Yokogawa FU20-PH20 User Manual

IM 12B6J3-E-H

5th edition

Instruction Manual

Model PH20 & FU20 pH/ORP Combination sensor

YOKOGAWA

IM 12B6J3-E-H

TABLE OF CONTENTS

1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1-1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1-2. Unpacking and Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1-3. Warranty and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2. General Specifications PH20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-1. Measuring elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-2. Construction materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-3. Functional specifications (at 25°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-4. Dynamic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2-5. Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

3. Installation Site PH20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3-1. Installation Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3-2. Preparing the Sensor for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3-3. Mounting the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

4. General Specifications FU20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4-1. Measuring elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4-2. Construction materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4-3. Functional specifications (at 25°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4-4. Dynamic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4-5. Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5. Installation Site FU20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5-1. Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5-2. Preparing the Sensor for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5-3. Mounting the Sensor into the Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

6. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

6-1. Conventional pH (& ORP) Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

6-2. Wiring for ORP measurement with normal reference . . . . . . . . . . . . . . . . . . . . . . .12

6-3. Wiring for ORP measurement with pH reference . . . . . . . . . . . . . . . . . . . . . . . . . .12

7. General Calibration & Maintenance Procedure . . . . . . . . . . . . . . . . . . . . . . . . .13

7-1. Calibration for pH measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

7-2. Calibration for ORP measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

7-3. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

8. Model Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

9. Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

IM 12B6J3-E-H

1. GENERAL

1-1. INTRODUCTION

This instruction manual provides information for the installation and use of the FU20 and PH20, four-in-one wide body pH sensors. While both sensors can be used in a variety of applications, in general, the FU20 is the choice for the majority of typical wastewater and process applications. The PH20 with its patented "compensation panels", is selected when more aggressive chemicals (PVDF body) or varying process temperatures and pressures are present.

The Model PH20 is patented design, provides continuous compensation for temperature and pressure changes in the process resulting in an extremely accurate and stable measurement. With this one sensor, pH, redox (ORP) and temperature can be measured simultaneously. The PH20 can be easily installed using a variety of adapters in Stainless Steel or PVDF. You can choose from a common 3/4" or 1" NPT threaded connection or select the optional (/SF4) stainless adapter that allows the use of Yokogawa’s FF40, FS40 or FD40 sensor holders. The Model FU20 offers a simple and cost effective solution for a wide variety of wastewater and process applications. This all-inone sensor provides simultaneous measurement of pH, redox (ORP) and temperature if desired. The rugged Ryton body is designed for easy installation into on-line and immersion applications via the 3/4" NPT threaded connections provided on both ends of the sensor. Optional quick-removal adapters in both stainless steel and titanium are available to make calibration and maintenance even easier.

Both the PH20 and FU20 include an integral cable of optional lengths designed to minimize the adverse affects of noise can have on the measurement. This cable is pre-finished to make connection to any industrial pH instrument as simple as possible.

1-2. Unpacking and Checking

Upon delivery, unpack the sensor carefully and inspect it to ensure it was not damaged during shipment. If damage is found, retain

the original packing materials (including outer box) and then immediately notify the carrier and the relevant Yokogawa sales office. Make sure the Model Code on the sensor is the same as on the packing list. Also, check any option(s) that were ordered are included and correct. The PH20 sensor has an identification number on the cable with the full Model Code and a Serial Number included

1-3. Warranty 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 the manufacturer. Individual sales organizations can deviate from the typical warranty period, and the conditions of sale relating to the original purchase order should be consulted. Damage caused by wear and tear, inadequate maintenance, corrosion, or by the effects of chemical processes are excluded from this warranty coverage. In the event of warranty claim, the defective goods should be sent (freight paid) to the Service Department of the relevant sales Organization for repair or replacement (at Yokogawa’s discretion). The following information must be included in the letter accompanying the returned goods:

1. Part Number, Model Code and Serial Number.

2. Original Purchase Order and Date.

3. Length of time in service and description of the process.

4. Description of the fault and circumstances of the failure.

5. Process/environmental conditions that may be related to the failure of the sensor

6. Statement as to whether warranty or nonwarranty service is requested.

7. Complete shipping and billing instructions for return of material, plus the name and phone number of a contact person that can be reached for further information.

Returned goods that have been in contact with process fluids must be decontaminated and disinfected prior to shipment. Goods should carry a certificate to this effect, for the health and safety of our employees. Material Safety Data sheets must be included for all components of the process to which the sensors/fittings have been exposed.

IM 12B6J3-E-H

2. GENERAL SPECIFICATIONS PH20

2-1. Measuring elements : pH glass electrode

: Silver chloride reference : Solid platinum electrode : Pt1000 temperature sensor.

2-2. Construction materials

Body : PVDF Earthing pin : Solid Platinum O-ring : Viton Reference junction : Porous PTFE Cable : Coaxial with 4 extra leads

2-3. Functional specifications (at 25°C)

Isothermal point : pH 7 Glass impedance : 200 MΩ (nominal) Reference system : Ag/AgCl with saturated KCl Junction resistance : 1 to10 kΩ Temperature element : Pt1000 to IEC 751 Asymmetry potential : < 15 mV Slope : > 96 % (of theoretical value)

NOTE:

The temperature sensor included in the PH20 is intended to provide indication and cell compensation. The construction has not been tested to the pressure vessel standards required for plant temperature control.

2-4. Dynamic specifications

Response time pH step (7 to 4) : < 10 sec for 90% Response time temp step (10°C) : < 3 min for 90 %

Stabilisation time (0.02 pH unit/ 10 s) : < 1 minute

2-5. Operating range

pH : 0 to 14 Temperature : -10 to 100 °C (14 to 212 °F) Pressure : 0 to 10 bar ( 0 to 145 PSIG) Conductivity : > 50 µS/cm Storage temperature : -30 to 50 °C (-22 to 122 °F)

NOTE:

Specifications should not be considered in isolation. For example the pH range can be 2-12 pH, where the measurement is at elevated temperatures. For advice about specific applications please contact your local sales office.

Pressure Effects on sensor mV

Conventional Sensor

Pressure

potential (m V)

Tempress

-180

-200

-220

-240

-260

-280

-300

200 250 300

time (min)>

pressure (bar)

The erratic trend of the standard sensor shows the progressive contamination of its reference junction. The graph indicates between 0.1 to 0.4 pH error with the conventional sensor while the readings from the Tempress are extremely stable.

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