SCHMIDT® Flow Sensor SS 20.651
| Technical Data | |
|---|---|
| Measuring quantity | Standard velocity wN based on standard conditions of TN = 20 °C and pN = 1,013.25 Media temperature TM |
| Medium to be measured | Clean air, nitrogen, other gases upon request |
| Measuring range flow wN | 0 … 10 / 20 / 40 / 60 m/s |
| Lower measuring range limit wN | 0.2 m/s @ 20 °C |
| Measurement accuracy | 0 … +200 / +350 °C |
| Measurement accuracy wN | Standard: ±3 % of measured value + (0.4 % of final value; min. 0.08 m/s 1) High precision: ±1 % of measured value + (0.4 % of final value; min. 0.08 m/s 1) |
| Response time (t90) wN | 3 s (jump from 0 to 5 m/s in air) |
| Temperature gradient wN | 8 K/min @ wN = 5 m/s |
| Recovery time | < 10 s after temperature change of ∆ϑ = 40 K @ wN = 5 m/s |
| Measurement accuracy TM (wM > 2 m/s) |
± 2 K (TM = 10 ... 30 °C) ± 4 K (remaining measuring range) |
| Operating temperature | |
| Sensor tip | 0 … +200 °C / +350 °C |
| Electronics | -20 … +70 °C |
| Storage temperature | -20 ... +85 °C |
| Humidity | Non-condensing, high relative air humidity in combination with high temperature can cause measurement deviations |
| Operating pressure | Atmospheric / 16 bar (over pressure) |
| Electronic data | |
| Supply voltage | 24 V DC ± 20 % |
| Current consumption | typ. 50 mA (max. 250 mA) |
| Display | 4 x Duo LEDs (green / red / orange) |
| Start up time | Approx. 10 s after switch-on |
| Type / class of protection | IP 65 (housing), IP 54 (probe) / III (SELV) or PELV (EN 50178) |
| Analogue outputs for temperature and flow rate Auto U / I |
0 … 10 V / 4 … 20 mA (protected against short circuits) Voltage output: ≥ 550 Ω Current output: ≤ 500 Ω Hysteresis: 50 Ω Load capacity: ≤ 10 nF |
| Impulse outputs | 1. Highside driver to supply voltage (not galvanically isolated) High level: > supply voltage - 3 V Short circuit current limitation: 100 mA 2. Semiconductor relay (galvanically isolated); max. 30 V / 50 mA |
| Frequency of digital outputs | 0 ... 100 Hz or 1 impulse / m3 or free selectable frequency (10 ... 100 Hz) |
| Feldbus (optional) | Profibus DP / DeviceNet |
| Electrical connection | Plug-in connector M 12, 8-pole, male, screwed |
| Maximum cable length | Voltage signal: 15 m Current signal / impulse: 100 m |
| Mounting position | Arbitrary (atmospheric; under higher pressure preferred horizontally) |
| Installation tolerance | ± 3° to flow direction |
| Weight | 550 g max. (400 mm input length), 800 g (field bus version) |
| Mounting tolerance | ±3° relative to flow direction |
| Minimum tube diameter | DN 20 (depending on media temperature) |
| Weight | 750 g max. (fieldbus version) |
| Probe length (L) | 250 / 400 / 600 / 1,000 mm (both versions) |
| Cable length (remote version) | Selectable: 1 ... 10 m (in steps of 10 cm) |
| Material | |
| Housing | Aluminium, anodized |
| Sensor tube | Stainless steel 1.4571 |
| Screw connection | Stainless steel 1.4571 or brass (depending on sensor option) |
| Sensor head | Platinum resistor element (glass-passivated), ceramics |
1) under reference conditions, related to adjustment reference
Subject to technical changes.
