Thermal gas mass flow meter is designed on the basis of thermal dispersion, and adopts method of
constant differential temperature to measuring gas flow. It has advantages of small size, easy installation,
high reliability and high accuracy, etc.
The meter contains two platinum resistance temperature sensors. The thermal principle operates by
monitoring the cooling effect of a gas stream as it passes over a heated sensor. Gas flowing through the
sensing section passes over two sensors one of which is used conventionally as a temperature sensor,
whilst the other is used as a heater. The temperature sensor monitors the actual process values whilst
the heater is maintained at a constant differential temperature above this by varying the power consumed
by the sensor. The greater the gas velocity, the greater the cooling effect and power required to maintain
the differential temperature. The measured heater power is therefore a measure of the gas mass flow
rate.
The format of gas velocity and power is shown as below:
��(1)
Where: is specific gravity of medium
V is velocity
K is balance coefficient
Q is heater power
Î? T is differential temperature
The medium temperature range of meter is -40ï½?220.
In the format (1), the specific gravity of medium is related to the density:
��(2)
Where: is the medium density in working conditionkg/m3
�n is the medium density in standard condition, 101.325kPa and 20 kg/m3
P is the pressure in working conditionkPa
T is the temperature in working condition
In the formats (1) and (2), there is a certain functional relationship between the velocity and pressure in
working condition, medium density, the temperature in working condition.
Due to the sensor temperature is always 30 higher than the medium temperature (environment
temperature), and the meter adopts method of constant differential temperature, therefore the meter do
not need to do temperature and pressure compensation in principle
Features:
1. Miniature s type tension load cells are small and it is easy to install them.
2. The load cells with fully sealed structure offer good water resistance and high dynamic frequency.
3. The load cells are made of stainless steel and provide robust construction.
4. The load cells utilize strain gauge technology and provide high dynamic frequency
Applications:
Miniature compression and tension load cells are mainly applied in tension and pressure testing instruments, automatic equipments, and testing fields, such as insertion force test instruments, riveting machine, welding machine, hot & cold lamination machine, feeling tester for keyboard switch, and etc.
Technical specification:
Rated output
2.0/3.0 ± 10% mv / v
Zero balance
±2 % f.S.
Non-linearity
0.05% f.S.
Hysteresis
0.05% f.S.
Repeatability
0.05% f.S.
Creep (30min)
0.05% f.S.
Temp. Effect on output
0.03% f.S. / 10ºc
Temp. Effect on zero
0.03% f.S. / 10ºc
Input impedance
385±5
Output impedance
350±3
Insulation resistance
5000m/100vdc
Recommended excitation
5-10v
Maximum excitation
15 v
Compensated temp range
- 10 ~ 60 ºc
Operation temp range
- 20 ~ 80ºc
Safe overload
150%
Ultimate overload
200 %
Cable size
53m
Wiring
Red: + excitation black: - excitation
Green: + signal white: - signal.
1. Miniature s type tension load cells are small and it is easy to install them.
2. The load cells with fully sealed structure offer good water resistance and high dynamic frequency.
3. The load cells are made of stainless steel and provide robust construction.
4. The load cells utilize strain gauge technology and provide high dynamic frequency
Applications:
Miniature compression and tension load cells are mainly applied in tension and pressure testing instruments, automatic equipments, and testing fields, such as insertion force test instruments, riveting machine, welding machine, hot & cold lamination machine, feeling tester for keyboard switch, and etc.
Technical specification:
Rated output
2.0 â± 10% mv / v
Zero balance
±2 % f.S.
Non-linearity
0.05% f.S.
Hysteresis
0.05% f.S.
Repeatability
0.05% f.S.
Creep (30min)
0.05% f.S.
Temp. Effect on output
0.03% f.S. / 10âºc
Temp. Effect on zero
0.03% f.S. / 10âºc
Input impedance
350â±5,
Output impedance
350â±5,
Insulation resistance
5000m, /100vdc
Recommended excitation
5-10v
Maximum excitation
15 v
Compensated temp range
- 10 ~ 60 âºc
Operation temp range
- 20 ~ 80âºc
Safe overload
120%
Ultimate overload
150 %
Cable size
Ã?4ã?3m
Wiring
Red: + excitation black: - excitation
Green: + signal white: - signal.
Features:
1. Miniature S type Tension Load Cells are small and it is easy to install them.
2. The load cells with fully sealed structure offer good water resistance and high dynamic frequency.
3. The load cells are made of stainless steel and provide robust construction.
4. The load cells utilize strain gauge technology and provide high dynamic frequency
Applications:
Miniature Compression and Tension Load Cells are mainly applied in tension and pressure testing instruments, automatic equipments, and testing fields, such as insertion force test instruments, riveting machine, welding machine, hot & cold lamination machine, feeling tester for keyboard switch, and etc.
Features:
1. Miniature S type Tension Load Cells are small and it is easy to install them.
2. The load cells with fully sealed structure offer good water resistance and high dynamic frequency.
3. The load cells are made of stainless steel and provide robust construction.
4. The load cells utilize strain gauge technology and provide high dynamic frequency
Applications:
Miniature Compression and Tension Load Cells are mainly applied in tension and pressure testing instruments, automatic equipments, and testing fields, such as insertion force test instruments, riveting machine, welding machine, hot & cold lamination machine, feeling tester for keyboard switch, and etc.
Main functions:
1) Special T-type signal input port, compatible with normal sensors/recoilers with T-type plug
2) T-type socket could turn 360 degree rotation freely.
3) It has a signal detection switch.
4) It offers a MINI USB charging port.
5) Contact charging (put-on-base-charging) way
6) Rechargeable lithium battery built inside.
7) Standby time of 7 days or 1 year for your options.
8) LED light indication for different alarm position
9) It has power switch to turn off power when put in warehouse.
10) It has low battery indication and external power connection/disconnection indication
11) It has password modification function for IR remote key, and RESET button.
12) Alarm volume is above 95db±5%..
13) It could use with TIMING clamp to secure mobile phones/tablets better.
14) It is compatible with DP1155 wall display holder and DA1850 desktop display holder.
15) It offers a 3M adhesive tape.
Parameters;
1) product size: 60x37x22mm.
2) Alarm volume: 95db.
3) Standby time: 7 days or 1 year for options.
4) Charging output: MINI USB.
5) External power and signal input port: T type.
6) Maximum charging current: 4A.
Main functions:
1) Special T-type signal input port, compatible with normal sensors/recoilers with T-type plug
2) T-type socket could turn 360 degree rotation freely.
3) It has a signal detection switch.
4) It offers a MINI USB charging port.
5) Contact charging (put-on-base-charging) way
6) Rechargeable lithium battery built inside.
7) Standby time of 7 days or 1 year for your options.
8) LED light indication for different alarm position
9) It has power switch to turn off power when put in warehouse.
10) It has low battery indication and external power connection/disconnection indication
11) It has password modification function for IR remote key, and RESET button.
12) Alarm volume is above 95db±5%..
13) It could use with TIMING clamp to secure mobile phones/tablets better.
14) It is compatible with DP1155 wall display holder and DA1850 desktop display holder.
15) It offers a 3M adhesive tape.
Parameters;
1) product size: 60x37x22mm.
2) Alarm volume: 95db.
3) Standby time: 7 days or 1 year for options.
4) Charging output: MINI USB.
5) External power and signal input port: T type.
6) Maximum charging current: 4A.
Main functions:
1) RJ11 or USB plug spring cable, compatible with normal sensors
2) It has a signal detection switch.
3) It offers a MINI USB charging port.
4) Rechargeable lithium battery built inside.
5) Standby time of 7 days or 1 year for your options.
6) LED light indication for different alarm position
7) It has power switch to turn off power when put in warehouse.
8) It has low battery indication and external power connection/disconnection indication
9) It has password modification function for IR remote key, and RESET button.
10) Alarm volume is above 95db±5%..
11) It could use with TIMING clamp to secure mobile phones/tablets better.
12) It is compatible with DP1128 wall display holder, DA1880, DA1852, DA1838 and DA1879 desktop display holder.
13) It offers a 3M adhesive tape.
Parameters;
1) product size: 50X32X18mm.
2) Alarm volume: 95db.
3) Standby time: 7 days or 1 year for options.
4) Charging output: MINI USB.
5) External power and signal input port: RJ11 or USB.
6) Length of spring cable: 17cm with 1.5m extension maximum.
7) Maximum charging current: 2A.
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