General Purpose ph/orp Sensor

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General Purpose pH/ORP Sensor

The wetted sensor materials may not be compatible with process com position and operating conditions. Application compat ibility is entirely the responsibility of the user.

CAUTION: SENSOR/PROCESS APPLICATION COMPATIBILITY

Before removing the sensor, be absolutely certain that the process pressure is reduced to 0 psig and the process temperature is lowered to a safe level!

WARNING

Specifications

Sensor Type: General purpose 3900 Measured Range:

pH AccuGlass 0-14 ORP -1500 to +1500 mV

Percent Linearity Over pH Range:

Operating Temperature: -10° to 100°C (14° to 212°F) Automatic temperature compensation -10° to 100°C (14° to 212°F)

Maximum Pressure: 790 kPa [abs] (100 psig) at 100°C (212°F) CRN rating: 60 psig up to 100°C (212°F).

Materials of Construction: stainless steel, glass, Teflon, polyphenylene sulfide (PPS), and EPDM

Range Linearity 0 - 7 97% 1 - 7 98% 4 - 7 98% 7 - 10 99% 7 - 12 97% 7 - 13 96%

7 - 14 95% Materials of ORP: Platinum

Process Connections:

Front facing: 3⁄4˝ and 1˝ MNPT Rear facing: 1˝ MNPT

Integral Cable: 32 ft (10m) cable with integral SMART preamp; 15 ft (4.7m) cable without preamp sensor VP8 Cable: use 24281-XX, 2.5 ft (.8m) to 100 ft (31m) Weight/Shipping Weight: 0.45 kg/0.9 kg (1 lb/2 lb)

Figure 1. 3900 Insertion/Submersion Sensor

The 3900 Sensor responds to changes in pH at a minimum conductivity of 0.1mS/cm in deionized water. Sample flow rate must be controlled to 2 gph (7.6L/hr). The offset is approximately -0.2 pH after 3 months at ambient temperature.

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Storage

1. It is recommended that electrodes be stored in their original shipping containers until needed.

2. Do not store at temperatures below -10°C (14°F). 3. Electrodes should be stored with a protective cap

containing KCl solution (PN 9210342).

4. For overnight storage, immerse the sensor in tap water or 4 pH buffer solution.

5. pH glass electrodes slowly deteriorate in storage. There is no specific expiration date. However, the calibration procedure described below should be followed to determine that the sensor calibrates properly.

Electrode preparation

1. Remove electrode from shipping container.

2. Remove the protective boot covering the electrode bulb. 3. Rinse away salt film with clean water, then shake the

electrode so that the internal solution fills the bulb, thus removing any air trapped there.

Installation

For sensor orientation, see Figure 2. For sensor dimensions, see Figure 3. For mounting options, see Figures 4-7. For wiring, see Figures 8-41.

For additional wiring information, please visit our website at www.emersonprocess.com/raihome/liquid/wiring. Wrap the sensor threads with six or seven (6–7) turns of Teflon tape to prevent leakage. Do not over tighten the sensor into it’s receptacle. Hand tighten the sensor, and then tighten one or two (1–2) turns with a wrench.

Two point buffer calibration

Select two stable buffer solutions, preferably pH 4.0

and 10.0 (pH buffers other than pH 4.0 and pH 10.0 can be used as long as the pH values are at least two pH units apart).

NOTE: A pH 7 buffer solution reads a mV value of approx. zero, and pH buffers read approximately ± 59.1 mV for each pH unit above or below pH 7. Check the pH buffer manufacturer specifications for millivolt values at various temperatures since it may affect the actual value of the buffer solution mV/pH value.

1. Immerse sensor in the first buffer solution. Allow sensor to equilibrate to the buffer temperature (to avoid errors due to temperature differences between the buffer solution and sensor temperature) and wait for reading to stabilize. Value of buffer can now be acknowledged by analyzer/ transmitter.

2. Once the first buffer has been acknowledged by the analyzer/transmitter, rinse the buffer solution off of the sensor with distilled or deionized water.

3. Repeat steps 1 and 2 using the second buffer solution.

4. The theoretical slope value, according to the Nernst equation for calculating pH, is approximately 59.1 mV/pH. Over time the sensor will age, both in the process and in storage, which will result in reduced slope values. To ensure accurate readings, it is recommended that the electrode be replaced when the slope value falls below 47 to 49 mV/pH.

Recommended pH Sensor

Standardization

For maximum accuracy, the sensor can be standardized on-line or with a process grab sample after a buffer calibration has been performed and the sensor has been conditioned to the process. Standardization accounts for the sensor junction potential and other interferences. Standardization will not change the sensor’s slope but will simply adjust the analyzer’s reading to match that of the known process pH.

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. a.c. test to earth. This must be taken into consideration at installation.

ATEX DIRECTIVE: Special Conditions for safe use

The solution used during calibration is an acid and should be handled with care. Follow the directions of the acid manufacturer. Wear the proper protective equipment. Do not let the solution come in contact with skin or clothing. If contact with skin is made, immedi-ately rinse with clean water.

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3 3/4 IN MNPT 1 IN MNPT WRENCH FLATS 1.30 IN ACROSS 1 IN MNPT TEMP COMP SOLN GND REFERENCE JUNCTION pH ELECTRODE .92 2.33 8.63 6.91

Maintenance for pH electrode

Electrodes should respond rapidly. Sluggishness, offsets, and erratic readings are indicators that the electrodes may need cleaning or replacement.

1. To remove oil deposit, clean the electrode with a mild non-abrasive detergent.

2. To remove scale deposits, soak electrodes for 1 to 5 minutes in a 5% hydrochloric acid solution.

3. Temperature effect on life expectancy: If glass electrode life expectancy is 100% at 25°C (77°F), then it will be approximately 25% at 80°C (176°F), and approximately 10% at 100°C (212°F).

ORP Calibration

1. After making an electrical connection between the sensor and the instrument, obtain a standard solution of saturated quinhydrone PN R508-8OZ (475mV). This can also be made quite simply by adding a few crystals of quinhydrone to either pH 4 or pH 7 buffer. Quinhydrone is only slightly soluble, therefore only a few crystals will be required. 2. Immerse the sensor in the standard solution. Allow

1-2 minutes for the ORP sensor to stabilize. 3. Standardize the instrument to the solution value

shown in the table, right. The resulting potentials, measured with a clean platinum electrode and Hydrochloric acid is toxic and highly corrosive. Avoid skin contact, wear protective gloves. Use only in a well venti-lated area. Do not inhale fumes. In case of an accident, consult a doctor immediately.

CAUTION

saturated KCl/AgCl reference electrode, should be within +/- 20 millivolts of the value shown in the table below. Solution temperature must be noted to ensure accurate interpretation of results. The ORP value of saturated quinhydrone solution is not stable over long periods of time. Therefore, these standards should be made up fresh each time they are used. 4. Remove the sensor from the buffer, rinse, and install

in the process.

Maintenance for ORP Electrode

Electrodes should respond rapidly. Sluggishness, offsets, and erratic readings are indicators that the electrodes may need cleaning or replacement.

1. To remove oil deposit, clean the electrode with a mild non-abrasive detergent.

2. To remove scale deposits, soak electrodes for 1 to 5 minutes in a 5% hydrochloric acid solution.

3. ORP (metallic) electrodes should be polished with moistened baking soda.

Figure 2. Sensor Orientation

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Figure 4. Typical Flow Through insertion installation using PN 2002011 Pipe Tee (sensor must be installed at least 10° above the horizon)

Figure 5. Low Flow Cell PN 24091-00

psig (kPa [abs]) °F (°C)

150 (1136) 150 (65) 128 (984) 160 (71) 102 (805) 170 (77) 80 (653) 180 (82) 57 (494) 200 (93) 48 (432) 210 (99)

Horizontal Pipe Tee (PN 2002011) Pressure/Temperature Ratings

Inlet and outlet connections are stainless steel and take 1/4-inch OD tubing. Flow cell is polycarbonate with 1/4-inch FNPT fittings.

Wetted materials:

Body & Nut – Polyester/Polycarbonate Fittings – 316 SST

Seals – Silicone Flow cell ratings:

Temperature: 32˚-158˚F (0-70˚C) Max. Pressure: 90 PSIG (721 kPa [abs]) Flow rate: 2-5 GPH (7.6-18.9 LPH) INCH MILLIMETER 3/4 IN MNPT 1 IN MNPT WRENCH FLATS 1.30 IN ACROSS 1 IN MNPT TEMP COMP SOLN GND REFERENCE JUNCTION pH ELECTRODE .92 2.33 8.63 6.91 Figure 3. Sensor Dimensions

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5 Figure 6. Jet Spray Cleaner PN 12707-00 (sensor must be installed at least 10° above the horizon)

Figure 7. Low Flow Panel PN SQP10077-LQD

The Jet Spray Cleaner eliminates routine, manual sensor maintenance by cleaning the sensor with water or compressed air. Flow through the cleaner can be controlled by a solenoid valve.

NOTE: The Jet Spray Cleaner can be used with Handrail Mounting Assembly (PN 11275-01, not shown) or can be mounted through conduit as shown below.

Jet Spray Cleaner shown with 3900VP pH sensor

Inlet flow 3-80 gph (11.4-304 L/hr)

Inlet pressure 3 – 65 psig (122 – 549 kPa abs)*

Temperature 32 - 122°F (0 - 50°C)

*The minimum inlet pressure is required to open a check valve, which pre-vents the flow cell from draining if sample flow is lost. Removing the check valve lowers the inlet pressure requirement to a few feet of water head.

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Figure 8. 3900-01 and 3900VP-01 to 54epH/ORP

Figure 9. 3900-02 and 3900VP-02 to 54epH/ORP

For additional wiring information on this product, including sensor combinations not shown here, please refer to either our online wiring programs or the Manual DVD enclosed with each product.

1056, 1057, 56, 5081, 6081, 54e, and XMT: http://www3.emersonprocess.com/raihome/sp/liquid/wiring/XMT/

1066 and sensors with SMART preamps: http://www2.emersonprocess.com/en-US/brands/rosemountanalytical/Liquid/Sensors/Pages/ Wiring_Diagram.aspx 1055: http://www3.emersonprocess.com/raihome/sp/liquid/wiring/1055

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7 Figure 10. Sensor Wiring 3900VP-01 gray cable to 54epH/ORP

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Figure 12. 3900-01 and 3900VP-01 to Xmt

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9 Figure 14. Sensor Wiring 3900VP-01 with gray cable to XMT

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Figure 16. 3900-01 and 3900VP-01 to 1055

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11 Figure 18. 3900-02 and 3900VP-02 to 1055

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Figure 20. Wiring with Remote Junction Box and Preamp (PN 23555-00) to 3900-02 and 3900VP-02

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13 Figure 22. 3900 Sensors, Preamplifier in Junction Box

1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ ₁₂ 1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ 1 2 3 4 5 6 7 8 9 ₁₀ 1 2 3 4 5 6 7 8 9 ₁₀ BN C No Connection TB 2 TB 1 Green White/Red Wh it e

Red White/Gray Gray

Blue Clea r Oran ge Green (+5 VDC) Brown (-5VDC) 54epH/ORP 5081 Wh ite/Black ( mV/pH Shield ) Blue (Solution Ground ) Gray (Reference in ) Wh ite/Gray (Reference Shield ) Red (RTD in ) Wh ite (R TD Return ) ID (inner drain) Black ( mV/pH in ) XM T +5VDC / +V SNSR RTD SENSE /SNS RTD IN pH/pH in -5 VDC / -V SNSR RTD RTN /RTN Ref SHLD / SHLD /GUAR D pH SHLD / SHLD / GUARD REF / REF IN GND/SOL GN D 12 1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ 1 2 3 4 5 6 7 8 9 ₁₀ Wh ite/Red (R TD Sense) ID (inner drain) (No Connection Rosemount Analytical intruments: 56 / 1056 / 1057 / 1066 / 6081 • For 3900-02 and 3900VP-02 sensors • Non-pr eamp sensor s • Blue Cable

3900 Sensor

s, Pr

eamplifier in Junction

Bo

x

Remote Junction

Box PN 23555-00 or Sensor Head Junction Box PN 23709-00

(Both J-boxes

include Preamplifier Board PN 23557-00)

Extension

Cable PN 23646-01 or

9200273 shown Extension

Cable PN 9200348 can also

be

used; extend color scheme

from

sensor or VP8 cable instead of usin

g

shown wiring scheme.

Connect to instrumen t ground or as show n

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Figure 23. 3900 Sensors, Preamplifier in Sensor

Green White/Red White Re d _White/Gray Gray Blu e Clea r Orang e 54epH/ORP 508 1 Clear ( mV/pH Shield )

Blue (Solution Ground)

Gray (Reference in ) White/Gray (-5V) Red (RTD in ) White/Red (RTD Sense) White (RTD Return ) Green Orange ( mV/pH in ) XM T 12 1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ 1 2 3 4 5 6 7 8 9 10

Connect to instrument ground

or as show n ID (inner drain) (+5V) +5VDC / +V SNSR RTD SENSE /SNS RTD IN pH/pH in -5 VDC / -V SNSR RTD RTN /RTN Ref SH LD / SHLD /GUARD pH SHLD / SHLD / GUAR D REF / REF IN GND/SOL GN D -70, 3400HTVP-70, -01 Rosemount Analytical intruments: 56 / 1056 / 1057 / 1066 / 6081 • For 3900-01 and 3900VP-01 sensors • Pr eamplifier in senso r • Blue Cable

3900 Sensor

s, Pr

eamplifier in Sensor

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15 Figure 23. 3900 Sensors, Preamplifier in Sensor

1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ ₁₂ 1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 Remote Junction Box PN 23550-00 (with Extension board

for point-to-point wiring)

TB 2 TB 1 Green White/Red White Re d White/Gray Gray Blue

Clear (Orange shield

) Orang e Extension Cable PN 23646-01 or 9200273 shown. Extension Cable PN 920034 8

can also be used; White/gray is replacement wire color for Brown

wire. Green (+5 VDC ) 54epH/ORP 5081 White/Black (mV/pH Sheild)

Blue (Solution Ground)

Gray

(Reference

in

)

White/Gray (No connection)

Red (RTD in

)

White

(RTD Return

)

Inner Drain Black ( mV/pH in

) XM T 12 1 2 3 4 5 6 7 8 9 ₁₀ ₁₁ 1 2 3 4 5 6 7 8 9 ₁₀ 12 11 ID (inner drain)

Connect to instrument ground

or as shown White/Red (RTD Sense) +5VDC / +V SNSR RTD SENSE /SNS RTD IN pH/pH in -5 VDC / -V SNSR RTD RTN /RTN Ref SH LD / SHLD /GUARD pH SHLD / SHLD / GUAR D REF / REF IN GND/SOL GN D Brown (-5VDC)

3900 Sensor

s, Preamplifier in Sensor,

Junction Box used for extending cabl

e

Rosemount Analytical intruments: 56 / 1056 / 1057 / 1066 / 6081 • For 3900-01 and 3900VP-02 sensors • Pr eamplifier in senso r • Blue Cable

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Figure 22. 3900-01 and 3900VP-01 to Models 5081, 4081 or 3081

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17 Figure 10. Wiring for 3900-01 and 3900VP-01 to 56, 1056 & 1057 pH

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Figure 26. Sensor Wiring 3900VP-01 with gray cable to 1056/56

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19 Figure 28. Sensor Wiring 3900VP-01 with gray cable to 1057

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Figure 30. pH/ORP Sensor Wiring – 1066/3900VP-01 (blue cable – refer to manual for recommended cable order)

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21 Figure 32. pH/ORP Sensor Wiring – 1066/3900VP-01 (refer to manual for recommended cable order)

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Figure 34. pH/ORP Sensor Wiring – 1066/3900VP-02 (refer to manual for recommended cable order)

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Figure 38. 3900-01 and 3900VP-01 to 6081-P

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Ordering Information

The 3900/3900VP pH/ORP Sensor is housed in a PSS plastic body with built-in solution ground for advanced diagnostics. A Pt-100 RTD is offered for temperature compensator. The sensor is available with an integral cable or VP8 connector. Junction box kits with preamplifiers

can be ordered separately if an analyzer/ transmitter with an integral preamplifier is not located within 15 ft. of the sensor. SMART preamplifier (-01) is the standard pream-plifier option, and is compatible with models XMT, 3081, 5081, 6081, 54e, 1055 and 1056 analyzers/transmitters.

3900 pH/ORP Sensor - New Generation general purpose sensor

3900VP pH/ORP Sensor - New Generation general purpose sensor with VP

EXAMPLE 3900 - 01 - 12

EXAMPLE 3900VP - 02 - 10

Code Preamplifier Option

01 Preamplifier

02 No preamplifier

Code Measuring Electrode

10 General Purpose Low resistivity GPLR pH Glass (0 - 14pH)

12 Platinum ORP

Code Preamplifier Option

01 Preamplifier

02 No preamplifier

Code Measuring Electrode

10 General Purpose Low resistivity GPLR pH Glass (0 - 14pH)

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Part Number Description

24281-00 15 ft. cable with mating VP8 connector

24281-02 2.5 ft. cable with mating VP8 connector

12707-00 Jet cleaner

23242-02 Insertion adapter

24091-00 Low flow cell

23555-00 Junction Box with Preamplifier for Models 54e, 3081, 4081, 5081, XMT, 1055, 1056

2002011 CPVC flow through Tee, 1-1/2 in. NPT process connection

11275-01 Sensor handrail assembly

9210012

Buffer solution, 4.01 pH, 16oz

9210013

9210014

9200273

Extension cable, gray

9200348

Extension cable, blue

SQP10077-LQD Low Flow Control Panel

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Credit Cards for U.S. Purchases Only. 8

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