Sensor with Analog and Relay Outputs for Monitoring Laminar Flows — SS 20.415 LED
Спецификация SS 20.415 LED
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
The SS 20.415 LED sensor is designed to monitor the condition of laminar flows in clean rooms. The purpose of directed air flows in clean rooms is to protect products from contamination and eliminate unwanted particles.
According to the EN ISO 14644 - 3 standard, air flow velocity measurement is carried out at a distance of about 150-300 mm below the front surface of the filter. For ceiling or wall mounting, SCHMIDT® SS 20.415 LED sensors are supplied with a special set of fasteners for use in clean rooms. The compact size of the device, with all electronic components integrated into a small probe, helps maintain a low turbulence flow condition. For use in supply air systems, there is an option for simultaneous flow direction detection by the SS 20.415 LED sensor, which can be especially useful in case of possible reverse flow.
One of the features of the sensors is compensation and calibration in the new "vertically directed flow chamber." This allows achieving higher accuracy levels. The reference measurement system used is the laser Doppler anemometry (LDA) method. Upon request, sensors are additionally supplied with a high-precision calibration system, which provides even higher accuracy by using a greater number of calibration points, and also outputs an ISO report with specified target and actual values. Calibration can be repeated based on user-defined technical specifications.
Special mounting options simplify installation in clean rooms, and convenient fasteners allow easy and quick replacement.
Advantages
- Can be disinfected with alcohol or H2O2 (protection against VHP);
- Flow measurement even at minimal speeds of 0.05 and/or 0.06 m/s;
- Built-in device status monitoring and error signal transmission;
- Non-standard length up to 1,000 mm (straight design).
- Specifications
- Overall Drawing
- Connection diagram
- Applications
| Technical specifications of sensor SS 20.415 | |
| Unit of measurement | speed wN, normalized to standard conditions TN = 20 °C, pN = 1,013.25 hPa |
| Measured media | clean air, nitrogen, other gases on request |
|
Speed measurement range |
0 … 1 / 2.5 / 10 m/s |
|
Max. displayed range wN |
+ 10 % of the measurement range |
| Lower trigger threshold | 0.05 m/s |
| Speed measurement accuracy (basic version) | ± (3% of measured value + 0.05 m/s)1) |
| Speed measurement accuracy (precision version) | ± (1% of measured value + 0.04 m/s)1) |
| Reproducibility wN | ± 1.5% of measured value |
| Response time t90 wN | 0.01 … 10 s (adjustable), factory setting: 1 s |
| Temperature gradient wN | < 2 K/min at 5 m/s |
| Operating temperature | 0 … + 60 °C |
| Storage temperature | -20 ... +85 °C |
| Sensitive element material | Anodized aluminum |
| Probe material | Stainless steel 1.4404 |
| Connector material | Stainless steel 1.4404 |
| Operating humidity | up to 95 % relative humidity (without condensation) |
| Operating pressure | atmospheric (700 … 1300 hPa) |
| Power supply | standard 24 VDC (12 … 26.4 VDC) |
| Current consumption | standard 30 mA / max. 150 mA |
| Analog output | 0 … 10 V (RL ≥ 10 kOhm) or 4 … 20 mA / max. 21.6 mA (RL ≤ 300 Ohm); short circuit protection |
| Relay outputs | 2 open collectors, current limitation and short circuit protection (≤ 26.4 V DC / 65 mA), adjustable; channel 1 (OC1): direction or threshold value channel 2 (OC2): threshold value switching hysteresis 5 % of threshold value, min. ± 0.05 m/s |
| Error message | Only with 4 … 20 mA output: 2 mA (according to NAMUR NE43 specification) |
| Electrical connection | M9 connector, threaded, 7-pin |
| Permissible cable length | max. 15 m (voltage output) max. 100 m (current output) |
| Orientation in space | position in downward flow |
| Protection class | IP 65 / III |
| Probe length | Angular version: 270 x 300 mm Straight version: 300 mm or user-defined (up to 1000 mm) |
| Weight | approximately 200 g (angular version) |
1) under standard conditions
Direct version of the SS 20.415 sensor:
Angular version of the SS 20.415 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 | Flow rate output data | 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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