Flow sensor for high-temperature air and gases — SS 20.651
Спецификация SS 20.651
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
Measurement of flow velocity and/or flow rate at high temperatures up to +350° is extremely important in many areas of production. The requirements for a stationary sensor are very high. Key parameters when choosing a device may include: mechanical strength, accurate and stable measurement, ease of installation, a wide range of measurable values, and the ability to measure temperature. The SS 20.651 flow sensor meets all these requirements. Measuring gas flow at high temperatures can be relevant in the following industrial sectors:
Combustion control in industrial furnaces
Innovative ceramic products are increasingly used in the medical, automotive, and environmental industries. These products have diverse requirements, and one of the conditions for their fulfillment is the proper execution of firing processes. The SCHMIDT® SS 20.651 sensor is specially designed for measuring combustion air at temperatures up to +350°. Direct flow measurement without additional sensors
ensures stoichiometric accuracy during combustion.
Drying process monitoring
In coating technologies, drying processes play an important role in improving product quality and avoiding defects. The SS 20.651 flow meter allows control of the drying process by regulating air flow. Simultaneous temperature measurement also plays an important role. Another advantage of these sensors is the lack of maintenance requirements, which can be important since the devices are often installed in areas with limited access.
Air compressor control &
- Specifications
- Overall dimensions drawing
- Connection diagram
- Applications
| Technical Specifications SS 20.651 | |
| Unit of measurement | Speed wN, normalized to standard conditions, TN = 20 °C and pN = 1013.25 hPa |
| Measured medium | Air, nitrogen, other gases on request |
| Measuring range wN |
0 … 2.5 / 10 / 20 / 40 / 60 m/s |
| Lower trigger threshold wN | 0.2 m/s at 20 °C |
| Measurement range TM | 0 … +200 / +350 °C |
| Accuracy (standard version) | ±(3% of measured value + 0.4 % of measured range)1 |
| Accuracy (precision version) | ±(1% of measured value + 0.4 % of measured range)1 |
| Response time t90 | 3 s (step from 0 to 5 m/s) |
| Temperature gradient | < 8 K/min at wN = 5 m/s |
| Recovery time | < 10 s after temperature change Δϑ = 40 K at wN = 5 m/s |
| Measurement error TM (at wN > 2 m/s) |
± 2 K (TM = 10 ... 30 °C) ± 4 K (in the remaining range) |
| Operating temperature for probe | 0 … +200 / +350 °C |
| Operating temperature of electronics | -20 ... +70 °C |
| Storage temperature | -20 ... +85 °C |
| Operating humidity | No condensation, high relative humidity combined with high temperature may lead to deviations in measurement results |
| Operating pressure | Atmospheric / 16 bar (overpressure) |
| Power supply voltage | 24 V DC ± 20 % |
|
Standard current consumption |
50 mA (max. 250 mA) |
| Indication | 4 x bicolor LEDs (green / red / orange) |
| Start-up time | About 10 s after power on |
| Protection class | IP 65 (housing), IP 54 (probe) / III (SELV) or PELV (EN 50178) |
| Analog outputs for temperature and flow Auto U / I |
0 … 10 V / 4 … 20 mA (short-circuit protection) Voltage output: ≥ 550 Ohm Current output: ≤ 500 Ohm Hysteresis: 50 Ohm Capacitive load: ≤ 10 nF |
| Pulse outputs | 1. Dry contact without galvanic isolation High level: > supply voltage - 3 V Short-circuit current limitation: 100 mA 2. Semiconductor relay (galvanic isolation); max. 30 V / 50 mA |
| Pulse output frequency | 0 ... 100 Hz or 1 pulse/m3, or freely selectable frequency (10 ... 100 Hz) |
| Digital protocols (option) | Profibus DP / DeviceNet |
| Electrical connection | M12 plug, 8-pin, threaded |
| Max. cable length | Voltage output signal: 15 m Current output / pulse output: 100 m |
| Installation position | Any (horizontal preferred at high pressure) |
| Permissible installation error | ± 3° to flow direction |
| Minimum pipe diameter | DN 20 (depends on medium temperature) |
| Max. weight | 750 g (version with communication module) |
| Probe length (L) | 250 / 400 / 600 / 1,000 mm (for either version) |
| Cable length (remote version) | Selectable: 1 ... 10 m (step 10 cm) |
| Housing material | Anodized aluminum |
| Probe material | Stainless steel 1.4571 |
| Compression fitting material | Stainless steel 1.4571 or brass (depending on sensor version) |
| Sensing element material | Platinum resistor element (glass passivated), ceramic |
1) Under standard conditions
Dimensions of the standard version:
Dimensions of the remote version:
Installation dimensions:
Dimensions of the version with communication
module:
|
Connector diagram |
Contact |
Designation |
Function |
Wire |
|
|
1 |
Pulse 1 |
Output flow signal (digital: pulse) |
White |
|
2 |
UB |
Operating voltage: 24 VDC ± 20% |
Brown |
|
|
3 |
Analog TM |
Output medium temperature signal |
Green |
|
|
4 |
Analog wN |
Output flow signal (analog: U / I) |
Yellow |
|
|
5 |
AGND |
Reference potential for analog outputs |
Gray |
|
|
6 |
Pulse 2 |
Galvanically isolated pulse output |
Pink |
|
|
7 |
GND |
Operating voltage: ground |
Blue |
|
|
8 |
Pulse 2 |
Galvanically isolated pulse output |
Red |
|
|
|
Shield |
Guide protrusion |
Mesh |
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