Low threshold sensor for ventilation and clean rooms — SS 20.400/SS 23.400
Спецификация SS 20.400/SS 23.400
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
SS 20.400 – is a device with minimal response time, perfectly suited for safe use in clean rooms. These sensors measure not only air flow values but also the flow direction. This allows for proper monitoring of all clean zones, including local clean rooms (boxes). Additional measurement parameters also enable more precise air supply control. The sensor is capable of measuring flow values even at very low flow speeds (down to 0.05 m/s). This corresponds to a pressure difference of approximately 0.01 pascal. Flow direction information can be easily output as a relay or analog signal. The device has no moving parts and, thanks to its all-metal design, is GMP-compliant, making it fully cleanable. Due to its characteristics and ease of installation, the sensor can be used for monitoring laminar flows in clean rooms. The ATEX version of the SS 23.400 sensor (category 3G, zone 2) is ideal for use in explosive zones. Note that reducing pressure, especially during production stops, helps save electricity while maintaining the proper level of safety.
Determining air velocity and flow direction can also be useful in other industrial areas:
- Monitoring laminar flow in explosive zones, such as paint shops, RABS, and isolators;
- Measuring supplied air to prevent the formation of explosive atmospheres;
- Controlling the exhaust of contaminated air from premises and much more.
- Specifications
- Overall Drawing
- Connection diagram
- Applications
| Technical specifications of SS 20.400 and SS 23.400 ATEX sensors | |
| Unit of measurement | speed wN, normalized to standard conditions TN = 20 °C, pN = 101325 hPa |
| Measured media | clean air, nitrogen, other gases on request |
|
Speed measurement range |
0 … 1 / 2.5 / 5 / 10 / 20 m/s |
| Lower trigger threshold | 0.05 m/s |
| Speed measurement accuracy (basic version) | ± 3 % of measured value + (2 % FSO; min. 0.05 m/s1)) |
| Speed measurement accuracy (precision version) | ± 1 % of measured value + (2 % FSO; min. 0.04 m/s1)) |
| Reproducibility wN | ± 1.5% of measured value |
| Response time t90 wN | 0.01 … 10 s (adjustable), factory setting: 1 s |
| Operating temperature | 0 … + 60 °C |
| Storage temperature | -20 ... +85 °C |
| Sensitive element material | Aluminum AlMgSiPb, anodized |
| Probe material | Stainless steel D6 CrNiMoTi 1.4571 |
| Connector material | Stainless steel D6 CrNiMoTi 1.4571 |
| Operating humidity | up to 95 % relative humidity (no condensation) |
| Operating pressure | atmospheric (700 … 1300 hPa) |
| Power supply | 7.52) … 24 VDC + 10 % |
| Current consumption | standard < 35 mA (max. 160 mA with relay outputs) |
| Analog output | 0 … 10 V (RL > 10 kΩ) or 4 … 20 mA (RL < 300 Ω); short-circuit protection |
| Relay outputs | 2 open collectors, current limitation and short-circuit protection, adjustable channel 1 (OC1): direction or threshold value; Channel 2 (OC2): threshold value max. 26.4 VDC / 65 mA; Switching hysteresis 5 % of threshold value, min. ± 0.05 m/s |
| Electrical connection | M9 connector, threaded, 7-pin |
| Permissible cable length | max. 10 m (voltage output) max. 100 m (current output) |
| Orientation in space | any |
| Protection class | IP 66 / III |
| ATEX category (option) | 3G, Zone 2, (II 3G Ex nA II T4) |
| Probe length | 130 / 200 / 300 mm |
| Weight | max. approx. 60 g (at 300 mm length) |
1) under standard conditions
2) with current output; for voltage output – min. 12 V
Dimensions of the SS 20.400 sensor:
Dimensions of the explosion-proof SS 23.400 ATEX sensor:
| Connector | Pin Number | Designation | Function | Cable Color |
 |
1 | Power | Operating voltage UB | White |
| 2 | TXD | RS232 | Brown | |
| 3 | RXD | RS232 | Green | |
| 4 | OC1 | Relay output 1: flow direction or threshold value | Yellow | |
| 5 | OC2 | Relay output 2: threshold value | Gray | |
| 6 | Analogue | Output data on flow rate | Pink | |
| 7 | GND | Ground | Blue | |
| Shield | Electromechanical shielding | Mesh |
Connection of analog current output:
Connection of analog voltage output:
Connection of relay outputs:
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