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Before You Start
Introduction
Before You Start1
Introduction1.1
Field Metrology Wells (9142, 9143, and 9144) are designed to be reliable, stable heat sources
that can be used in the eld or laboratory. They offer accuracy, portability, and speed for nearly
every eld calibration application. The instruments have been designed with the eld user in
mind and are easy to use while maintaining stability, uniformity, and accuracy comparable to
some laboratory instruments.
Special built-in features make Field Metrology Wells extremely adaptable. The exclusive Volt-
age Compensation allows the technician to plug into mains power with voltage from 90 V ac to
250 V ac without degradation to the instrument. The Ambient Temperature Compensation (Pat-
ent Pending) provides the largest operating range in the industry (0°C to 50°C) with the largest
guaranteed temperature range (13°C to 33°C). The Gradient Temperature Compensation (Pat-
ent Pending) keeps the axial gradient within specication over the entire temperature range of
the instrument and over the specied guaranteed operating temperature range. These combined
features along with the rugged design, light weight, and small size make this line of instruments
ideal for eld applications.
Unique Patent Pending safety features make these the safest eld heat sources available. The
unique Air Flow Design (Patent Pending) keeps the probe handle cool protecting delicate in-
struments and the user. The Block Temperature Indicator (Patent Pending) shows the user when
the well temperature is above 50°C letting the user know when it is safe to remove the insert or
move the instrument. The indicator light illuminates when the instrument is energized and the
well is above 50°C. If the instrument is removed from mains power, the indicator light ashes
until the well has cooled to less than 50°C.
The optional “Process” version (“914X–P”) combines the heat source with a built-in readout
eliminating the need for the technician to take two instruments to the eld. The readout is per-
fect for transmitter loop, comparison calibration, or a simple check of a thermocouple sensor.
There is no need to carry additional tools into the eld with the “Process” option of a built-in
readout for resistance, voltage, and mA measurement, 24V loop power, and on-board documen-
tation. The convenient smart reference connector automatically transfers and stores the probe
coefcients.
The Field Metrology Wells’ controller uses a PRT sensor and thermoelectric modules or heaters
to achieve stable, uniform temperatures throughout the block.
The LCD display continuously shows many useful operating parameters including the block
temperature, the current set-point, block stability, and heating and cooling status. For the Pro-
cess version, the reference temperature and secondary input type (UUT) readings are displayed.
The display can be set to show the information in one of eight different languages; English,
Japanese, Chinese, German, Spanish, French, Russian, and Italian.
The instrument’s rugged design and special features make them ideal for the eld or the labora-
tory. With proper use, the instrument provides continued accurate calibration of temperature
