SCHMIDT Technology
Technical Data
Measuring quantity wN Standard flow velocity wN normalized to TN = 20 °C and pN = 1,013.25 hPa
Measuring fluid Air or nitrogen
Optional: natural gas, biogas, CO2, special gases and gas mixtures
Measuring range flow wN 0 … 10 / 20 / 60 / 90 / 140 / 220 m/s
Optional: customised measuring ranges in 0.1 m/s steps
Lower detection limit wN 0,2 m/s
Measuring range temperature TM SS 20.600: -20 … +120 °C
SS 20.600 EX: -40 … +120 °C
Accuracy
Standard wN ± 3 % of measured value + (0.4 % fmr; min. 0.08 m/s)*
High precision wN (option for air,
nitrogen, oxygen only)
± 1 % of measured value + (0,4 % fmr; min. 0,08 m/s)*
Repeatability wN ± 1 % of measured value
Response time (t90) wN 1 s (jump from 0 to 5 m/s air)
Temperature gradient wN < 8 K/min at wN = 5 m/s
Measurement accuracy temperature TM ± 1 K (10 … 30 °C); ± 2 K remaining measuring range (at wN > 5 m/s)
Operating temperature
Sensor SS 20.600: -20 … +120 °C
SS 20.600 EX: -40 … +120 °C
Electronics -20 … +70 °C
Storage temperature -20 … +85 °C
Material
Housing Aluminium, anodized
Sensor tube, screw connection Stainless steel 1.4571
Sensor head Platinum resistor element (glass-passivated), PPO / PA
Protective sleeve (ATEX-Option) Aluminium, anodized
Sensor cable
Jacket (PUR, halogen free, UL)
Allgemeine Daten
Medium, environment Non-condensing (up to 95 % rH)
Maximum pressure 16 bar or 40 bar
Display 4 x duo-LEDs green / red / orange
Supply voltage 24 V DC ± 20 %
Current intake Approx. 50 mA (without impulse outputs); max. 250 mA
Analogue outputs for
temperature and flow
(type: Auto U / I)
0 … 10 V / 4 … 20 mA (protected against short circuits)
Voltage output: ≥ 550 Ω
Current output: ≤ 500 Ω
Hysteresis: 50 Ω
Impulse outputs Frequency wN / 0 … 100 Hz
optional: 1 impulse / 1 m3; 1 Impulse / 0.1 m3; 1 impulse / 0.01 m3 (max. 100)
Impulse outputs 1. Highside driver to supply voltage (not galvanically isolated)
high level: > supply voltage - 3 V
2. Semiconductor relay (galvanically isolated) max. 30 V / 50 mA
Electrical connection Plug-in connector M 12, screwed, 8-pin, male
Maximum line length Voltage signal: 15 m, Current signal/ impulse: 100 m
Mounting position Any, (with vertical downdraft: lower limit of measuring range 2 m/s at 16 bar)
Installation tolerance ± 3° to the flow direction
Minimum immersion depth DN 25
Type/ class of protection Sensor: IP 67; housing: IP 65 / III or PELV
ATEX-category II 3G Ex nA ic IIC T4 Gc
Sensor length Compact sensor: 120 / 250 / 400 / 600 mm;
special lengths from 120 to 1,000 mm
Remoted: Sensor 120 / 250 / 400 / 600 mm
Cable: 1 … 10 m (in steps from 0.1 m)
Weight Approx. 500 g max. (without connection cable)

* under reference conditions, related to adjustment reference

Subject to technical changes.