SCHMIDT® Flow Sensor SS 23.400 ATEX

Thermal flow sensor for uni- or bidirectional measurement of flow rate of air and gases with simultaneous detection of the flow direction in an explosive atmosphere (Zone 2).

Thermopile head (very fast response time)
Flow velocity and switching signals
Probe length 130 … 300 mm
Measuring ranges 0 … 1 m/s to 0 … 20 m/s
Bidirectional measurement (optional)
Detection of flow direction (optional)
Sensor programming (optional)
Cleanroom sensor
Extremely compact (electronics is integrated in sensor tube)
Sensor element protected against mechanical stress
Linear analog output for measured flow velocity
Two switching outputs to signal flow direction and threshold
ATEX gases, zone 2: II 3G Ex nA IIC T4 Gc

Laminar flow monitoring in cleanrooms
Monitoring of overflow
Cooling air monitoring
Flow measurement in test benches
Mass and volume flow measurement

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 / 5 / 10 / 20 m/s (uni- or bidirectional)
Lower detection limit w_N	(±)0.05 m/s
Measuring accuracy
Standard w_N	±(3 % of measured value + [2 % of fmr; min. 0.05 m/s]) ²⁾
High precision (optional) w_N	±(1 % of measured value + [2 % of fmr; min. 0.04 m/s]) ²⁾
Response time (t₉₀) w_N	1 s (configurable: 0.01 … 10 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-in connector, nut screw	Stainless steel 1.4404
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Supply voltage	12 … 26.4 V DC
Current consumption	Typ. < 35 mA (max. 150 mA; including signal current of switching outputs)
Analog output w_N	0 … 10 V (R_L > 10 kΩ; C_L ≤ 10 nF; short-circuit protected) 4 … 20 mA (R_L < 300 Ω; C_L ≤ 100 nF)
Switching outputs	2 x open collector (at GND), current-limited and short-circuit protected, configurable -Channel 1 (OC1): Flow direction or threshold value - Channel 2 (OC2): Threshold value - External switching voltage / current: Max. 26.4 V DC / 55 mA (typ. 50 mA) - Hysteresis: 5 % of threshold value (min. ±0.05 m/s)
Electrical connection	Plug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable length	Voltage interface: 15 m; Current interface: 100 m
Mounting position	Arbitrary
Protection type	Sensor probe: IP66 Plug-in connection: IP67 (with correct attached cable)
Protection class	III / PELV (EN 50178)
ATEX declaration	Gas (zone 2): II 3G Ex nA IIC T4 Gc
Probe length	130/200/300 mm
Weight	Approx. 60 g max. (300 mm Sensor length)

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 23.400 ATEX, thermopile head, with ATEX* category 3G, zone 2)	513 970 -	X	Y	D	Z	R	4	P
	Options
Mechanical type	Sensor length 130 mm (only with 0 … 10 V output available)		1
	Sensor length 200 mm		2
	Sensor length 300 mm		3
Measuring range	Measuring range 0 … 1 m/s			1
	Measuring range 0 … 2.5 m/s			2
	Measuring range 0 … 5 m/s			3
	Measuring range 0 … 10 m/s			4
	Measuring range 0 … 20 m/s			5
Measurement direction, adjustment accuracy and calibration	Unidirectional – standard adjustment				1
	Unidirectional – standard adjustment with factory calibration certificate				6
	Bidirectional – standard adjustment				2
	Bidirectional – standard adjustment with factory calibration certificate				7
	Unidirectional – high precision adjustment incl. factory calibration certificate				3
	Bidirectional – high precision adjustment incl. factory calibration certificate				4
	Unidirectional LF - optimized for Laminar Flow application, high precision, with factory calibration certificate (only for measuring range 1 m/s)				5
Output signals	0 … 10 V					1
Output signals	4 … 20 mA (not for length 130 mm)					5
Direction representation	Bidirectional: switching output OC 1						1
	Bidirectional: halved analog signal (0 m/s = 12 mA / 5 V)						2
	Unidirectional						3
Sensor programming	Factory setting								S
Sensor programming	Customer-specific programming								K

* Use of the sensor in the ATEX zone only in conjunction with the original connecting cable 535 279

Accessories

Connection technology

Description	Article-Number
Connection cable with coupler socket, 5 m length, open cable ends, material PUR	535 279
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
Wall mounting flange, stainless steel 1.4571	520 181
Compression fitting stainless steel, G½, atmospheric pressure	532 160
Wall mounting bracket, aluminium, anodized	503 895
Mounting flange, stainless steel 1.4404	551 740
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 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