MESA LABORATORIES DataTrace MPIII, Стандартная операционная процедура, Страница: 22 / 32

MESA LABORATORIES, INC. DataTrace Division
Standard Operating Procedure
Release Date: August 27, 2010 Page: 22 of 32
Revision B

Dow 200 silicone fluid with a viscosity of 20 centistokes is recommended as the
medium in constant temperature baths for temperatures from 80°C to 150°C.
Silicone fluid should not be heated above 150°C for testing Tracers.
B. The standard used should be accurate to 0.025°C or better and traceable to N.I.S.T.
The constant temperature baths should be installed, operated and maintained in
accordance with the bath manufacturer's instructions and with the Material Safety
Data Sheets (MSDS) s of the manufacturer of the silicone fluid.
The bathes shall be installed, operated and maintained in accordance with the
manufacturer's instructions.

Set up the bath or baths and allow them to stabilize at target temperature for 15
to 30 minutes.

Program the Tracers to be tested for 30 second intervals, starting approximately
15 minutes before they will be immersed into the baths or positioned in the oven.

Synchronize your computer clock with your time standard or wrist watch.

For LoTemp, Standard Temp, and MPIII Tracers to be tested in baths:
C. When placing Tracers into the bath, position their probe tips in such a way that when
they are submerged the tips will be at least 1” away from the bottom or sides of the
bath, and will be submerged at least 1½” below the fluid level. Tie wraps can be used
to help position the probe tips of flex Tracers probes.
Some custom length rigid probes do not fit into the baths. A bath lid should be used
that has holes appropriate for inserting the probes into the bath through the lid.
D. Cover the bath with the lid and insert the reference into the hole in the lid. Slide it in
to a level that places its tip near the middle of the bath. For best results try to position
the reference probe and the Tracer probes as close to each other as possible without
touching. Observe the minimum immersion depth for the reference probe.
E. After the Tracers have been immersed for 15 minutes and the temperature indicated
on the display of the reference probe has stabilized, record the indicated temperature
and time.
F. Repeat steps 1 through 3 for each additional temperature point.
G. Read Tracer and compare Tracer data to the time and reading from the reference
probe.
H. For High Temp Tracers to be tested in an isothermal block:
CAUTION: TEMPERATURES OVER 140°C WILL DAMAGE THE MPIII TRACER’S
ELECTRONICS AND BATTERY. TEMPERATURES OVER 150°C WILL DAMAGE
THE FRB TRACER’S ELECTRONICS AND BATTERY. USE A FACTORY
RECOMMENDED THERMAL PACK TO PROTECT THE TRACER’S
ELECTRONICS AND BATTERY.