FM-140XL DIGITAL CONDUCTIVITY
METER
EQUIPMENT SPECIFICATION ES-109
1.0 Description
1.1 The Model FM-140XL Digital Conductivity Meter is a
microprocessor based electronic testing instrument which utilizes induced eddy currents
to measure directly the electrical conductivity of nonmagnetic metals such as
copper, aluminum, brass, molybdenum, nickel, tin or zinc, in units of percent
International Annealed Copper Standard (%IACS). It can also provide an indirect measurement of properties
directly related to conductivity, such as heat treat condition or precipitation
hardening of aluminum alloys, phosphorous content and thermal conductivity of
copper.
1.2 The shielded probe, energized by 60
KHz alternating current, induces
circulating currents in the part to be measured. These induced currents which are a function of conductivity,
react back on the probe. This reaction
is then amplified and displayed. A
threshold gate can be set from the front panel to allow simple go/no go
sorting. Two conductivity samples are
permanently mounted to the top of the unit for ease of set-up. A 9-pin connector is available on the rear
of the unit to allow for RS-232 type communications.
2.0 Mechanical and Construction
2.1 Dimensions: 2.75” (7
cm) high x 8.5” (21.6 cm) wide x 9” (22.9 cm) deep
2.2 Weight: 5.0 lbs. (2.27
kg)
2.3 Readout: 3-½ digits, .43” (1.09
cm) seven segment LED display
2.4 The FM-140XL is housed in a
compact lightweight and shock resistant case for long life and durability. A protective carrying case with storage
pouch for probe and line cord is available.
3.0 Electrical and Performance
3.1 The FM-140XL is state-of-art design employing high
reliability microprocessor and integrated circuits.
3.2 Frequency: 60 KHz
3.3 Range: 10% to 110%
IACS
3.4 Accuracy is ± 0.5% IACS at 68oF (20oC)
3.5 Power Requirements: The FM-140XL
operates from two internal nickel cadmium battery packs of 6 volts each or from
115 or 220 volts, AC, 50/60 Hz power.
3.6 The battery charger is built
into the instrument and is energized through a 3-wire grounded power cord with
a polarized molded vinyl plug.
3.7 The batteries are rated for
approximately 10 hours continuous operation from the fully charged state, at 70o
F, before recharging is necessary. The
recharge time required is 10 to 14 hours.
3.8 RS-232 port at rear of the
unit. A simple instruction set enables
conductivity values to be loaded into separate computer, micro-controller, etc.
4.0 Operation
4.1 For initial calibration, the
ON button is push to energize the unit.
The high calibration is set by placing the probe on the high calibration
conductivity sample and pressing the up/down
arrow until the unit readout and the value of the sample are the
same. This procedure is then repeated
for the low sample. The unit is then
ready to use. An internal timer warns
the operator to verify the calibration of the unit every fifteen minutes. If the unit is left on and no readings are
taken in that fifteen minute interval, the unit will shut off to conserve
battery life. The calibration information
is saved in memory.
4.2 For gate operation, the
procedure is very much the same. The
unit is turned on and calibrated. The
GATE ON and SET buttons are pushed. To
set the low threshold, push the LOW button and then the up/down arrows to the
desired level. The same is done on the
high end. The GATE SET button is again
pushed. Now when the probe is placed on
a sample of material whose conductivity value is within the set high and low
limits, the green LED on the front panel will light. If the value is outside the limits set, the red LED will light.
5.0 Order Reference
5.1 Model FM-140XL
Digital Conductivity Unit, including calibration samples, line cord, probe, and
operating manual to operate on 115/60/1,
P/N 220220
5.2 Standard Accessories
5.2.1 Calibration
Samples: Copper, P/N
518542
Brass, P/N 518543
5.2.2 Line
Cord,
P/N 216214
5.2.3 Standard Probe, P/N 220245
5.3 Addendum Accessories
5.3.1 Carrying
Case, P/N 519739
6.0 References
6.1
Instruction Manual, Form No. 220220, effective August 1, 1996
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