OfiTE 130-85 Manuel utilisateur
Analog Resistivity Meter
Part No. 130-85
Instruction Manual
Updated 8/5/2011
Ver. 1.4
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 2011
Table of
Contents
Intro....................................................................................................2
Components......................................................................................2
Procedure..........................................................................................3
Maintenance......................................................................................4
Nomograph .......................................................................................5
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com 1
Components
The OFITE Resistivity Meter is a portable measuring device designed to
give a quick, reliable measurement of the resistivity of a small sample
expressed in ohm-meters. The transistorized meter accurately measures
the resistivity of fluids, slurries and semisolids having resistivities from 0.01
to 10 ohm-meter. This ohm-meter reading may be converted into parts per
million (ppm) Sodium Chloride using the nomograph provided. Conductivity
is the reciprocal of resistivity.
The transparent lucite cell with built-in thermometer may be easily removed
and cleaned. The meter is powered by readily available 9 volt batteries and
it is rugged and suitable for field usage.
#130-85-02 Resistivity Probe with Thermometer (65314)
#130-85-04 Rubber Suction Bulb for Probe (63207)
#147-02 9-Volt Battery
#165-43 Pipe Cleaner
Optional:
#130-87-014 Calibration Fluid, 1,413 Microsiemens
#130-87-015 Calibration Fluid, 10,000 Microsiemens
#130-87-016 Calibration Fluid, 50,000 Microsiemens
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com 2
Intro
1. Use the suction bulb to pull the sample into the lucite cell. Empty and
refill the cell several times to thoroughly wet the cylinder walls.
2. Connect the cell assembly to the two terminal posts on the meter. Be
sure the sample fills the area between the two metal posts in the cell. If
the sample is not at room temperature, wait for the temperature of the
sample and cell to reach equilibrium.
3. Depress and hold the black button to calibrate the meter. Turn the
adjusting control knob to set the meter needle to the "ADJ" position.
4. Depress both the black and the red button at the same time, and read
the resistivity of the sample directly from the meter in ohm-meters.
5. Using the thermometer in the cell wall, read and note the temperature
of the sample.
6. Using the nomograph, convert the resisitvity value to concentration of
Chlorides.
Semi Solid Samples (Filter cakes, Mud Solids, etc.):
1. Prepare samples of uniform moisture content.
2. Fill the slot on the outer surface of the cell completely with a semi-solid
sample.
3. Follow steps 2 through 6 in the above procedure.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com 3
Procedure
Bulb
Slot
Maintenance 1. Always clean the cell immediately after making a measurement. Purge
the cell with distilled water until it is clear. If additional cleaning is nec-
essary, use a pipe cleaner and mild soap. Use no other solvents. Avoid
scratching the surface of the cell.
2. When it is no longer possible to calibrate the meter with the zero con-
trol, replace the 9-volt alkaline batteries (#147-02). Observe the polarity
markings on the printed circuit board.
3. If the mercury in the sample cell thermometer separates, it must be
reunited. First try shaking it down. If this does not reunite the mercury,
place the cell into hot water until the mercury just enters the top void.
Then remove the cell from the hot water and insert it into ice water to
pull the loose mercury into the graduated tube.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com 4
Nomograph
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ofite.com 5
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