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The principle of measurement is based on heat transport from an electrically heated body in ambient air dependent on the relative velocity between both.
Thermal flow sensors are primarily used for measuring the standard flow velocity Nv from which the standard volume flow and mass flow can be determined irrespective of pressure and temperature.
Höntzsch thermal flow sensors TA are able to measure not only the lowest but also high velocities and comply with all standards for industrial application: |
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chemical corrosion resistance |
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robust mechanical design |
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small dimensions |
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wide measuring range |
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long-time stability of measured values |
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high rate of measurement accuracy |
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| A combination of a thermal flow sensor TA and a suitable evaluation unit is necessary for successful measurement |
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| for measuring standard flow velocity, standard volume flow and temperature of medium |
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probe diameter 10 mm with thin-film sensor element |
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measuring range from 0.2 m/s...150 m/s |
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time constant approx. 1s |
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maximum working pressure: up to 15 bar |
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working temperature range: -10 °C...+140 °C |
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optional with certification for zone 0 or 1 |
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materials: stainless steel, polyimide, epoxy resin, glass |
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| Probe designs TA10 |
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| for measuring standard flow velocity, standard volume flow and temperature of the medium |
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probe diameter 20 mm with Pt100 sensor element |
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measuring range 0.08...60 m/s |
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time constant approx. 20 s |
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maximum working pressure: up to 10 bar |
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working temperature range: -10 °C...+240 °C |
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materials: stainless steel, epoxy resin, glass |
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can be sterilized |
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| Probe designs TA20 |
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Drawing ZG7a
extendable probe, for use with transducer U10 or
system instrument VT-TA |
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Drawing ZG8a
probe with connector box, e.g. for installation in
pipelines from Di 80 with probe guide pieces;
available on request with transducer U10
embedded in the connector box |
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Drawing ZG9a
probe with connector box and connecting flange
DN25 PN16, e.g. for installation in pipe lines from
Di 80 mm; available on request with transducer
U10 embedded in the connector box |
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| Accessories for thermal flow sensors |
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probe guide pieces for insertion of probes in
pipelines and ducts |
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probe extension tubes for deeper insertion
of probes where the standard probe
length is not sufficient |
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direction indicator for clamping onto the probe tube; may also be used
as a depth indicator |
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software UTACOM and programming
adapter for parameterizing
transducers for thermal flow sensors |
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| for measuring standard flow velocity, standard volume flow |
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Measuring tubes TA·Di.ZG1b with integrated
transducer U10a |
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Measuring tubes TA·Di.ZG2b with direct cable outlet for
connection to a hand-held HTA or a separate
transducer U10a |
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tubes in accordance with EN ISO 1127 / DIN 2463 |
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tube connections: external thread in accordance with
DIN 2999 |
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connection to tubes with Di 8 mm is with cutting ring
fitting for tubes 12x2 mm |
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input/output section: aspect ratio approx. 2/3 to 1/3 |
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| Measuring tube measurable value inside Ø[mm] |
Smallest
measurable
value
[Nm3/h] |
Terminal
value
[Nm3/h] |
| 8 |
0,04 |
11 / 22 |
| 16 |
0,14 |
43 / 86 |
| 21,6 |
0,26 |
79 / 158 |
| 27,2 |
0,42 |
125 / 250 |
| 35,9 |
0,73 |
219 / 438 |
| 41,8 |
0,99 |
296 / 592 |
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hand-held instrument with IP64 type of protection to which all Höntzsch TA
sensors with thin-film sensor element can be connected |
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high-contrast LCD liquid crystal display, measured value display 13 mm
high four-digit with decimal point as well as affiliated display unit, display of
duration of measurement in seconds 6 mm high, adjustment and
configuration instructions, operator's information, status display 3 mm high |
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Schnittstelle zur direkten Übergabe der gespeicherten Messwerte
an einen PC |
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instantaneous values every second. Display of standard velocity v,
standard volume flow V/t or temperature (resolution 1 °C), selectable.
Display of instantaneous value in the START and also START/STOP mode also
with long-term measurement. Display units: m/s, m³/h, l/min, °C |
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power supply by 9 V compound battery, running time approx. 50 hours |
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power supply by 9V battery or plug-in power supply |
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analog output 0 . 4 V = 0 . x m/s |
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data and measured value storage for 500 data records. When being stored
the data records are automatically marked with a group number (max. 99)
and serial number |
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optional accessories: RS232 / V24 adapter for data transmission to an IBM
compatible PC / µP-Flowtherm extension cable 3 m or 5 m long, also with
waterproof connector / µP-Flowtherm Y cable for connection to two sensors at the input of the µP-Flowtherm / µP-Flowtherm carrying case / µP-
Flowtherm light metal carrying case / 9 V battery |
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hand-held instrument in ATEX EEx ia IIC T4 type of protection to which all
Höntzsch TA sensors with thin-film sensor element can be connected |
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high-contrast LCD liquid crystal display, measured value display 13 mm high
four-digit with decimal point as well as affiliated display unit, display of
duration of measurement in seconds 6 mm high, adjustment and
configuration instructions, operator's information, status displays 3 mm high |
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interface for direct transfer of the stored measured values to a PC |
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instantaneous values every second. Display of standard velocity v, standard
volume flow V/t or temperature (resolution 0.1 °C), selectable. Display of
instantaneous value in the START and also START/STOP mode also with long
term measurement. Display units: m/s, m³/h, l/min, °C |
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power supply by Li-Ion accumulator. Charge by using the appropriate
charger in the 6-pin flange socket. Charging time approx. 4 hours, running
time approx. 50 hours |
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analog output 0 . 4 V = 0 . x m/s |
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data and measured value storage for 500 data records. When being stored
the data records are automatically marked with a group number (max. 99)
and serial number |
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| Transducers U10 / U10a / U12-Ex / U15-Ex |
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Technical data for all transducers |
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analog output: 4-20 mA |
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pulse output (example: 1 pulse = 1 m³) |
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power supply: 24 VDC |
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serial interface RS232 for configuring and transmission of data |
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variable time constant 1.99 s |
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U10a: for thermal flow sensors TA10 / TA Di with thin-film sensor element. With probe designs ZG2b or measuring
tubes ZG1b the transducer is embedded in the connector box |
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U10: for thermal flow sensors TA20 / TA Di with Pt100 sensor elements |
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U12-Ex: transducer embedded in the connector box and with EEx e q [ia] IIC T5 type of protection for zone 1 for
thermal flow sensors TA10 / TA Di with thin-film sensor element |
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U15-Ex: separate transducer in AS080 housing for supplying power to flow sensors TA10 / TA Di in potentially
explosive atmospheres in zone 0 |
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| LCD display for transducers U10 / U10a / U15-Ex |
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double-spaced LCD display |
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display of instantaneous values of velocity in m/s or volume flow in m³/h |
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resettable quantity meter |
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Systemgeräte mit Anzeige und Tastatur für Sonden TA20 und Messrohre TA·Di ... |
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for connection of thermal flow sensors TA with Pt100 sensor elements |
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analog output flow: 0/4-20 mA, 0-5 V, 0-10 V, optional |
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optional RS232/V24 output (not in LDG30 housing, see below) |
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optional relay output for quantity impulse |
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power supply: 230 VAC, 24 VAC, 24 VDC; optional; in the case of system instruments in free-standing housing Ti-SRF
also choice of supply by accumulator |
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housing variants as illustrated below |
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software options: quantity measurement, long-term measurement, limit value, password, data logger, Nv, etc. |
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multi-channel instruments and special designs on request |
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| system instruments VT-TA for connection of thermal flow sensors TA |
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LDG30: miniature housing W/H/D = 100/75/110 mm for 35 mm standard assembly rails |
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Wa-IP65: wall -mounted W/H/D = 306/241/264 mm |
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Ti-SRF: free-standing W/H/D =365/155/315 mm |
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19”3HE: slide-in housing W/H/D = 443/133/317 mm |
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