SCHMIDT® Flow Switch SS 20.200

Specifications

Technical data
Measuring quantity	Standard flow velocity w_N, based on standard conditions ¹⁾
Measured medium	Air, nitrogen, other gases on request
Measuring range w_N	0 … 1 / 2.5 / 10 / 20 m/s
Lower detection limit w_N	0.06 m/s
Threshold w_N	5 … 95 % of measurement range (min. 0.1 m/s)
Threshold setting w_N	Potentiometer (270°)>br>Optionally pre-programmed by factory (potentiometer deactivated)
Measuring accuracy
Switching hysteresis w_N	± 5 % of threshold value; min. 0.1 m/s
Threshold pre-programmed w_N	± 3 % of measuring value + 0.1 m/s
Response time (t₉₀) w_N	3 s (jump of w_N from 0 to 5 m/s in air)
Switch-on delay	20 s
Temperature gradient w_N	< 2 K/min (at w_N = 5 m/s in air)
Operating temperature
Sensor	- 20 … + 85 °C
Electronics	- 20 … + 70 °C
Storage temperature	- 20 … + 85 °C
Material
Housing	PBT, fibre-glass reinforced
Sensor tube	Stainless steel 1.4571
Sensor head	PBT, fibre-glass reinforced, stainless steel 1.4571
Protective coating	Polyurethane derivative (optional)
Sensor cable	PVC
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	0 … 10 bar (overpressure)
Display	LED green: operating status; LED red: switching status
Supply voltage	24 V DC ± 20 %
Current consumption	Typical 40 mA (max. 70 mA, without signal current of relais output)
Switching output	Semiconductor relais; max. 30 V / 100 mA / 300 mW R_ON,max = 25 Ω
Electrical connection	Non-detachable cable, 4 wires, length 2 m
Maximum cable length	100 m max.
Mounting position	Arbitrary
Minimum immersion depth	58 mm (< 58 mm on request)
Protection type / class	Housing: IP65 (with installed rubber plug), sensor head: IP67 / III or PELV (EN 50178)
MTTF value (per 01.01.2011)	> 50 years
Probe length	100 / 200 / 350 / 500 mm
Weight	Approx. 100 g (L = 350 mm)

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 Switch SS 20.200; without protective coating	504 475 -	X	Y	S	N xx
Basic sensor	SCHMIDT^® Flow Sensor SS 20.200; with swichting output, cable length 2 m, with protective coating	505 504 -	X	Y	S	N xx
	Options
Mechanical Type	Sensor length 100 mm		1
	Sensor length 200 mm		2
	Sensor length 350 mm		3
	Sensor length 500 mm		4
Measuring range	Measuring range 0 … 1 m/s			1
	Measuring range 0 … 2.5 m/s			2
	Measuring range 0 … 10 m/s			3
	Measuring range 0 … 20 m/s			4
Signalization relais/LED	Flow velocity w_N above switching threshold: relais closes / LED on				1
	Flow velocity w_N above switching threshold: relais opens ¹⁾ / LED on				2
	Flow velocity w_N below switching threshold: relais closes / LED on				3
	Flow velocity w_N below switching threshold: relais opens ¹⁾ /LED on				4
Setting threshold	With setting potentiometer, without pre-setting					P 00
	With setting potentiometer, selectable pre-setting from 5 up to 95% of measuring range					P 05 … 95
	Selectable pre-programming (not changeable) from 5 up to 95% of measuring range					F 05 … 95

¹⁾ The configuration “open relay” in case of an alarm is called a “fail-safe” because both a power failure and a cable break can be signalized as an alarm as well.

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 made of galvanized steel	301 048
Wall mounting flange stainless steel, PTFE clamp ring	520 181
Compression fitting stainless steel G½, atmospheric pressure	532 160
Compression fitting brass G½, atmospheric pressure	517 206
Compression fitting stainless steel G½, max. 10 bar, with protection against pressure losses	524 919
Compression fitting brass G½, max. 10 bar, with protection against pressure losses	524 891
Welding sleeve steel G½, according to EN 10241, 5 pieces	524 916
Welding sleeve stainless steel G½, according to EN 10241, 2 pieces	524 882

Miscellaneous

Description	Article-Number
Clip-on bars for protection of sensor head against mechanical impacts, stainless steel	531 026
Attachable 2-wires-clip for protection of sensor head against mechanical impacts, stainless steel, H₂O₂-resistant	559 124