Emerson Rosemount 398R Reference Manual
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Emerson Rosemount 398R Reference Manual

Ph/orp sensors
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Reference Manual
00809-0100-3098
Rev. AB
February 2019
™
Rosemount
398R/398RVP
pH/ORP Sensors

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Summary of Contents for Emerson Rosemount 398R

  • Page 1 Reference Manual 00809-0100-3098 Rev. AB February 2019 ™ Rosemount 398R/398RVP pH/ORP Sensors...
  • Page 2 hasgkas...
  • Page 3 Essential Instructions Read this page before proceeding! Emerson designs, manufactures and tests its products to meet many national and international stan- dards. Because these sensors are sophisticated technical products, you MUST properly install, use, and maintain them to ensure they continue to operate within their normal specifications. The following instructions MUST be adhered to and integrated into your safety program when installing, using, and maintaining Rosemount products.
  • Page 4 CAUTION Special Conditions for Safe Use 1. All pH/ORP sensors have a plastic enclosure which must only be cleaned with a damp cloth to avoid the danger due to a build up of an electrostatic charge. 2. All pH/ORP sensor models are intended to be in contact with the process fluid and may not meet the 500V r.m.s.

  • Page 5: Table Of Contents

    Ordering Information...................4 Section 2: Installation First Time Installation ..................7 Unpacking and Inspection ...................8 Mechanical Installation ..................8 Section 3: Wiring the Rosemount 398R/398RVP Sensor Wiring for Rosemount 398R/398RVP Sensor ............15 Section 5: Calibration General Information ..................27 Use of Calibration Buffers (Standards) ..............27 Two Point Buffer Calibration................28...
  • Page 6 Table of Contents Reference Manual February 2019 00809-0100-3098 Table of Contents...

  • Page 7: Section 1: Description And Specifications

    Section 1: Description and Specifications Features and Applications Rosemount 398R and 398RVP sensors feature a chemical resistant construction of Tefzel, titanium, and a TUpH reference junction which is ideal for measuring pH in harsh process liquids. These sensors can be used to measure pH in sour water strippers, in pulp bleaching towards that use chlorine dioxide, and in process streams containing a variety of organic solvents.

  • Page 8: Specifications

    Range Hemi Bulb 0-2 pH 2-12 pH 12-13 pH 13-14 pH Table 1-2: Rosemount 398R-398RVP sensor specifications Measured Range pH range 0 to 14 pH, GPHT ACCUGLASS ORP range -1500 mV to 1500 mV Maximum Pressure at Retraction or Insertion...

  • Page 9: Product Certifications

    Reference Manual Description and Specifications 00809-0100-3098 February 2019 Product Certifications Please see online certificates for further details. IECEx Sensors with no preamp (pH and ORP) – Ex ia IIC T4 Ga (-20°C ≤ Ta ≤ +60 °C) Sensors with SMART preamp (398RVP pH only) – Ex ia IIC T4 Ga (-20 °C ≤ Ta ≤ +60 °C) Per standards IEC60079-0 : 2011, IEC 60079-11 : 2011 ATEX Sensors without preamp (pH and ORP) –...

  • Page 10: Ordering Information

    Description and Specifications Reference Manual February 2019 00809-0100-3098 Ordering Information Table 1-4: Rosemount 398R ordering information Model Sensor type 398R pH/ORP Sensor Measuring Electrode Type pH - GPHT Glass pH - GPHT Flat Glass Sensor Length 21 Inch Titanium Tube...
  • Page 11 Reference Manual Description and Specifications 00809-0100-3098 February 2019 Table 1-5: Rosemount 398RVP ordering information Model Sensor type 398RVP pH/ORP Sensor Measuring Electrode Type pH - GPHT Glass pH - GPHR Flat Glass Sensor Length 21 Inch Titanium Tube 36 Inch Titanium Tube O-ring Material EPDM Viton...
  • Page 12 Description and Specifications Reference Manual February 2019 00809-0100-3098 Description and Specifications...

  • Page 13: Section 2: Installation

    Reference Manual Installation 00809-0100-3098 February 2019 Section 2: Installation First Time Installation For first time installations, using the following guide is recommended: Variopol Mating Connector Cables (Required for Rosemount 398RVP only) Choose one: PN 24281-00, 15 ft cable with mating VP connector PN 24281-06, 10 ft cable with mating VP connector Retractable Mounting A.

  • Page 14: Unpacking And Inspection

    Installation Reference Manual February 2019 00809-0100-3098 Unpacking and Inspection Inspect the outside of the carton for any damage. If damage is detected, contact the carrier immediately. Inspect the instrument and hardware. Make sure all items in the packing list are present and in good condition.
  • Page 15 Reference Manual Installation 00809-0100-3098 February 2019 Thread the male connector body tightly into the ball valve assembly. DO NOT tighten the hex nut on the male connector body; doing so would not allow the sensor to be inserted through the ball valve. Pull back hard on the sensor assembly, as if trying to remove the sensor, to be certain that the sensor cannot come free of the ball valve assembly.
  • Page 16 2.3.2 Installation Without Ball Valve Rosemount 398R and 398RVP Sensors may be installed through a weldalet or pipe tee or “Y” when used with a process connector (PN 23166-00 or 23166-01). The sensor should be installed within 80° of vertical, with the electrode facing down.
  • Page 17 Reference Manual Installation 00809-0100-3098 February 2019 Figure 2-4: Dimensional Warning Label and Sensor Diagram Note: For Rosemount 398RVP, the overall dimensional length increases by 1.9 inches (48 mm). Calibration and Maintenance...
  • Page 18 Installation Reference Manual February 2019 00809-0100-3098 Figure 2-5: Dimensional Drawing for Ball Valve Kit PN 23765-00 (shown with Rosemount 398RVP sensor) Installation...
  • Page 19 Reference Manual Installation 00809-0100-3098 February 2019 Figure 2-6: Dimensional Drawing for Ball Valve Kit PN 23240-00 (shown with Rosemount 398R). Note: For Rosemount 398RVP, the overall dimensional length increases by 1.9 inches (48 mm). Installation...
  • Page 20 February 2019 00809-0100-3098 Figure 2-7: Dimensional Drawing of Rosemount 398R shown with Sensor Head Junction Box, with and without 1-1/2 in. Ball Valve PN 23240-00 Note: For the installations shown, the 1 in. x 1 in. process connector (PN 23166-00 or 23166-01), sensor head junction boxes (various part numbers;...

  • Page 21: Section 3: Wiring The Rosemount 398R/398Rvp Sensor

    398R/398RVP Sensor Wiring for Rosemount 398R/398RVP For wiring diagrams not shown below, please refer to the Liquid Wiring Diagrams. Figure 3-1: Wire Configurations Figure 3-2: Wiring for Rosemount 398R-54-62 to 3081, 4081, and 5081 Transmitters. Wiring the Rosemount 398R/398RVP Sensor...
  • Page 22 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Figure 3-3: Wiring for 398R-54-62 Through Remote Junction Box PN 23555-00 Note: Sensor Model 398R-54 or 398R-54-60 can also be wired as shown above, but customer must prepare the BNC as shown in Figure 3-4. For preparing wires on end of extension cable, use Figure 3-5.
  • Page 23 Reference Manual Wiring the Rosemount 398R/398RVP Sensor 00809-0100-3098 February 2019 Figure 3-4: BNC Preparation Instructions Wiring the Rosemount 398R/398RVP Sensor...
  • Page 24 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Figure 3-5: Extension Cable Preparation Wiring the Rosemount 398R/398RVP Sensor...
  • Page 25 Reference Manual Wiring the Rosemount 398R/398RVP Sensor 00809-0100-3098 February 2019 Figure 3-6: Rosemount 398R-54-61 Wiring to Rosemount 1056/56 Transmitters Figure 3-7: Rosemount 398R-54-61 Wiring to Rosemount 1057 Transmitter Wiring the Rosemount 398R/398RVP Sensor...
  • Page 26 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Figure 3-8: Rosemount 398R-54-61 Wiring to Rosemount 1066 Transmitter Figure 3-9: Rosemount 398R-54-61 Wiring to Rosemount 5081 Wiring the Rosemount 398R/398RVP Sensor...
  • Page 27 Reference Manual Wiring the Rosemount 398R/398RVP Sensor 00809-0100-3098 February 2019 Figure 3-10: Rosemount 398R-xx-xx-54-62 Wiring to Rosemount 1056/56/1057 Transmitters Figure 3-11: Rosemount 398R-xx-xx-54-62 Wiring to Rosemount 1066 Transmitter Wiring the Rosemount 398R/398RVP Sensor...
  • Page 28 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Figure 3-12: Rosemount 398R-xx-xx-54-62 Wiring to Rosemount 5081 Transmitter Figure 3-13: Rosemount 398RVP Wiring to Rosemount 1056/56 Transmitters Wiring the Rosemount 398R/398RVP Sensor...
  • Page 29 Reference Manual Wiring the Rosemount 398R/398RVP Sensor 00809-0100-3098 February 2019 Figure 3-14: Rosemount 398RVP Wiring to Rosemount 1057 Transmitter Figure 3-15: Rosemount 398RVP Wiring to Rosemount 1066 Transmitter Wiring the Rosemount 398R/398RVP Sensor...
  • Page 30 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Figure 3-16: Rosemount 398RVP Wiring to Rosemount 5081 Transmitter Figure 3-17: Rosemount 398RVP-70 Wiring to Rosemount 1056/56/1057 Transmitters Wiring the Rosemount 398R/398RVP Sensor...
  • Page 31 Reference Manual Wiring the Rosemount 398R/398RVP Sensor 00809-0100-3098 February 2019 Figure 3-18: Rosemount 398RVP-70 Wiring to Rosemount 1066 Transmitter Figure 3-19: Rosemount 398RVP-70 Wiring to Rosemount 5081 Transmitter Wiring the Rosemount 398R/398RVP Sensor...
  • Page 32 Wiring the Rosemount 398R/398RVP Sensor Reference Manual February 2019 00809-0100-3098 Wiring the Rosemount 398R/398RVP Sensor...

  • Page 33: Section 5: Calibration

    Reference Manual Calibration 00809-0100-3098 February 2019 Section 5: Calibration General Information New sensors must be calibrated before use. Regular recalibration is also necessary and is determined by the user. The use of a two-point buffer calibration is always recommended. Refer to the transmitter Reference Manual for more specific calibration procedures. Use of Calibration Buffers (Standards) Good buffers lead to good calibrations: A pH measurement is only as good as the calibration, and the calibration is only as good as the buffers used.

  • Page 34: Two Point Buffer Calibration

    Calibration Reference Manual February 2019 00809-0100-3098 Two Point Buffer Calibration Remove the protective vinyl cap from the sensor tip. Rinse the sensor and immerse it in the first buffer. Ensure that the glass bulb and the temperature element are completely submerged by keeping the sensor tip about 3 inches below the liquid level.

  • Page 35: Orp Standardization

    Reference Manual Calibration 00809-0100-3098 February 2019 ORP Standardization There are relatively few ORP calibration standards available. The most popular one is a solution containing 0.1 M iron (II) and 0.1 M iron (III) in 1 M sulfuric acid. The standard is available from Rosemount as PN R508- 16OZ.
  • Page 36 Calibration Reference Manual February 2019 00809-0100-3098 Calibration...

  • Page 37: Section 6: Maintenance

    Generally, the greater the tendency of the process liquid to coat or foul the sensor, the more frequently maintenance should be done. Rosemount 398R and 398RVP sensors are fouling resistant and, they usually require maintenance less often than other pH (or ORP) sensors.

  • Page 38: Cleaning Procedures - Ph Sensors

    Reference Manual February 2019 00809-0100-3098 Rosemount 398R-25 and 398RVP-25 (36” tube) Be certain that pressure at the sensor is below 35 psig before proceeding with the retraction. It is also recommended that the personnel wear a face shield and have a stable footing.
  • Page 39 Figure 6-2: Tip of Rosemount 398R pH Sensor The figure shows the tip of the Rosemount 398R pH sensor. The bottom of the liquid junction is about even with the top of the wings that form the slotted tip. Keep acidic and alkaline solvents away from the liquid junction.

  • Page 40: Cleaning Procedures - Orp Sensors

    Maintenance Reference Manual February 2019 00809-0100-3098 Cleaning Procedures - ORP Sensors Clean platinum ORP electrodes by using a tissue to rub the metal surface with a paste of baking soda (sodium bicarbonate). A clean platinum electrode is bright and shiny. Checking the Reference Electrode Some processes contain substances, for example, sulfides, that poison the reference electrode.

  • Page 41: Rejuvenating Reference Electrodes

    138.5 Temperature Element Rosemount 398R/398RVP pH sensors produce a voltage which the instrument converts to pH using a temperature-dependent factor. A Pt 100 or a Balco 3K RTD built into the sensor measures temperature. To permit cor-rection for changes in lead resistance with temperature, a three-wire configuration (Figure 6-4) is used.

  • Page 42: Sensor Tube Replacement When Used With A Sensor Head Junction Box

    Maintenance Reference Manual February 2019 00809-0100-3098 Consult Table 6.1 (above) for temperature-resistance data. Lead resistance is about 0.05 ohm/ft at 25°C. Therefore, 15 ft of cable increases the resistance by about 1.5 ohm. The resistance between the RTD return and RTD sense leads should be less than 2 ohms. If a connection is open or shorted and should not be, replace the sensor.
  • Page 43 Reference Manual Maintenance 00809-0100-3098 February 2019 Make sure that the male connector body (E) is sufficiently tightened. The sensor will “click” into place by pulling the sensor tube away from the junction box, but will not move from side to side or pull clear of the male connector. If the sensor tube is correctly attached to the junction box, wrench tighten hex nut (F) on male connector body (E).
  • Page 44 Maintenance Reference Manual February 2019 00809-0100-3098 Maintenance...

  • Page 45: Section 7: Troubleshooting

    Reference Manual Troubleshooting 00809-0100-3098 February 2019 Section 7: Troubleshooting Troubleshooting Table 7-1, below, lists common problems, causes and remedies typically encountered in process measurement. For more specific troubleshooting information, please refer to the appropriate transmitter manual. Table 7-1: Troubleshooting Note: For any repair or warranty inquiries please contact our Customer Care group. Troubleshooting...
  • Page 46 Troubleshooting Reference Manual February 2019 00809-0100-3098 Table 7-1: Troubleshooting (continued) Troubleshooting...
  • Page 47 Reference Manual Troubleshooting 00809-0100-3098 February 2019 Table 7-1: Troubleshooting (continued) Troubleshooting...
  • Page 48 Heading title...

  • Page 49: Section 8: Accessories

    Reference Manual Accessories 00809-0100-3098 February 2019 Section 8: Accessories Accessories Table 8-1: Accessories for Rosemount 398R/398RVP Part Number Description 23557-00 Preamplifier for remote junction box (PN 23555-00), 23550-00 Remote Junction box with extension board 9550099 O-ring, Viton, for process connector...
  • Page 50 Accessories Reference Manual February 2019 00809-0100-3098 Accessories...

  • Page 51: Ec Declaration Of Conformity

    EU Declaration of Conformity No: RAD 1119 Rev. B pH/ORP Sensors Rosemount Inc. 8200 Market Boulevard Chanhassen, MN 55317-9685 declare under our sole responsibility that the product, Rosemount™ Sensor Models: 328A, 385, 385+ -04, 385+ -02/03, 385+-03-12, 389-01, 389-01-10/11-50, 389-01-10/11-54, 389-01-12-50, 389-01-12-54, 389-01-12-55, 389-02, 389VP, 389VP-70, 396, 396P-01-10/13-50, 396P-01-10/13-54, 396P-01-12-50, 396P-01-12-54, 396P-01-12-55, 396P-01-55, 396VP, 396VP-70, 396R, 396RVP, 396RVP-70, 396P-02, 396PVP, 396PVP-70, 397, 398, 398VP,...
  • Page 52 EU Declaration of Conformity No: RAD 1119 Rev. B ATEX Directive (2014/34/EU) Baseefa10ATEX0156X– Intrinsically Safe Equipment Group II, Category 1 G Ex ia IIC T4 Ga (-20°C ≤ Ta ≤ +60°C) (exceptions noted below) Model 328A Steam sterilizable pH sensor with integral cable Model 385 Retractable pH/ORP sensor with integral cable Model 385+ -04 pH/ORP sensor with integral cable Model 385+ -02/03 pH/ORP sensor with integral cable &...
  • Page 53 EU Declaration of Conformity No: RAD 1119 Rev. B Model 3300HTVP-70 Insertion/submersion pH sensor with Variopole connector & Smart preamplifier Model 3400HT Retractable pH sensor with integral cable Model 3400HTVP Retractable pH sensor with Variopole connector Model 3400HTVP-70 Retractable pH sensor with Variopole connector & Smart preamplifier Model 3500P-01 High performance pH sensor with integral cable &...
  • Page 54 China RoHS Table Reference Manual February 2019 00809-0100-3098 China RoHS Table...

  • Page 55: Intrisicallly Safe Sensor Installation Drawing - Fm

    Reference Manual FM Installation 00809-0100-3098 February 2019 Intrisically Safe Sensor Installation Drawing - FM FM Installation...
  • Page 56 ©2019 Emerson. All rights reserved. Emerson The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a mark of 8200 Market Blvd. one of the Emerson family of companies. All other marks are the property of their respective Chanhassen, MN 55317, owners.

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