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Instruction Manual
PN 51-381/rev.E
Model 381
March 2010
pH/ORP Sensor
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DANGER ESSENTIAL INSTRUCTIONS HAZARDOUS AREA INSTALLATION READ THIS PAGE BEFORE Installations near flammable liquids or in haz- PROCEEDING! ardous area locations must be carefully eval- uated by qualified on site safety personnel. Rosemount Analytical designs, manufactures, and tests its This sensor is not Intrinsically Safe or products to meet many national and international stan- Explosion Proof. dards. Because these instruments are sophisticated tech- nical products, you must properly insta
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MODEL 381 pH/ORP TABLE OF CONTENTS MODEL 381 pH/ORP SENSOR TABLE OF CONTENTS Section Title Page 1.0 DESCRIPTION AND SPECIFICATIONS........................................................... 1 1.1 Features and Applications................................................................................. 1 1.2 Sensor Specifications........................................................................................ 2 1.3 Ordering Information ......................................................
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MODEL 381 pH/ORP TABLE OF CONTENTS MODEL 381 pH/ORP SENSOR LIST OF FIGURES Figure No. Title Page 1-1 Dimensional Drawing ........................................................................................ 3 1-2 Mounting Drawing ............................................................................................. 3 2-1 Model 381 Sensor Component Locator Diagram.............................................. 6 2-2 Submersion Installation Diagram ........................................
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MODEL 381 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS SECTION 1.0 DESCRIPTION AND SPECIFICATIONS • MOLDED POLYETHERSULFONE (PES) BODY provides compatibility with a variety of processes. • MODULAR DESIGN facilitates maintenance by eliminating terminal and mounting brackets and extraneous hardware. • INTEGRAL PREAMPLIFIER provides reliable signal transmission. • DOUBLE JUNCTION, GEL-FILLED, REFERENCE CELL provides high temperature per- formance, extended service life, and resists the effects
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MODEL 381 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.2 SENSOR SPECIFICATIONS Materials of Construction: Body, Cover and Flow Cell: Polyethersulfone (PES). 2. O-Rings: Viton Measuring Electrode: Glass (and platinum for Model 381 ORP). 3 Liquid Junction: Kynar /wood (Code 20) or Kynar/ceramic (Code 21). Process Connections: Submersion: 3/4 inch MNPT. Insertion: 2 inch MNPT. Flow Through:3/4 inch MNPT. Dimensions: (see Figure 1-1). Measuring Range: pH 0-14 ORP –1500mV to +1500mV Temperat
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MODEL 381 pH/ORP SECTION 1.0 DESCRIPTION AND SPECIFICATIONS 1.3 ORDERING INFORMATION Model pH/ORP Sensor is housed in a PES body suitable for insertion, submer- sion or flow through installation. The sensor includes an integral preamplifier, measuring electrode, double junc- tion gel-filled reference cell, automatic temperature compensation for pH, and a choice of two cable lengths of either 15 ft. or 50 ft. (4.5 or 15.2 m). MODEL 381 INSERTION, SUBMERSION, FLOW THROUGH SENSOR CODE FUNCTION pH R
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION SECTION 2.0 INSTALLATION 2.1 INSTALLATION. Prepare the sensor for instal lation IMPORTANT! as follows (see Figure 2-1): 12. While holding the sensor in an up side down posi- 1. Remove the cover from the body by grasping the tion (see Figure 2-1), remove the 1/4 inch plug body and rotating the cover 1/4 turn counter- from the electrode tip end of the sensor. clockwise. 13. Install the liquid junction in place of the 1/4 inch 2. When the cover breaks loose
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION FIGURE 2-1. Model 381 Sensor Component Locator Diagram 6
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION 2.3 INSERTION INSTALLATION (Code 00). To install NOTE the sensor in the side of a tank, in a pipeline, or in a Electrode shroud and coupling nut should pipe “tee”, proceed as follows (see Figure 2-3): be hand tightened only. Do not use a wrench. When tightening process or sample CAUTION line connectors to the flow cell do not use a Sensor must be installed within 80° of the pipe wrench on the flow cell. Severe dam- vertical plane (see Figure 2-3). age may
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION FIGURE 2-2. Submersion Installation Diagram FIGURE 2-3. Insertion Installation Diagram 8
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION FIGURE 2-4. Flow Through Installation Diagram (Code 03 or 04) FIGURE 2-5. Installation Details Low Flow Conditions Model 381 (Code 03 and 04) 9
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION PRESSURE DROP AND RECOMMENDED FLOW RATES- FLOW POWERED CLEANER (CODE 04) PSIG kPa 20 240 POSSIBLE ELECTRODE DAMAGE ABOVE THE THIS POINT 220 15 200 RECOMMEND- 180 ED OPERATING RANGER 10 160 140 5 120 INEFFECTIVE CLEANING BELOW THIS POINT 100 gpm @ 60° 12 3 4 5 6 7 8 liters/min 5 10 152025 30 FLOW RATE FIGURE 2-6. Retro-Fit Kit Code 04 Flow Powered Cleaner, Model 381 10 PRESSURE DROP
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION WHEN INCH AND METRIC DIMS ARE GIVEN MILLIMETER INCH DWG. NO. REV. 40038105 L FIGURE 2-7. Flow Through Diagram and Wiring (Code 03 or 04) 11
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION WHEN INCH AND METRIC DIMS ARE GIVEN MILLIMETER INCH DWG. NO. REV. 40038103 J FIGURE 2-8. Remote Junction Box with Internal Preamp 12
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION WHEN INCH AND METRIC DIMS ARE GIVEN MILLIMETER INCH DWG. NO. REV. DWG. NO. REV. 40038115 K 40038116 I FIGURE 2-9. Wiring with Weatherproof or Div. 2 (Code 52) Junction Box 13
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MODEL 381pH/ORP SECTION 2.0 INSTALLATION 2.9.2 Calibration 2.7 START-UP AND CALIBRATION 2.8 MODEL 381 pH and pHE CAUTION 2.8.1 SENSOR PREPARATION. Shake down the The solution used during the following check sensor to remove any air bubbles that may be present is an acid and should be handled with care. at the tip of the pH glass bulb. In most cases, the pH Follow the directions of the acid manufactur- sensor can simply be installed as shipped and read- er. Wear the proper protective equipment. D
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MODEL 381pH/ORP SECTION 3.0 MAINTENANCE SECTION 3.0 MAINTENANCE 7. Remove and discard the double junction elec- 3.1 GENERAL. This section provides instructions for trode. performing periodic maintenance and for determining the cause of a malfunction (troubleshooting). 8. Remove and discard the O-rings on the body. 9. Install a new double junction electrode in the body 3.2 PERIODIC MAINTENANCE. The following period- (refer to Table 3-4 Spare Parts). ic maintenance is based on operation in a water
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MODEL 381pH/ORP SECTION 3.0 MAINTENANCE 3.3 MODEL 381 Slowly and carefully add 56.2 milliliters of concentrated sulfuric acid. Add sufficient water to bring the total solu- 3.3.1 Platinum Electrode Check. The platinum elec- tion volume up to 1000 ml. This standard ORP solution, trode may be checked as follows: There are two types although not as simple to prepare as the quinhydrone of standard solutions which may be used to check the recipe, is much more stable, and will maintain its milli- ORP
