MESA LABORATORIES, INC. DataTrace Division
Standard
Operating
Procedure
Release Date: August 27, 2010
Page: 25 of 32
Revision B
D. Unscrew and remove the sensor cover from the Pressure Tracer. Replace the cover
with a Hansen Fitting (124770-500) or Hansen Fitting w/Tube (124770-501).
E. Connect the Hansen Fitting to a female disconnect on the pressure circuit. If a
disconnect is not installed on the pressure circuit, the Hansen Fitting w/Tube can be
connected via a ¼ inch compression fitting.
F. Set the pressurized circuit to the target pressure and allow it to stabilize for several
minutes.
G. Note the time and pressure value indicated on the reference device.
H. If verification of pressures at various temperatures is required, it is possible to place
the Tracer, reference, and pressure circuit in an oven that can maintain a stable
elevated temperature.
I.
Remove the Pressure Tracer from the circuit and up load the data via DTW.
J. Compare the value displayed by the Pressure Tracer with the value noted from the
reference at the time noted in step G.
K. If the pressure value indicated by the Pressure Tracer is outside of an acceptable
range, return the Tracer to the factory for service.
8.8. Calibration
The following procedures provide instructions for performing field calibrations on DataTrace
®
equipment. There are two types of calibrations that are possible. The first is for temperature in the
Micropack III version temperature-only Tracers, and the second is on all versions of Humidity
Tracers.
Both procedures depend on a simple procedure to guide the user through the process. The
guideline presents simple instructions to enter information and then automatically generates the
new calibration for the target Tracer. The instruction sets for both the temperature-only wizard
and the humidity are very similar in order to avoid user confusion.
Normally, if the instructions are followed and the calibration environment is stable and appropriate
there is no problem with the successful completion of the calibration procedure. However, if
problems are encountered, the last factory calibration can be restored by pressing the “Reset
Factory Calibration” button on the Calibration Information screen. The Reset Factory Calibration
button only becomes active if the target Tracer has received a field calibration since the last
factory calibration.
It is important to note that field calibration will invalidate the factory calibration certification that
was originally shipped with the Tracer. The best calibration results will be provided from a factory
calibration.
8.8.1. Temperature Tracer
The following instructions perform a temperature sensor recalibration on the DataTrace
®
Micropack III (MPIII) Tracer.