SCHMIDT® Flow Sensor SS 20.260

Chamber head (fast response time)
Flow and temperature signal (optional)
Probe length 50 … 500 mm
Measuring ranges 0 … 10 m/s to 0 … 60 m/s
Temperature range +120 °C

SCHMIDT Technology offers a price sensitive flow sensor under the designation SS 20.260, which is characterised by its compact and rugged design. With a measuring range up to 60 m/s and its linear output signal, it is an universal sensor for measuring flow velocity, volume flow or mass flow under atmospheric conditions. The sensor element is well protected against mechanical stress by the impact resistant chamber head. Via two LEDs, the sensor indicates whether the supply voltage is sufficient and if it works properly.

Industrial processes
Flow measurement in air ducts
Control of the combustion air in oil, coal, wood or gas burners
Ventilation and air conditioning
Flow control in cooling and drying systems

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 (optional)
Measured medium	Air or nitrogen, other gases upon request
Measuring range w_N	0 … 2.5 / 10 / 20 / 40 / 50 / 60 m/s
Lower detection limit w_N	0.2 m/s
Measuring range T_M (optional)	-20 … +120 °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)
Temperature gradient w_N	< 8 K/min (at w_N = 5 m/s in air)
T_M (w_N > 2 m/s)	±1 K (0 … 40 °C) ±2 K (remaining measuring range)
Operating temperature
Sensor probe	-20 … +120 °C
Electronics	0 … +70 °C
Storage temperature	-20 … +85 °C
Material
Sensor head	Platinum element (glass passivated); PPO/PA
Sensor tube	Stainless steel 1.4571
Enclosure	PBT (glass-fibre reinforced)
Sensor cable	PVC
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Display	LED green: Operating status LED red (flashing): Sensor defective
Supply voltage	24 V DC ± 10 %
Current consumption	< 60 mA
Analog output	Short circuit protected; load capacity C_L ≤ 10 nF
- Standard: w_N	1 x 0 … 10 V (R_L ≥ 10 kΩ) or 4 … 20 mA (R_L ≤ 300 Ω)
- Option: w_N and T_M	2 x 4 … 20 mA (R_L ≤ 300 Ω)
Electrical connection	Non-detachable cable, , 4 x 0,14 mm², with ferrules: - Standard: Length 2 m - Special length: 3 … 100 m (step: 1 m)
Maximum cable length	Voltage interface: 15 m; current interface: 100 m
Mounting position	Arbitrary
Mounting tolerance	±3° relative to flow direction (unidirectional)
Protection type	Sensor probe: IP66; enclosure: IP54
Protection class	III (SELV) or PELV (EN 50178)
Probe length	50/100/200/350/500 mm
Weight	200 g max.

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 without temperature output	SCHMIDT^® Flow Sensor SS 20.260; 1 x output signal 4 … 20 mA or 0 … 10 V; cable length 2 m	506 690-1	X	Y	Z	K	A
	Options
Mechanical type	Probe length 50 mm		1
	Probe length 100 mm		2
	Probe length 200 mm		3
	Probe length 350 mm		4
	Probe length 500 mm		5
Measuring range, adjustment accuracy and calibration	Measuring range 0 … 1 m/s			1
	Measuring range 0 … 10 m/s			2
	Measuring range 0 … 20 m/s			3
	Measuring range 0 … 40 m/s			4
	Standard adjustment				1
	Standard adjustment with factory calibration certificate				3
	High precision adjustment flow with factory calibration certificate				2
Output signals	0 … 10 V					1
Output signals	4 … 20 mA					2
Connecting cable	Cable length 2 m						1
Connecting cable	Special length: 3 ... 100 m; 1 m steps						9

	Description	Article-Number
Basic sensor with temperature output	SCHMIDT^® Flow Sensor SS 20.260; 2 x output siganls 4 … 20 mA; cable length 2 m	506 690-2	X	Y	Z	4	A
	Optionen
Mechanical type	Probe length 50 mm		1
	Probe length 100 mm		2
	Probe length 200 mm		3
	Probe length 350 mm		4
	Probe length 500 mm		5
Measuring range and adjustment	Measuring range 0 … 10 m/s			2
	Measuring range 0 … 20 m/s			3
	Measuring range 0 … 40 m/s			4
	Measuring range 0 … 50 m/s			5
	Measuring range 0 … 60 m/s			6
	Standard adjustment				1
	Standard adjustment with factory calibration certificate				3
	High precision adjustment with factory calibration certificate				2
Connecting cable	Cable length 2 m						1
Connecting cable	Special length: 3 … 100 m; 1 m steps						9

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, galvanized steel	301 048
Compression fitting, brass, G½, atmospheric pressure	517 206
Welding sleeve, stainless steel, G½, according to EN 10241, 2 pieces	524 882
Press fitting, stainless steel, G½, atmospheric pressure	539 746
Welding sleeve steel, G½, according to EN 10241, 5 pieces	524 916
Assembly kit for pipe assembly suitable for MD 10.010/10.015, including pipe clamps and collar for adjustment to pipe diamter	531 394

Measured value display

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