Vaisala HMP240 - Manual (Page 13)

HMP240 series
M210300en User's Guide
11
3.2.2 Mounting the HMP247
HMP247 has a small size probe made of stainless steel. The sensor head
withstands temperatures -40...180 ºC (-40...356 ºF) and pressure up to 10 bar
(1MPa, 145 psi). The probe is suitable for applications where a mechanically
very durable leak proof probe is needed.
Pressure tight installations
A pressure tight installation can be done by using a probe head installation or
cable installation. Vaisala's cable gland HMP247CG is recommended for the
humidity probe's cable installation.
The different pressure tight installations of the HMP247 are shown in the
following pictures. In cases where the probe shall be positioned horizontally in
the measuring chamber (or in duct) a supportive thread bar set HMP247TBS
can be ordered from Vaisala (order code: HMP247TBS).
A) Probe head installation
1. Make hole with M20x1.5 thread
in the measurement chamber or
process wall. The smoothness of
the thread circle should be
R= 6.3 microm.
2. Install the cable gland
(EN50262, version A, example:
AGRO 1160.20.145) on the thread
of the process wall.
3. Push the probe through the
gland so deep that the backside of
the probe is flust with the cable
gland nut.
4. Tighten the cable gland nut,
the probe will lift up slightly.
Figure 3.4 HMP247 Pressure tight installations A) Probe head installation
B) Cable installation (cable gland: HMP247CG) .
A) Pipe fitting
∅30/M20x1.5x13.5
B) Cable
installation with
Vaisala's
HMP247CG
Process pressure <
10 bar, temperature
according to the
cable's sealing
B) Cable
installation with
Vaisala's
HMP247CG
∅13.6 mm ∅ 5.3 mm