Smart-Vue Pro Duo / Quatro User Guide
Using External Sensors | 19
Placing Smart-Sensors
Given the extreme temperature ranges typically handled by
Pt100 sensors, ensure to use the Pt100 compatible mounting
system provided with your freezer, oven, nitrogen tank or
other equipment.
The Smart-Vue Pro wireless monitoring system supports
different Pt100 temperature sensors, each one designed for a
different application and temperature range. Placement of
your Pt100 sensor(s) depends on the equipment you intend to
monitor. Non-exhaustive guidelines are provided in the
following sections.
Your equipment may be different than the description.
Contact the equipment manufacturer for instructions
regarding proper sensor placement.
Pt100 for Ultra-Low-Temperature
Freezers
Proceed with a thawed freezer while installing a Pt100 sensor
in an ultra-low-temperature (ULT) freezer.
Route the sensor through the same access port used by the
unit control sensor or an accessory port when required, as
shown in
It is recommend to install the sensor only after the freezer has
reached a thawed state while routing the Pt100 sensor
through the same port used by the control sensor.
To negate the possibility of condensation dripping onto
electronic components, avoid routing the cable in close
proximity to any electrical enclosures.
Mount the Pt100 sensor as close to the unit control sensor as
possible. It is recommend to mount the sensor within 5 cm
(2 inches) of the control sensor.
Avoid placing it in direct contact with the freezer wall while
mounting the Pt100 sensor. This will ensure the sensor is
mounted to permit measurement of air temperature only.
The Pt100which supports temperatures from -200 °C to
+ 50 °C may be placed inside the freezer. Make sure you
attach the sensor using the provided cable-ties and reseal
any openings you may have unsealed to insert the sensor
using Pergamum sealant.
Figure 19. Sample Pt100 (-100 °C to +150 °C) for
ULT freezer
Pt100 for Liquid Nitrogen and
Cryogenic Tanks
Pt100 sensors for LN
2
/cryogenic tanks must be mounted in
close proximity to the unit display sensor, whenever it is
applicable.
To avoid temperature measurement disparities, Thermo
Scientific recommends mounting the sensor at the same
height as the display sensor.
For example, some freezers have an access panel behind the
unit in which you may route the sensor cable up the back wall.
Place the cable under the tank gasket utilizing the notch at the
12 o’clock position. It is recommend to install Pergamum
sealant where the cable passes through the notch.
CAUTION:
In all cases described in this section,
the plastic connector joining the data logger and
the sensor must be in the same temperature
space as the data logger, not the sensor.
CAUTION:
When routing any sensor cable, avoid
direct cable contact with or close proximity to, any
high voltage wiring. Cabling should be placed at
least 5 cm (about 2 inches) from any high voltage
components. Avoid running the sensor cable
parallel to high voltage wiring.
CAUTION:
It is not recommended to install the
sensor through the door gasket on a ULT freezer.
This leads to excessive ice build-up and possible
door damage as well as longer compressor run
times that may result in other mechanical
problems.
Probe access port
