6
User Manual EE074 Temperature Probe with Modbus RTU
4.2 Duct Mount
The probe can be installed also into a duct using the plastics flange
HA401101 (not included in the scope of supply, see data sheet
“Accessories”).
4.3 Immersion Well Mount
The probe can be installed into a pressured liquid system using an
ISO or NPT ½“ immersion well HA400101-04 or HA4000211-14
(not included in the scope of supply, see data sheet “Accessories”).
Please note:
For a good thermal connection between the probe and the immersion well, the use of a
thermal paste is recommended.
The EE074 can be used up to 15 bar (218 psi) with an E+E brass immersion well and with an E+E
stainless steel immersion well up to 25 bar (363 psi).
Please observe following maximum flow speed limitations for the E+E immersion wells:
Length (L)
50 mm
(1.97“)
100 mm
(3.94“)
135 mm
(5.31“)
285 mm
(11.22“)
Brass
26 m/s
(5118 ft/min)
12 m/s
(2362 ft/min)
6 m/s
(1181 ft/min)
1 m/s
(197 ft/min)
Stainless steel
29 m/s
(5118 ft/min)
15 m/s
(2953 ft/min)
9 m/s
(1771 ft/min)
2 m/s
(394 ft/min)
4.4 Recommendations for Accurate Temperature Measurement
Air Temperature Measurement
In air, best accuracy is achieved with an air flow of min. 0.2 m/s surrounding the sample.
In case the EE074 probe is not entirely located in the environment to be monitored, large temperature
differences along the probe will lead to temperature gradients. These will have an influence on the
accuracy. Therefore, it is of paramount importance to minimize the temperature gradients. The biggest
part of the probe shall be located in the target environment and the rest shall be thermally well insula-
ted.
Air and Liquids Temperature Measurement down to -70 °C (-94 °F)
The front part of the 305 mm (12.07″) probe may be immersed up to 100 mm in a medium with a
temperature of down to -70 °C (-94 °F). The temperature of the other parts, especially those containing
the electronics, shall not fall below -40 °C (-40 °F). The insulation design depends on the measurement
task. In good thermal conductors like in liquids or dry block calibrators, the insulation can be smaller in
order to achieve a good measurement accuracy. In contrast, for media with low thermal conductivity like
air, the insulation must cover at least 200 mm (7.87″) of the remaining probe.
