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4.5. Wiring
Note that the LCD based DTB is a battery powered
device and needs no wiring.
5. Limits
5.1. Pressure Limits
The pressure limits for the probe is 500 psig, but the
pressure limits for the process connection could be
considerably less. Ensure the appropriate process
connection is used for the desired pressure limits.
5.2. emperature Limits
The ambient temperature range for the exterior housing
enclosing the processor should not exceed 50ºC (120ºF ).
The temperature limits for the probe should conform to
the limits outlined in the technical specifications.
Note that the temperature will affect the pressure and
flow velocity limits of the probe.
5.3. hermal Characteristics
For some RTD temperature indicators there is self
heating from the measurement current. With the DTB
line of products, the self heating is negligible. Any self
heating error will be compensated for during factory
calibration.
Calibration of all DTB products takes place after the RTD,
probe and electronics are assembled and immersed up
to the process connection or a minimum of 10X the
probe diameter. There should be no discrepancy in the
measurement due to the thermal characteristics of the
probe or process fitting.
5.4. Response ime
Warm up is approximately 30 seconds, then response
time is typically 3 seconds due to the display refresh
rate.
6. Calibration
Calibration is performed at the factory. For recalibration
return the unit to the factory. Please ensure that the unit
is clean and free of contaminants before shipping. On
site calibration may only be conducted by factory trained
professionals.
7. Long- erm Stability
The electronics and RTD should not deviate more than
0.05% per year if sized and installed properly. Regularly
scheduled verification should be done to ensure that the
unit is within accepted norms.
The probe should be centered in the process flow no
matter what the orientation. Angled inserts should have
the probe pointing into the direction of flow as shown.
Ensure that during installation all necessary precautions
are taken. f this is a sanitary installation ensure that
the probe has been properly cleaned in advance of
installation and ensure that it is transported to the site
of installation in a way that will maintain it’s sanitary
condition.
⚠
f there are flammable or explosive fluids or gasses
present at the site of installation ensure that proper
grounding procedures are taken. Unwrapping a probe
from bubble wrap or other packaging can impart a static
charge on the probe which may discharge upon insertion
into the mounting location.
f the function demands it, seal the process connection
with PTFE tape.
Note: NPT connections should be hand tightened
and then turned only 1-1/2 turns further with an appropri-
ate wrench. This value may change according to what
type of sealant is used and the quality of the process
thread. Do not use the display body to tighten the probe
into the mounting location. Doing so may damage the
probe. Use only the lower hex portion of the process
fitting to tighten.
Note: Compression fittings of 1/4” (6mm ) and high-
er should be hand tightened and then turned only 1-1/4
turns further with an appropriate wrench. Compression
fittings of 3/16”(4mm) and lower should be hand tight-
ened and then turned only 3/4 of a turn further with an
appropriate wrench.
4.4. roubleshooting
f the unit fails to function properly there are no user ser-
viceable parts inside. f returning the unit to the factory
please ensure that the unit is clean and free from any
contaminants before shipping.
FF
Figure 1
