SCHMIDT® Duplex-Laminar-Flow Sensor SS 20.415 Twin

Doubled validation of laminar flow

(registered design)

Thermal duplex flow sensor for redundant validation of laminar flow applications at one measuring point.

Redundant validation of laminar flow applications
Two independent, full-fledged flow sensors in one unit
Easy installation at one measuring point
No mutual influence of measurements
Confined space becomes a minor matter
‚Plug and Play’ combined with quick assembly
Precise measurement of low flow velocity [w_N]
Straight and angled design for wall and ceiling mounting
Probe length straight version: 300 mm
Probe length angled version: 150 / 270 mm x 300 mm
Measuring ranges 0 … 1 m/s to 0 … 2.5 m/s
Cleanroom sensor
Extremely compact (electronics are integrated in tubes)
Sensor element protected against mechanical stress
Linear analog output for measured value output
Serial number of sensor is visible when installed
Special version for laminar-flow monitoring in cleanrooms with quick-mounting system for simple installation beneath a ceiling systems or at walls

Laminar flow monitoring in cleanrooms
Flow monitoring in pharmaceutical production, semiconductor manufacturing, food production, LCD manufacturing and optical industry
Integration into insulators, FFUs and flow boxes

SCHMIDT Technology – Simply a question of better measurement

Specifications

Technical data
Measuring quantity	Standard flow velocity w_N based on standard conditions ¹⁾
Measured medium	Clean air or nitrogen, additional gases on request
Measuring range w_N	0 … 1 / 2.5 m/s
Max. display range w_N	+10 % above measuring range
Lower detection limit w_N	0.05 m/s
Measuring accuracy
Standard w_N	±(3 % of measured value + 0.05 m/s) ²⁾
High precision (optional) w_N	±(1 % of measured value + 0.04 m/s) ²⁾
Response time (t₉₀) w_N	5 s
Operating temperature
Sensor	0 … +60 °C
Storage temperature	-20 … +85 °C
Material
Sensor head	Stainless steel 1.4404
Sensor tube	Stainless steel 1.4404
Plug connector, nut srew	Stainless steel 1.4404
Light ring	PC
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Supply voltage	24 V DC ± 10 %
Current consumption	Typ. 32 mA / max. 45 mA (including all signal output currents)
Analog outputs w_N,A & w_N,B	0 … 10 V (R_L ≥ 10 kΩ; short-circuit protected) 4 … 20 mA (R_L ≤ 300 Ω>br> C_L ≤ 10 nF
Error signal	Only with current interface: 2 mA (according to NAMUR NE43)
Electrical connection	Plug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable length	Voltage interface: 10 m Current interface: 100 m
Mounting position	Straight: ±3° relative to flow direction Angled: Vertical downdraft flow (per design)
Protection type	Sensor: IP65; electrical connector: IP67 (with correctly attached cable)
Protection class	III (SELV) or PELV (EN 50178)
Sensor length	Angled: 150/270 mm (vertical) x 300 mm (horizontal) Straight: 300 mm
Weight	Approx. 250 g (angled design with 270 mm x 300 mm)

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^® Duplex-Laminar-Flow Sensor SS 20.415 Twin with thermopile heads; Basic version: w_N1 and w_N2	566 950 -	A	B	C	D	E	F	G
Options
Type	Standard		1
Mechanical type	Sensor length 150 mm x 300 mm (angled)			1
	Sensor length 270 mm x 300 mm (angled)			2
	Sensor length 300 mm (straight)			3
Mechanical fixing	Threaded bushing M25 with counternut (type 1)				1
	Threaded bushing M25 with thread adapter M25 x 1.5 to PG21 (type 2)				2
	Threaded bushing M25 with shank nut (type 3)				3
	Welding bushing (type 4)				4
	Flange bushing (type 5)				5
	Without fixation material				6
Measuring range	0 … 1 m/s					1
Measuring range	0 … 2.5 m/s					2
Output signals	0 … 10 V						1
Output signals	4 … 20 mA						2
Adjustment accuracy and calibration	Standard adjustment without certificate							1
	Standard adjustment with certificate							2
	High precision adjustment with factory calibration certificate							3
Sensor programming	Factory setting								1

Accessoroes

Connection technology

Description	Article-Number
Coupler socket, 7-pin, with soldering sleeves for cable-Ø 0.14 mm²	535 278
Connection cable with coupler socket, 7-pin, 5 m length, open cable ends, material PUR	535 279
Connection cable with coupler socket, 7-pin, length selectable (2 … 100 m; 1 m steps), open cable ends	505 911 - 4
Connection cable with angled socket, 7-pin, 10 m length, open cable ends, material PUR	535 281
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
Assembly kit for pipe assembly suitable for MD 10.010/10.015, including pipe clamps and collar for adjustment for 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 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

Miscellaneous