SCHMIDT® Flow Sensor SS 20.500

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 on request
Measuring range w_N	0 … 1 / 2.5 / 5 / 10 / 20 / 35 / 50 m/s
Lower detection limit w_N	0.06 m/s
Measuring range T_M	-40 … +85 °C
Measuring accuracy
Standard w_N	±(3 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) ²⁾
High precision (optional) w_N	±(1 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) ²⁾ (only for measuring range 0 … 1 m/s)
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 probe	-40 … +85 °C
Electronics	-20 … +70 °C
Storage temperature	-40 … +85 °C
Material
Enclosure	Aluminium, anodised
Sensor tube	Stainless steel 1.4404
Sensor head	PBT (glass-fibre reinforced), stainless steel 1.4404
Protective coating (optional; sensor head only)	Polyurethane derivate (black) / parylene (transparent)
Protective sleeve (ATEX option)	Aluminium, anodised
Sensor cable (of remote sensor)	(TPE, halogenfree, black)
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Compact version: 10 bar (overpressure) Remote version: Atmospheric (700 hPa … 1,300 hPa)
Display	4 x Duo-LEDs (green/red/orange)
Supply voltage	24 V AC/DC ± 20 %
Current consumption	Typ. < 60 mA (max. 170 mA)
Analog outputs Type: Auto U / I)	w_N, T_M 0 … 10 V / 4 … 20 mA (switching of signal characteristic depends on R_L) -Voltage output (0 … 10 V): R_L ≥ 550 Ω (short-circuit protected) - Current output (4 … 20 mA): R_L ≤ 500 Ω - Change-over hysteresis: 50 Ω - C_L ≤ 10 nF
Electrical connection	Plug-in connector M12 (A-coded), male, 5-pin, screwed ATEX approval only in combination with original cable!
Maximum cable length	Voltage interface: 15 m; current interface: 100 m
Mounting position	Arbitrary
Minimum immersion depth	58 mm (< 58 mm on request)
Protection type	Sensor probe: IP67; enclosure: IP65; electrical connector: IP67 (with correctly attached cable)
Protection class	III (SELV) or PELV (EN 50178)
ATEX category	Gas (zone 2): II 3G Ex ec ic IIC T4 Gc Dust (zone 22): II 3D Ex tc ic IIIC T135°C Dc
Probe length	Compact version: 100/150/350 mm; special length: >100 … 1000 mm (step: 10 mm) Remote version: 161 mm (probe); cable length: 3 m or special length 1 … 30 m (step: 1 m)
Weight	400 g max. (without connecting cable)

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 20.500; 2 x output signal 4 … 20 mA and 0 … 10 V	521 501 -	X	Y	Z	P	A
	Options
Mechanical type	Sensor length 100 mm		1
	Sensor length 150 mm		2
	Sensor length 350 mm		3
	Special sensor length: >100 … 1,000 mm; 10 mm steps		9
	Remote sensor with 3 m cable		4
	Remote sensor with special cable length: _____ m (1 ... 30 m; 1 m steps)		5
Measuring ranges and calibration	Measuring range 0 … 1 m/s			1
	Measuring range 0 … 2.5 m/s			6
	Measuring range 0 … 5 m/s			2
	Measuring range 0 … 10 m/s			3
	Measuring range 0 … 20 m/s			4
	Measuring range 0 … 35 m/s			5
	Measuring range 0 … 50 m/s			7
	Standard adjustment				1
	Standard adjustment with factory calibration certificate				5
	Standard adjustment 4 … 20 mA				3
	Standard adjustment with factory calibration certificate 4 … 20 mA				6
	High precision adjustment including factory calibration certificate (only for Y=1 [0 … 1 m/s])				2
	High precision adjustment 4 … 20 mA including factory calibration certificate (only for Y=1 [0 … 1 m/s])				4
Protection type	Without protective coating					1
	With protective coating polyurethane derivate black (sensor head only)					2
	With protective coating parylene transparent (sensor head only)					5
	Without ATEX design (SS 20.500)						1
	ATEX-design (SS 20.500 Ex) ¹⁾						2

¹⁾ Application of sensor in ATEX area only with original connection cable 523 565 or 523 566

Accessories

Connection technology

Description	Article-Number
Connection cable with coupler socket, 5-pin, length 5 m, open cable ends	523 565
Connection cable with coupler socket, 5-pin, selectable length (2 … 100 m; 1-m-steps), cable end sleeves, halogen free	523 566
Coupler socket, 5-pin, with screw type terminals for cable of ø = 4 … 6 mm	523 562
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
Mounting flange, stainless steel	520 181
Compression fitting, stainless steel, G½, atmospheric pressure	532 160
Compression fitting, brass, G½, atmospheric pressure	517 206
Compression fitting, brass, G½, max. 10 bar, with protection against pressure losses	524 891
Compression fitting, stainless steel, G½, max. 10 bar, with protection against pressure losses	524 919
Welding sleeve, steel, G½, according to EN 10241, 5 pieces	524 916
Welding sleeve, stainless steel 1.4571, G½, according to EN 10241, 2 pieces	524 882
Assembly kit for pipe assembly suitable for MD 10.010/10.015 including pipe clamps and collar for adjustment to pipe diameter	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 but with 24 V DC voltage supply	528 240
LED display MD 10.015, similar to 527 320 but with additional sum function and second measuring input	527 330
LED display MD 10.015, similar to 527 330 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