01E

5-11

5-12

IM 12B11A01-01E

6. Calibration with standard solution

The emf characteristics of pH electrodes vary between electrodes, and vary with electrode aging The variability of pH detectors that are used only for short periods can be particularly high. The variability of pH detectors that are used only occasionally for short periods can be particularly high. So there is a need for electronic circuitry to perform automatic compensation of pH.

Calibration with standard solution involves measuring the pH of standard solution of known pH, and adjusting the pH meter to show the correct pH value.

Calibration with standard solution of the EXA PH100 pH converter can be either automatic calibration using standard solutions of two predetermined pH values chosen from pH 4, 7, and 9 (JIS), and manual calibration using arbitrary standard solution.

6.1 Important issues relating to calibration with standard solution

Standard solution/ temperature 8C

pH4 pH7 pH9

(1) Be careful to use the standard solution marked with the correct pH.

If the pH standard solution has deteriorated and its pH changed, calibration will not be accurate.

Note: when automatic calibration is used, choose two standard solutions from those

(pH4, pH7and pH9) shown in Table 6.1.

(2) If the temperature of the standard solution is changing, the measured pH value will

not stabilize. At calibration time, keep the standard solution at constant temperature.

(3) During auto calibration, do not touch ENT or ( ), ( ) keys as calibration values

may be affected.

Table 6.1 JIS Z8802 standard solution

0 5 10 15 20 25 30 35 40 45 50 55 60 70 80 90 95

4.01

4.00

4.01

4.02

4.03

4.04

4.06

4.08

4.10

4.12

4.16

4.20

6.98

6.95

6.92

6.90

6.88

6.86

6.85

6.84

6.83

6.84

6.85

6.86

6.88

9.46

9.39

9.33

9.27

9.22

9.18

9.14

9.10

9.07

9.04

9.01

8.99

8.96

8.93

8.89

8.85

4.23

6.89

8.83

T6.1.EPS

IM 12B11A01-01E

6-1

6.2 Calculations involved in Calibration with Standard Solution

(1) When performing auto one-point calibration of the EXA PH100 pH converter using

one type of standard solution, use one of the standard solutions (pH4, pH7 or pH9) and adjust the asymmetry potential so that the calibration curve passes through the calibration point (see Fig. 6.1).

Calibration curve

pH0

Calibration point for one-point calibration at pH7

Calibration curve

+mV

-mV

Theoretical value

pH7, 0mV

pH14

Asymmetry potential

Calibration point for one-point calibration at pH4

pH0

+mV

-mV

Theoretical value

pH7, 0mV

pH14

Asymmetry potential

Fig. 6.1

*) When you measure the pH of solutions that have nearly the same pH as a standard solution, you can use auto one-point calibration, a simple method of calibration that gives sufficient accuracy in this case.

2) When using two kinds of standard solution for two-point automatic calibration of the EXA PH100 pH converter, choose two standard solutions pH4, pH7 or pH9 and adjust the asymmetry potential and slope so that the calibration curve passes through the first and second calibration points (Fig. 6.2) Second calibration point (pH4)

F6.1.EPS

Second calibration point (pH4)

pH0

First calibration point (pH7)

Fig. 6.2

+mV

-mV

Theoretical value

pH7, 0mV

pH14

Asymmetry potential

Calibration curve (slope)

F6.2.EPS

6-2

IM 12B11A01-01E

6. Calibration with standard solution

3) When using one kind of standard solution for manual calibration of the EXA PH100 pH converter, choose any of the standard solutions and draw the calibration curve through the calibration point (Fig. 6.3).

calibration curve

+mV

Theoretical value

pH7, 0mV

Theoretical value calibration point when using arbitrary standard liquid

Fig. 6.3

CAUTION

Calibration point represents the electrode emf corresponding to the pH value of the standard solution used.

pH0

-mV

pH14

Asymmetry potential

F6.3.EPS

IM 12B11A01-01E

6-3

4) When using two kinds of standard solution for manual calibration of the EXA PH100 pH converter, choose two arbitrary standard solutions and adjust the asymmetry potential and slope so that the calibration chart passes through the first and second calibration points (Fig. 6.4)

CAUTION

It will need more than a pH difference of at least 2 between pH values of the two kinds of standard solution.

Second calibration point

+mV

Theoretical value

pH7, 0mV

pH0

Fig. 6.4

pH14

asymmetry potential

first calibration point

-mV

calibration curve (slope)

F6.4.eps

6-4

IM 12B11A01-01E

6.3 Preparation

(1) Selection the calibration method

* On the calibration parameter setting screen, select the calibration method: automatic

calibration or manual calibration.

* On the calibration parameter setting screen, select one-point calibration or two-point

calibration. Usually, we recommend two-point calibration.

1) Two-point calibration Select combination of standard solutions from the following: * pH7 and pH4

pH9 (pH10*) and pH7 pH9 (pH10*) and pH4

*: if US technical standard solution table selected.

2) One-point calibration Select standard solution from the following:

pH7 pH4

pH9 (pH10*) *: if US technical standard solution table selected * On the calibration parameter setting screen, select the kind of standard solution

calibration table from JIS • NIST standard solution table, US technical standard table,

or DIN standard solution table.

6. Calibration with standard solution

IM 12B11A01-01E

6-5

Press m key for 3 sec.

Example flow chart for setting of auto calibration (two-point calibration) at pH9 and pH7, using JIS standard calibration table.

PH100EXA

S4S3S2

ENT

Measurement screen

PH100EXA

S4S3S2

CANCEL

MEASCALSET

Press SET/ENT for 3 sec.

Ao.PA flashing

m key key

EXA PH100

S1S2S3

Calibreation screen

Calibration method setting

S4S3S2

Calibration points

CAL flashing

SET/ENT key

PH100EXA

Meaning of the parameter Auto calibration: 0 (initial value)

Manual calibration: 1

SET/ENT key

PH100EXA

*Meaning of the parameter One-point calibration: 0

Two-point calibration: 1(initial value)

Change value with m and . keys

PH100EXA

S4S3S2

Two-point calibration with standard solution

SET/ENT key rewrites data

PH100EXA

One-point calibration with standard solution

S4S3S2

Note: only applies for one-point calibration, so can leave as is.

PH100EXA

*Meaning of the parameter pH7 and pH4: 0 (initial value)

pH9 and pH7: 1 <- chande to this setting

S4S3S2

pH9 and pH4: 2

6-6

SET/ENT key

Fig. 6.5

Standard solution calibration table type

PH100EXA

*Meaning of the parameter JIS: 0 (initial value)

DIN: 1

S4S3S2

US: 2

F6.5.EPS

IM 12B11A01-01E

(2) Preparation for auto calibration

* For two-point calibration, select two types of standard solution from among pH4, pH7

and pH9.

CAUTION

In the US, select two from among pH4, pH7, and pH10.

* For one point calibration, select one type of standard solution from among pH4, pH7

and pH9.

CAUTION

In the US, select one from among pH4, pH7, and pH10.

* Prepare two clean containers of size about 200ml, and water (e.g. pure water) for

washing the pH electrode.

6. Calibration with standard solution

(3) Preparation for manual calibration

* For two-point calibration, select any two of the pH standard solutions. But the two

selected need to differ in pH by at least pH2. * For one-point calibration, use any one of the pH standard solutions.

Prepare two clean containers of size about 200ml, and water (e.g. pure water) for

washing the pH electrode.

CAUTION

When manual temperature compensation is to be performed, provide a thermometer for measuring the temperature of the standard solutions.

IM 12B11A01-01E

6-7

6.4 Auto calibration with standard solution

6.4.1 Setting parameters for auto calibration

Set parameter for auto calibration as per Fig. 5.2, before starting auto calibration.

6.4.2 Procedure for auto calibration

This section describes, as an example, two-point auto calibration using standard liquids of pH7 and pH4.

1) On the measurement screen, press ( ) key for 3 seconds to switch to the auto calibration screen. Measured value display shows current measured value. For example: “6.86” Auxiliary display shows “A.CAL”.

2) Wash the pH electrode thoroughly with pure water.

3) Dip the detector head in the first standard solution.

4) Press SET/ENT key. Auxiliary display: displays types of standard solutions that are set at present, e.g. "4-7".

5) Press SET/ENT key. The auxiliary display will show “CAL7” blinking quickly.

(meaning “beginning pH7 calibration). *note: you can select the other standard solution first (e.g.: CAL4) by pressing ( ) key, then second solution will be pH7.

6) press SET/ENT key after selecting the standard solution pH to be measured.

7) if “temperature compensation” setting is “manual” then manually measure and set the measured temperature of the standard solution. The measurement display shows measured temperature. The auxiliary display shows “25C” (18C unit), and the least significant digit blinks. For manual temperature compensation, set the temperature on the auxiliary display with ( ) and ( ) keys.

8) When you press the SET/ENT key, the measurement display value blinks. The auxiliary display shows “CAL7”.

9) The converter waits until the measured electrode emf, representing the pH value, stabilizes, performs temperature compensation and calibrates the first pH value. The blinking of the measurement display value stops. ”Ent7” is displayed, blinking, in the auxiliary display.

*Note: if you want to repeat calibration with the same standard solution, press ( ) and

( ) keys at the same time (for “cancel”).

10) Press SET/ENT key. The results of calibration at the first calibration point are displayed.

*Note: until you have finished the calibration (both points, in this case), calibration

results are not reflected in any measurement values.

11) Auxiliary display shows “CAL4”, blinking. (meaning “start pH4 calibration”) PH value of standard solution to be clibrated will be display due to setted parameter.

12) wash the pH electrode thoroughly with pure water and dip the detector into the second standard solution.

13) Press SET/ENT key For manual temperature compensation (manually set temperature), set the temperature of the standard solution. Measured value display shows the measured value. Auxiliary display shows the temperature (in 18C units) used for first calibration point, with the least significant digit blinking.

14) Use ( ) and ( ) keys to set the temperature on the auxiliary display.

15) Pressing SET/ENT key causes the measurement value on the measurement to blink. The Auxiliary display shows “CAL4”.

6-8

IM 12B11A01-01E

Measurement screen

Press m key for 3 sec.

SET/ENT key Temperature compensation by

Temperature sensor

16) The converter waits until the measured electrode emf, representing the pH value, stabilizes, performs temperature compensation and calibrates the first pH value. Measurement value on measurement display stops blinking. “Ent4” blinks on Auxiliary display.

Note: if you want to repeat calibration with the same standard solution, press ( ) and

( ) keys at the same time (for “cancel”).

17) Press SET/ENT again to start the calibration calculation. If the calibration results are normal, the auxiliary display shows “Good” (blinking). If results are abnormal, the auxiliary display shows an error code.

18) Pressing SET/ENT key again reverts to original “ACAL” display. If data is abnormal then the calibration data is updated.

19) To revert the detector to online measurement of the process, press ( ) key for at least 3 seconds, and the measurement screen reappears.

PH100EXA

S4S3S2

CANCEL

MEASCALSET

ENT

To EXA OH100

Press . key for 3 sec.

PH100EXA

S4S3S2

SET/ENT key

EXA PH100

S1 S2S3S4

SET/ENT key

You can select pH4 with m key

EXA PH100

S1S2S3

Temperature compensation user setting

EXA PH100

Converter judges the

stability of the emf

S1 S2S3S4

Afer temperature compensation, calibrates pH

Thermoneter Provide thermoneter when temperature compen sation is user setting

You can select pH7 with . key

pH electrode Wash thoroughly before placing in standard soln.

EXA PH100

S1S2S3

EXA PH100

S1S2S3

Enter reading of thermometer in standard solution using m or . keys

EXA PH100

S1 S2S3S4

SET/ENT key

pH7 standard solution.

SET/ENT key Temperature compensation by

Temperature sensor

6. Calibration with standard solution

EXA PH100 Thermometer Provide thermometer

EXA PH100

S1S2S3

Temperature compensation

user setting

EXA PH100

S1S2S3

After temperature compensation, calibrates pH

EXA PH100

S1S2S3

SET/ENT key

EXA PH100

S1S2S3

SET/ENT key Press m and . keys together to repeat this calibration step

when temperature compensation is user setting

Measurement value blinking stops Auxiliary display blinks

EXA PH100

S1S2S3

Enter reading of thermometer in standard solution using m or . keys

EXA PH100

S1S2S3

Converter judges the stability of the emf

Measurement value blinking stops

Auxiliary display blinks

Second calibration point result stored in the converter

SET/ENT key

pH electrode Wash thoroughly before placing in standard soln.

pH4 standard solution.

EXA PH100

S1S2S3

IM 12B11A01-01E

First calibration point result stored in the converter Measurement value blinking stops Auxiliary display blinks

SET/ENT key

Pressing m and . key together reverts to the top screen

Fig. 6.6 Two-point auto calibration using standard solution of pH7 and pH4

PH100EXA

S4S3S2

Press m key for 3 sec. to revert to process measurement

PH100EXA

S4S3S2

CANCEL

MEASCALSET

ENT

Measurement screen

F6.6.EPS

6-9

Here we describe an example of one-point auto calibration method using a standard solution of pH7

1) On the Measurement screen, press the ( ) key for three seconds to switch to the autocalibration screen. The current measurement value is displayed, for example 6.86 The Auxiliary display changes to “A.CAL”

2) Clean the pH electrode with an adequate amount of pure water.

3) Dip the sensor in standard solution.

4) Press the SET/ENT key. The Auxiliary display shows pH of the standard liquid to be used for calibration, e.g. “7”.

5) Press the SET/ENT key. The Auxiliary display shows “CAL7” blinking, meaning “started pH 7 calibration”.

6) Check that the correct standard solution is being used, then press the SET/ENT key. The measured pH value is displayed, and if temperature compensation is set to Manual (user entry) you then need to set the standard solution temperature: the Auxiliary display shows 25°C with the 5 blinking; you can change this setting using the ( ) keys.

7) Press the SET/ENT key, and the measured value is displayed, flashing. The Auxiliary display shows “CAL7”.

8) The converter waits until the measured electrode emf, representing the pH value, stabilizes, performs temperature compensation and calibrates the first pH value. The blinking of the measurement display value stops. ”Ent7” is displayed, blinking, in the auxiliary display.

*Note: if you want to repeat calibration with the same standard solution, press ( ) and

( ) keys at the same time (for “cancel”).

9) Press the SET/ENT key again. The calibration (correction) calculation is performed; if normal, then “Good” is displayed, blinking, on the Auxiliary display. If there is any abnormality, then an error code is displayed. For details of the meaning of error codes, see Sec. 8.2.

10) Press the SET/ENT key again to update the calibration data. (If there is any abnormality, the data won’t be updated).

11) To return the sensor to online process measurement, press the ( ) key for at least 3 sec. to return to the measurement screen.

6-10

IM 12B11A01-01E

6. Calibration with standard solution

Measurement screen

m key

Press for 3 sec.

SET/ENT key

Temperature compensation by

Temperature sensor

EXA PH100

CANCEL

Press . key for 3 sec.

S1S2S3

SET CAL MEAS ENT

S1S2S3

SET/ENT key

PH100EXA

S4S3S2

SET/ENT key

PH100EXA

S4S3S2

Temperature compensation user setting

To EXA PH100

Thermometer Provide thermometer

PH100EXA

S4S3S2

reading of thermometer in standard solution using

m or . keys

PH100EXA

S4S3S2

SET/ENT key

pH electrode Wash thoroughly

pH7 standard solution.

PH100EXA

S4S3S2

After temperature compensation, calibrates pH

PH100EXA

S4S3S2

SET/ENT key

PH100EXA

S4S3S2

SET/ENT key

S1S2S3

SET CAL MEAS ENT

Measurement screen

m key

Press for 3 sec.

S1S2S3

Converter judges the stability of

the emf

Measurement value blinking

stops Auxiliary display blinks

Second calibration

point result stored in the converter

EXA PH100

CANCEL

IM 12B11A01-01E

Pressing m and . key together reverts to the top screen

Fig. 6.7 One-point auto calibration using standard solution pH7

F6.7.EPS

6-11

6.5 Manual Calibration with Standard Solution

6.5.1 Manual Calibration Parameter Settings

Before starting calibration, set the parameters relating to manual calibration.

6.5.2 Procedure for Manual Calibration

1) On the measurement screen, press ( ) key for 3 seconds to switch to manual calibration screen “M.CAL” is shown on the auxiliary display

2) Wash the pH electrode in pure water

3) Dip the detector in the standard solution (arbitrarily-selected) for the first calibration point.

4) Press SET/ENT key “CAL1” on the auxiliary display blinks. ( meaning “beginning first point calibration)

5) Press SET/ENT key. If temperature compensation is set to Manual (user entry) you then need to set the standard solution temperature: the Auxiliary display shows 25°C with the 5 blinking; you can change this setting using the ( ) keys.

6) Press the SET/ENT key, and the measured value is displayed, flashing. The Auxiliary display shows “CAL1”.

7) Wait for the reading to stabilize, then press the SET/ENT key. The first digit of the measured value blinks, and the Auxiliary display shows the temperature.

8) Press the ( ) keys to adjust the displayed pH to the value after temperature compensation.

9) Press the SET/ENT key again to update the calibration data. The measured value blinking stops, and the Auxiliary display shows “Ent1” blinking. Note: To repeat the measurement and calibration at this point, press ( ) keys simultaneously.

10) Press SET/ENT key. The results of calibration at the first calibration point are displayed.

*Note: until you have finished the calibration (both points, in this case), calibration

results are not reflected in any measurement values. Auxiliary display shows “CAL2”, blinking (meaning “start 2nd point calibration”)

The (measured) pH of the standard solution is displayed.

11) Wash the pH electrode thoroughly with pure water and dip the detector into the second standard solution.

12) Arbitrarily select the standard solution to be used for 2nd point calibration.

14) Use ( ) keys to set the temperature on the auxiliary display.

15) Pressing SET/ENT key causes the measurement value on the measurement to blink. The Auxiliary display shows “CAL2”.

16) Waits for the measured pH value to stabilize, then press the SET/ENT key. The first digit of the measured value blinks, and the Auxiliary display shows the temperature.

17) Press the ( ) keys to adjust the displayed pH to the value after temperature compensation.

6-12

IM 12B11A01-01E

6. Calibration with standard solution

18) Press the SET/ENT key again to update the calibration data. The measured value blinking stops, and the Auxiliary display shows “Ent2” blinking. Note: To repeat the measurement and calibration at this point, press ( ) keys simultaneously.

19) Press SET/ENT key. If calibration results were normal, then “Good” (blinking) is displayed on the Auxiliary display. If results are abnormal, the auxiliary display shows an error code. For details of the meaning of error codes, see Sec. 8.2.

20) Press the SET/ENT key again to update the calibration data. The “M.CAL” display in 1) above reappears. If data is abnormal then the calibration data is not updated.

21) To revert the detector to online measurement of the process, press ( ) key for at least 3 seconds, and the measurement screen reappears.

IM 12B11A01-01E

6-13

6.6 Canceling Calibration

To cancel calibration

1) Press ( ) keys simultaneously several times until you revert to the top calibration screen (Auxiliary display shows A.CAL or M. CAL).

2) To revert to measurement of the process, press ( ) key for at least 3 sec. to revert to the measurement screen.

6.7 Error during Calibration

If slope is outside the range 70% to 110% or asymmetry potential is outside the range –120 mV to 120 mV then a calibration error results. The measured display is displayed

but the Auxiliary display shows a blinking error code. No updating is performed in the case of such an error. For details of error codes, refer to Sec. 8.2.

CAUTION

If an error occurs, the only key entry that is accepted on either Autocalibration screen or Manual calibration screen is to press ( ) keys simultaneously to abort calibration.

6.7.1 Recovering from an Error

To repeat calibration:

1) Press ( ) keys simultaneously several times to revert to top calibration screen.

2) Press SET/ENT key and repeat calibration procedure from beginning.

6.7.2 Quitting calibration

1) Press ( ) keys simultaneously several times to revert to top calibration screen.

2) Press ( ) key for at least 3 sec. to revert to Measurement mode.

CAUTION

Replace the sensor in the process before operate keys.

6-14

IM 12B11A01-01E

7. Maintenance and Cleaning

7.1 Periodic Maintenance

7.1.1 Electrode cleaning

When the glass electrode and liquid junction of the pH sensor become dirty, the measured value may become unstable or drift and response may become very slow. Clean the electrode periodically,

CAUTION

For details of the procedure for washing the pH electrode, refer to the instruction manual for the sensor you are using.

7.1.2 Calibration with Standard Liquid

7. Maintenance and Cleaning

The emf of a sensor electrode changes as the electrode ages. Dirt adhering to the electrode will also affect the electrode emf. Since this will otherwise cause measurement errors, you should recalibrate the sensor periodically. You might start by calibrating it weekly and recording the data, and using this data as a basis for determining the optimum calibration interval. Refer to Sec. 6 for the calibration procedure.

7.1.3 Checking the KCl in the Detector

If you use a refillable sensor, you should periodically top up the KCl.

CAUTION

For the procedure for topping up the sensor, refer to the instruction manual for the sensor you are using.

IM 12B11A01-01E

7-1

7.2 Preventative Maintenance

7.2.1 PH Converter Terminal Isolation

There needs to be a high resistance between the input terminals of the pH converter. Check the converter terminals once or twice a year to confirm that they are not dirty, and have not been affected by condensation or frost.

7.2.2 Check the Display of the pH Converter

Use soft cloth or tissue paper to clean off any dirt on the display of the EXA PH100 pH converter. If required, you may use neutral detergent to remove dirt – but avoid using organiz solvents.

7-2

IM 12B11A01-01E

8. T r oubleshooting

8. T roubleshooting

8.1 Unexpected value displayed (narrowing down problem to converter or sensor)

CAUTION

If you request Yokogawa to narrow down the problem to converter or sensor as follows then expenses such as travel to site will be incurred.

A. If you think the displayed value is incorrect

STEP 1.

• Check the KCl level in the sensor (1) For PH10FP: If low, top up with KCl (2) For PH10RP: See STEP 2 below

STEP 2.

• Check if sensor electrode is dirty. If dirty, clean the electrode as follows: (1) Remove protective cover on tip of sensor

(2) Use clean water to wash glass electrode, reference electrode, and junction. (3) If the stains don’t wash off, use cotton wadding (4) Chemical (metallic) stains may be removed by dipping for several minutes in dilute

hydrochloric then washing.

(5) If stains on the ceramic junction do no wash off, you may clean the surface with

sandpaper.

water

Use cotton wad

Temperature sensor

Glass electrode

Dilute hydrochloric acid

After a few minutes

Wash in water STEP

IM 12B11A01-01E

8-1

STEP 3.

• Use standard solution or special solution and calibrate Case 1: If calibration ends normally but displayed value is still abnormal, then electrode

life is over.

Case 2: If there are no errors but calibration does not end normally, refer to B. Below. Case 3: If there are calibration-time errors, refer to C. Below.

B. If you think calibration is not being performed normally

(1) Use a new batch of (standard) calibration solution. (2) Perform Step 1 and Step 2 in A above. (3) If things don’t proceed normally even if calibration is repeated.

The electrode life is over. Get a new one.

If there are calibration-time errors: Follow the procedure shown in the flow chart below. Refer to Sec. 8.2 for error details.

If any of standard calibration errors C-01, C-02, C-03 or C-04 occur

Has standard solution deteriorated?

Is electrode dirty?

Has glass electrode dried out?

Has KCl in sensor run out

Bubbles inside tip of electrode?

YES

Prepare a new batch of standard solution

Clean electrode as per Sec. 8.1 Step 2

Rehydrate glass electrode. (Note) Leave about 12 hours in

YES

standard soln.

Refill electrode with KCl. (Note) When using PH10RP KCl replenish-free type sensor, replace sensor.

Swish electrode in solution to dislodge bubbles

8-2

Electrode life is over. Replace sensor

Note 1: Refer to sensor IM 12B11C0h-01E for sensor replacement procedure.

IM 12B11A01-01E

C. If there are measurement-time errors

Follow the procedure shown in the flow chart below. Refer to Sec. 8.2 for error details.

If any of measurement errors E-01, E-02, E-03 or E-04 occur.

8. T r oubleshooting

Is electrode dirty?

Wrong cable connection?

Temperature detector wiring broken or short circuited

Has KCl in sensor run out

Electrode life is over. Replace detector.

YES

Clean electrode as per Sec. 8.1 Step 2

Refer to Sec. 3 for wiring details

Replace detector

YES

Refill electrode with KCl. (Note) When using PH10RP KCl replenish-free type sensor, replace sensor.

(Note 1) Refer to sensor IM 12B11C0h-01E for sensor replacement procedure.

D. If replacing sensor does not return things to normal

• It must be a converter abnormality

CAUTION

For a new pH electrode, the error code E-01 may be displayed. This does not indicate a defective sensor; the electrode may need to be soaked in water for a day before it is ready for use.

E. When error E-04 occurs

• Converter is abnormal. Cycle power OFF then ON again, and if the problem persists

then send it in for servicing.

CAUTION

If you request Yokogawa to remove or replace the converter then expenses such as travel to site will be incurred.

IM 12B11A01-01E

8-3

8.2 Error Display

If any abnormality is detected in the EXA PH100 pH converter, a blinking error code is displayed. FAIL contact output may also be set, and any pH converter abnormality is also displayed. If analog output hold is set then burnout downscale (2 mA). The meaning of the different error numbers is as follows:

Table 8.1

Error no.

Table 8.2

Error no. Aux. display Error detail

Aux. display Error detail

1 2 3 4

1 2

3 4

E-01 E-02

E-03 E-04

C-01 C-02

C-03 C-04

pH measurement out of range Temperature measurement out of range Temperature detector abnormal Converter abnormal

T8.1E.eps

Standard solution temperature out of range Asymmetry potential abnormal

Sensor emf characteristic slope abnormal Sensor reading unstable

T8.2E.eps

Details of error codes are described below.

8.3 Fixing Error Status

The action you should take when a particular error code is displayed is described below. The error code will not go away unless the error condition is fixed.

8.3.1 Error 1 pH Measurement Out of Range

Aux. display: E-01

[ Cause ] The pH measurement is outside the range -2 to 16.

[ Cure ]

* Check connection between pH sensor and converter * Check the insulation of the cable terminals, and check for corrosion of the electrode. * If there is corrosion of the electrode , replace the sensor.

8.3.2 Error 2 Temperature Measurement Out of Range

Aux. display: E-02

8-4

[ Cause ] The temperature measurement is outside the range –15 to 115°C.

[ Cure ]

* Make sure that the measurement liquid is within the above temperature range.(-10 to

1108C)

* Check the connection between the sensor and converter. * If the measurement liquid is within the above temperature range but this error occurs,

then the temperature sensor is bad and the pH sensor should be replaced.

IM 12B11A01-01E

8.3.3 Error 3 Temperature Sensor Abnormal

Aux. display: E-03

Note that if the wiring is broken then E-02 is displayed. The display alternates between E-02 and E-03.

[ Cause ] May occur if sensor used and converter sensor setting do not agree.

[ Cure ]

* Remove temperature sensor from measured liquid, so that it is at room temperature;

disconnect cable from converter and measure resistance between terminals of RTD

sensor. Check the resistance against that indicated in table 8.3 to check if it’s normal. * Check that sensor setting in converter agrees with actual temperature sensor used. * If connections of pH sensor are normal but reading is still abnormal, the temperature

sensor in the pH sensor is probably bad. Replace the pH sensor.

Table 8.3 Resistance of temperature sensor at 25°C

Temperature sensor

Pt1000 Pt100

500V 10kV

6.8kV

Resistance

Approx. 1100V Approx. 110V Approx. 500V Approx. 10kV Approx. 6.8kV

T8.3.EPS

8. T r oubleshooting

8.3.4 Converter Abnormal

Aux. display: E-04

[ Cause ] Converter problem.

[ Cure ] Turn power OFF then ON again. If this doesn’t cure the problem, have Yokogawa service the converter.

8.3.5 Calibration Error

Aux. display: C-01

[ Cause ] Temperature of standard solution used for autocalibration is out of range.

For JIS or NIST table, permitted range is 0 to 95°C. For DIN 19267, permitted range is 0 to 90°C. For US Technical Buffer Table, permitted range is 0 to 60°C. For manual calibration, permitted range is -10°C to 110°C.

[ Cure ] Make sure that standard solution is within appropriate temperature range above.

IM 12B11A01-01E

8-5

8.3.6 Asymmetry Potential Abnormal

Aux. display: C-02

[ Cause ] For one-point or two-point calibration, the asymmetry potential is checked and if it is outside the range +/-2pH (+/-120mV) then this alarm occurs.

[ Cure ]

* Check if sensor is dirty, clean the electrode if it is. * Check that correct standard solution is being used for calibration. * If performing calibration manually, maybe a wrong value was entered. Try

recalibration. * If the above steps do not cure the problem, the sensor is probably at the end of its life,

replace it.

8.3.7 Abnormal Slope of sensor emf characteristic

Aux. display: C-03

[ Cause ] For two-point calibration, the slope of the sensor characteristic is checked to confirm that it is between 70% and 110%.

[ Cure ]

recalibration. * If the above steps do not cure the problem, the sensor is probably at the end of its life,

replace it.

8.3.8 Unstable Sensor Reading

Aux. display: C-04

[ Cause ] The sensor reading failed to stabilize within five minutes.

[ Cure]

* Check if sensor is dirty, clean the electrode if it is. * If the above step does not cure the problem, the sensor is probably at the end of its

life, replace it.

8-6

IM 12B11A01-01E

Revision Record

Manual Title : Model PH100 Panel Mount pH Converter Manual Number : IM 12B11A01-01E

Edition Date Remark (s)

1st Apr. 2003 Newly published

Yokogawa PH100 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual