SCHMIDT® Duplex-Laminar-Flow Sensor SS 20.415 Twin

Double 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 independently working high-nd flow sensors in one unit
Easy installation at one measuring point
No mutual influencing of the measurement
Confined space becomes a minor matter
‚Plug and Play’ and quick assembly
Precise measurement of low flow velocity [w_N]
Straight and angled design for wall ceiling mounting
Thermopile head (very fast response time)
Probe length straight version: 300 mm
Probe length angled version: 150 / 270 x 300 mm
Measuring ranges 0 … 1 m/s to 0 … 2.5 m/s
Cleanroom sensor
Extremely compact, because electronics are integrated into the sensor tube
Sensor element in the chamber head and protected against mechanical stress
Linear analog output for measured value output
Special version for the laminar-flow monitoring in cleanrooms with quick-mounting system for simple installation in cleanroom ceiling systems and 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, nitrogen, additional gases on request
Measuring range flow w_N	0 … 1 / 2.5 m/s
Max. display range flow w_N	+ 10 % above measuring range
Lower detection limit flow w_N	0.05 m/s
Measuring accuracy
Standard w_N	± (3 % of measured value + 0.05 m/s) ¹⁾
High precision (optional) w_N	± (1 % of measured value + 0.04 m/s) ¹⁾
Response time (t₉₀) w_N	1 s (configurable: 0.01 ... 10 s)
Temperature gradient w_N	< 2 K/min at 5 m/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	Stainless steel 1.4404
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. 35 mA / max. 160 mA (including all signal output currents)
Analog output w_N	2 x 0 … 10 V (R_L > 10 kΩ; C_L ≤ 10 nF; short-circuit protected) 2 x 4 … 20 mA (R_L < 300 Ω; C_L ≤ 100 nF, (w_N1 und w_N2)
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: 15 m Current interface: 100 m
Mounting position	In vertical flow direction
Protection type / class	IP65 / III or PELV (EN 50178)
Sensor length	Angled: 150 or 270 mm (vertical) x 300 mm (horizontal) Straight: 300 mm
Weight	Approx. 250 g (angled design with 270 x 300 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^® Duplex-Laminar-Flow Sensor SS 20.415 Twin with thermopile head; 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 x 300 mm (angled)			1
	Sensor length 270 x 300 mm (angled)			2
	Sensor length 300 mm (straight)			3
Mechanical fixing	Threaded bush M25 with counternut (type 1)				1
	Threaded bush M25 with thread adapter M25 x 1.5 to PG21 (type 2)				2
	Threaded bush M25 with shank nut (type 3)				3
	Welding bush (type 4)				4
	Flange bush (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, 5 m length, open cable ends, material PUR	535 279
Connection cable with coupler socket, length ________ m, open cable ends (length 2 … 100 m; 1 m steps)	505 911 - 4
Connection cable, 7-pin with angled socket, 10 m length, open cable ends, material PUR	535 281
Power supply 24 V/1 A DC (output), 115/230 V AC voltage supply	535 282

Mounting and fixing technology

Description	Article-Number
Assemply kit for tube connection for MD 10.010 / 10.015 with hose clamps and band to adapt it so the tube’s 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