Hontzsch TA20 User Information

User's Information TA Probes
Supplementary to this User's Infor-
mation we refer to the correspond-
ing Technical Data Sheet with the
specific data relating to your order
and details of the Manual as well
as to Data Sheets Thermal Flow
Sensors TA and Flow Velocity
Calibration TA. The data in these
documents supplements the follow-
ing User's Information.

References to danger

•
Probe in pressurized pipeline:
- insertion or retraction of probe in
depressurized conditions only!
- In the case of probe guide pieces
with probe attachment
Ò
by TEFLON clamping bush:
increase the tension on the
clamping bush from time to time
(TEFLON runs causing the
clamping fixture to lose initial
gripping power)
•
Probe with probe guide piece: after
positioning a probe in the pipeline
fix the probe tube!

Probe alignment

Thermal flow sensors TA are to be
aligned in the direction of flow.

Fitting instructions

The probes should be so fitted that
• flow is according to the flow direc-
tion provided for.
Alignment estimated by sight does
not interfere with the measurement.
Rather more deviations from the
nominal position can however af-
fect the measurement.
In the case of probes with connec-
tion housing the screwed cable
gland on the connection housing is
to be aligned to the direction of
flow.
In the case of probes without con-
nection housing an adjustable 'di-
rection indicator' can be used to
determine the sensor flow direction
and insertion depth.
TA20
Flow direction
•
the probe mounting device does
not affect the flow if possible.
•
no drops hit the sensor. A moisten-
ing of the sensor with non-drip oil
does not affect the measurement.
•
they are fitted vibration-free and
not in the immediate vicinity of
electromagnetic or thermal sources
of interference. The T response
95
time of all TA sensors of air veloci-
ties of around 5 Nm/s is approx.
10 s. The response time decreases
at higher velocities. Changes in the
medium temperature result in an
exact measured value only then,
when the surroundings of the TA
sensor are again in thermal equilib-
rium.
1 of 4
CaTeC
0174 272330
info@catec.nl
www.catec.nl
TA10
Flow direction
Version '98

Probe fitting position

The probe fitting position of TA10
sensors can be chosen at random.
TA20 sensors should not be fitted
vertically from above ±30° in a
pipeline for avoidance of measured
convective flow at zero flow.
no
no
In the case of the TA20 flow sen-
sors, in supply since around 1/98,
no requirements regarding the fit-
ting position for avoidance of
measured convective flow at zero
flow to be heeded.
0174 272340
no