Srita

Electrical Stability Meter
Part No. 131-50

Instruction Manual
Updated 9/3/2010 Ver. 2.1 OFI Testing Equipment, Inc. 11302 Steeplecrest Dr. · Houston, Texas · 77065 · U.S.A. Tele: 832.320.7300 · Fax: 713.880.9886 · www.ofite.com
©

Copyright OFITE 2012

Table of Contents

Intro....................................................................................................2Description........................................................................................2 Components......................................................................................3 Specifications ...................................................................................4 Procedure..........................................................................................5Calibration - Performance Test.......................................................6

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com

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Intro

The OFITE Electrical Stability Meter (ES) is a sine wave instrument. It is manufactured in accordance with the American Petroleum Institute (API) “Recommended Practice Standard Procedure forField Testing Oil-Based Drilling Fluids”, 13B-2. It is accurate, compact, and portable and is intended for routine field and laboratory use to measure the relative electrical strength of drilling fluids having a continuous oil phase. The ES Meter is self contained and consists of a meter and probe, and it operates on four 9 volt alkaline batteries which are readily obtainable. Two calibrationstandards (high and low) are included with each unit to ensure accuracy.

Description

The dielectric breakdown voltage is the point at which the drilling fluid becomes electrically conductive. The DC power source of the batteries provides an AC voltage to the electrodes at a low frequency. The unit provides a constant rate of voltage increase until the emulsion becomes electrically conductive. Acurrent flow of 61 micro amps (61 μA) across the electrodes will cause the display to stop and the reading will be held as long as the switch is depressed. The reading is called the electrical stability, emulsion stability or ES value of the fluid. The electrical stability value will decrease with increasing testing temperature. The recommended API test temperature is 120°F ± 5° (49°C ± 3°). Thechemical composition and the shear history of a drilling fluid control the absolute magnitude of the ES in a complex fashion. Therefore, interpreting the oil-wet state of a mud from a single ES measurement is not appropriate. Only trends in ES should be used in making treatment decisions.

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 /www.ofite.com

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Components

#131-01 #131-51 #147-02 Optional: #110-10 #130-38 #130-38-1 #154-01 #154-22

Probe with Cable High/Low Calibration Standard 9-Volt Alkaline Battery

Marsh Funnel Viscometer or 12 mesh screen Thermocup, 115 Volt Thermocup, 230 Volt Dual-Scale Thermometer with Metal Dial; 5" Stem; 0 - 220°F; -10 - 100°C Pocket Thermometer; 1"; 0-220°F

#131-50-SP: Spare Parts for#131-50: #131-01 Probe with Cable #147-02 9-Volt Alkaline Battery; Qty: 8

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com

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Specifications

Meter: Wave form: AC Frequency: Output Units: Ramp Rate: Minimum Output Range: Trip Current: Size: Weight: Shipping Size: Shipping Weight: Electrode: Housing:

Sine, < 5% total harmonicdistortion 340 ± 10 Hz Peak Volts 150 ± 10 Volts per second, automatic operation 3 - 2,000 Volts (Peak) 61 ± 5 μA 9.5" × 6.5" × 3.5" (24.1 × 16.5 × 8.9 cm) 2 lbs. 15 oz. (1.3 kg) 11" × 11" × 7" (28 × 28 × 18 cm) 10 lbs. (4.54 kg)

Material resistant to oil mud components up to 220°F (105°C) Material: Corrosion-resistant metal Diameter: 0.125" ± 0.001" (3.18 ± 0.03 mm) Spacing (gap): 0.061" ±...