SCHMIDT® Flow Sensor SS 20.225

A small all-rounder – universal and powerful

Dumb-bell head (largely independent from flow direction, easy to clean)
Flow velocity and temperature signal
Probe length 100 … 500 mm
Measuring ranges 0 … 1 / 2.5 / 10 / 20 m/s
Optional coated (PU, black)

In many applications, the direct measurement of flow velocity and volume flow in air and gases is the ideal solution. Due to the high demands of modern control technology, the flow sensor has to measure precisely and fast an extremely wide measuring range from "almost zero" up to the maximum value.

Energy-efficient control of ventilators
Monitoring filter units
Regulation and control of flow rate for extraction systems
Industrial processes

Successor product for SS 20.015 and SS 20.016 (coated version but not pressure-resistant)

SCHMIDT Technology – Simply a question of better measurement

Specifications

Technical data
Measuring quantity	Standard flow velocity w_N, based on standard conditions ¹⁾ Temperature of medium T_M
Measured medium	Air or nitrogen, other gases upon request
Measuring range flow w_N	0 … 1 / 2.5 / 10 / 20 m/s
Lower detection limit flow w_N	0.06 m/s
Measuring range temperature T_M	-20 … +70 °C
Measuring accuracy
Standard w_N	±(5 % of measured value + [0.4 % of fmr; min 0.02 m/s]) ²⁾
High precision (optional) w_N	±(3 % of measured value + [0.4 % of fmr; min 0.02 m/s]) ²⁾
Response time (t₉₀) w_N	3 s (jump from 0 to 5 m/s in air)
Temperature gradient w_N	< 2 K/min (at w_N = 5 m/s in air)
T_M (w_N > 1 m/s)	±1 K (10 … 30 °C); ±2 K (remaining measuring range)
Operating temperature
Sensor and electronics	-20 … +70 °C
Storage temperature	-30 … +85 °C
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure	Atmospheric (700 … 1,300 hPa)
Display	LED green: Operating status LED red (flashing): sensor defective
Supply voltage	24 V DC ± 10 %
Current consumption	Typ. < 60 mA (max. 100 mA)
Analog outputs for w_N and T_M	0 … 10 V (R_L ≥ 10 kΩ, short circuit protected; C_L ≤ 10 nF)
Electrical connection	Standard: Non-detachable cable, 4 wires, length 2 m Special cable length (option): 3 … 15 m (steps of 1 m)
Maximum cable length	15 m
Mounting position	Arbitrary
Minimum immersion depth	58 mm (< 58 mm upon request)
Protection type	Sensor head: IP67; enclosure: IP65
Protection class	III (SELV or PELV)
Probe length	100/200/350/500 mm
Weight	Approx. 100 g (L = 350 mm)
Material
Sensor tube	Stainless steel 1.4571
Sensor head	PBT (glass-fiber-reinforced), stainless steel 1.4571
Protective coating (optional)	Polyurethan (PU)
Sensor cable	PVC
Housing	PBT (glass-fiber-reinforced)

¹⁾ Standard conditions: T_N = 20 °C and p_N = 1,013.25 hPa

²⁾ Related to adjustment reference; "fmr" = final measuring range

Subject to technical changes.

Order information

	Description	Article-Number
Basic sensor	SCHMIDT^® Flow Sensor SS 20.225; 2 x output signal 0 … 10 V; cable length 2 m	567 920-	T	X	Y	Z	P	A
	Options
Type	Standard		1
Mechanical type	Sensor length 100 mm			1
	Sensor length 200 mm			2
	Sensor length 350 mm			3
	Sensor length 500 mm			4
Measuring range, adjustment accuracy and calibration	Mesuring range 0 … 1 m/s				1
	Mesuring range 0 … 2.5 m/s				2
	Mesuring range 0 … 10 m/s				3
	Mesuring range 0 … 20 m/s				4
	Standard adjustment					1
	Standard adjustment with factory calibration certificate					2
	High-precision flow adjustment, including factory calibration certificate					3
Protection type	Without protective coating						1
Protection type	With protactive coating (Polyurethan derivate, PU black)						2
Connecting cable	Cable length 2.0 m							1
Connecting cable	Special cable length: 3 ... 15 m; 1 m steps							2

Accessories

Connection technology

Description	Article-Number
Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal)	535 282

Mounting and fixing technology

Description	Article-Number
Mounting flange steel, galvanic zinc-plated	301 048
Compression fitting stainless steel G½, atmospheric pressure	532 160
Compression fitting brass G½, atmospheric pressure	517 206
Welded sleeve steel G½, according to EN 10241, 5 pieces	524 916
Welded sleeve stainless steel 1.4571 G½, according to EN 10241, 2 pieces	524 882
Adapter M18 x 1, G½	545 090
Assembly kit for pipe assembly suitable for MD 10.010/10.015, including pipe clamps and collar for adjustment for the pipe diameter	531 394

Measured value display

Description	Article-Number
SCHMIDT® LED display MD 10.010, in wall housing to show the volume flow velocity, 85 … 250 V AC and sensor power supply	527 320
SCHMIDT® LED display MD 10.010, similar to 527320 but with 24 V DC voltage supply	528 240
SCHMIDT® LED display MD 10.015, similar to 527320 but with additional sum function and second measuring input	527 330
SCHMIDT® LED display MD 10.015, similar to 527330 but with 24 V DC voltage supply	528 250

Miscellaneous

Description	Article-Number
Attachable protective clip for dumbbell head against mechanical influences, stainless steel	531 026
Attachable protective 2-wires-clip for protection against mechanical influences, stainless steel, H₂O₂-resistant	559 124