SCHMIDT® Flow Sensor SS 20.250

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 / 10 / 20 m/s; Special measuring range inbetween 1 … 20 m/s (in steps of 0.1 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])
High precision (optional) w_N	± (3 % of measured value + [0.4 % of fmr; min 0.02 m/s])
Response time (t₉₀) w_N	3 s (jump from 0 to 5 m/s of air)
Temperature gradient w_N	< 2 K/min at 5 m/s
Temperature T_M (for w_N > 1 m/s)	± 1 K (10 … 30 °C); ± 2 K (remaining measuring range)
Operating temperature
Sensor	-20 … +70 °C
Electronics	-20 … +70 °C
Storage temperature	-30 … +85 °C
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Display	Dual-LED green / red
Supply voltage	24 V AC/DC ± 10 %
Current consumption	Typical < 60 mA, max. 100 mA
Analog outputs for w_N and T_M (type: Auto U / I)	Auto U/I: 0 … 10 V / 4 … 20 mA (signal characteristic depends on R_L) Voltage output: R_L ≥ 550 Ω (short-circuit protected) Current output: R_L ≤ 500 Ω Change-over hysteresis: 50 Ω C_L ≤ 10 nF Voltage output: RL ≥ 500 Ω Current output: RL ≤ 500 Ω Hysteresis: 50 Ω
Electrical connection	Standard: Non-detachable cable, 5 wires, length 2 m or selectable (3 … 100 m; steps of 1 m) Hygienic Design Option: Cable fix linked to sensor: 1.5 m, 5 pole M12 plug; Additional content of delivery: cable 10 m, 5 pole M12 bushing
Maximum cable length	Voltage interface: 15 m<brCurrent interface: 100 m
Mounting position	Arbitrary
Minimum immersion depth	58 mm (< 58 mm upon request)
Protection type / class	IP65 / III or PELV (EN 50178)
Probe length	300 / 500 mm
Weight	200 g max.
Material
Sensor tube	Stainless steel 1.4571
Sensor head	PBT glass-fiber-reinforced, stainless steel 1.4571
Protective coating (optional)	Polyurethan / parylene (coating not available for Hygienic Design version)
Sensor cable	Standard: PUR, halogen-free Hygienic Design Option: PP-EPDM, halogen-free

¹⁾ based on standard conditions: 20 °C and 1,013.25 hPa, related to adjustment reference; "fmr" = final measuring range

Subject to technical changes.

Order information

	Description	Article-Number
Basic sensor	SCHMIDT^® Flow Sensor SS 20.250; 2 x output signal 4 … 20 mA and 0 … 10 V; cable length 2 m	526 340-	X	Y	Z	P	A
	Options
Mechanical type	Sensor length 300 mm		1
Mechanical type	Sensor length 500 mm		2
Measuring range, adjustment accuracy and calibration	Mesuring range 0 … 1 m/s			1
	Mesuring range 0 … 10 m/s			2
	Mesuring range 0 … 20 m/s			3
	Special measuring range (1 … 20 m/s; 0.1 m/s)			9
	Standard adjustment				1
	Standard adjustment with factory calibration certificate				3
	High-precision flow adjustment, including factory calibration certificate				2
Protection type	Without protective coating					1
	With protactive coating (Polyurethan derivate, not available for Hygienic Design version)					2
	With protactive coating (Parylene, not available for Hygienic Design version)					3
Connecting cable	Cable length 2.0 m						1
	Special cable length: 3 ... 100 m; 1 m steps						2
	Hygienic design cable with fix linked to sensor 1.5 m, 5-pol M12 plug-in connector; additional content of delivery: 10 m hygienic design cable, 5-pol M12 bushing						3

Accessories

Connection technology

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

Mounting and fixing technology

Description	Article-Number
Mounting flange steel, galvanic zinc-plated	301 048
Wall-mounting flange, stainless steel, PTFE-clamping ring	520 181
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 Dec voltage supply	528 240
SCHMIDT® LED display MD 10.015, similar to 527320 but with an additional sum function and a 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