SCHMIDT® Flow Sensor SS 20.261

The generation of compressed air is a cost-intensive process. Therefore it is worthwhile to optimize compressed air networks.

Chamber head (fast response time)
Flow and temperature signal
Probe length 200 … 350 mm
Measuring ranges 0 … 40 m/s to 0 … 90 m/s
Pressure resistantup to 10 bar

The precise and continuous analysis of the actual consumption of a compressed air system is the basis for its optimization. To this end, the operator must know the actual volume flows of the system, the distribution of compressed air in the network and ultimately also the volume flows during idle times - the leakage quantity. This data can be used to determine exactly where and which optimisation measures must be carried out.

The solution is the use of volume flow sensors.

All necessary data will be collected, like leakage rates, consumption and distribution to the various points of use (cost allocation). Thus the maintenance intervals can be also flexibly adapted to the actual system states.

Packaging machines
Injection molding machines
Textile machines
Pneumatic conveying systems
Painting
Installation of air tools
Insulating materials

SCHMIDT Technology – Simply a question of better measurement

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 upon request
Measuring range w_N	0 … 40 / 60 / 90 m/s
Lower detection limit w_N	0.2 m/s
Measuring range T_M	-20 … + 85 °C
Measuring accuracy
Standard w_N	±(5 % of measured value + 0.4 % of fmr) ²⁾
High precision (optional) w_N	±(3 % of measured value + 0.4 % of fmr) ²⁾
Response time (t₉₀) w_N	3 s (jump from 0 to 5 m/s)
Temperature gradient w_N	≤ 8 K/min (at w_N = 5 m/s in air)
T_M (w_N > 2 m/s)	±1 K (0 … 40 °C); ±2 K (in remaining measuring range)

Operating temperature
Sensor probe	-20 … +85 °C
Electronics	0 … +70 °C
Material
Enclosure	PBT (glass-fibre reinforced)
Sensor tube	Stainless steel 1.4571
Sensor head	Platinum element (glass passivated); PPO/PA
Compression fitting	Brass (G½) / stainless steel 1.4305 (R½) (order options)
Sensor cable	PVC
General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	10 bar (overpressure)
Display	LED green: Operating state LED red (flashing): Sensor defective
Supply voltage	24 V DC ± 10 %
Current consumption	Typ. < 40 mA, max. 60 mA
Analog outputs (w_N and T_M)	4 … 20 mA (R_L ≤ 300 Ω, C_L ≤ 10 nF), short circuit protected
Electrical connection	Non-detachable cable , 4 x 0,14 mm², length 5 m, with ferrules
Maximum cable length	100 m
Mounting position	Arbitrary (except in case of a downward flow and < 2 m/s at the same time)
Mounting tolerance	±3° relative to flow direction (unidirectional)
Protection type	Sensor probe: IP66; enclosure: IP54
Protection class	III (SELV) or PELV (EN 50178)
Probe length L	200/350 mm
Weight	250 g (max.; L = 350 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^® Flow Sensor SS 20.261; 2 x output signal 4 … 20 mA; Overpressure up to 10 bar and compression fitting made of brass; cable length 2m	526 335-	X	Y	Z
	Options
Sensor length	Sensor length 200 mm, DGV: brass G½		1
	Sensor length 350 mm, DGV: brass G½		2
	Sensor length 200 mm, DGV: stainless steel PT R½		3
	Sensor length 350 mm, DGV: stainless steel PT R½		4
Measuring range, adjustment accuracy and calibration	Measuring range 0 … 40 m/s			1
	Measuring range 0 … 60 m/s			2
	Measuring range 0 … 90 m/s			3
	Standard adjustment				1
	Standard adjustment with factory calibration certificate				3
	High precision adjustment with factory calibration certificate				2

Accessories

Connection technology

Description	Article-Number
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
Welding sleeve steel, G½, according to EN 10241, 5 pieces	524 916
Welding sleeve stainless steel, G½, EN 10241, 2 pieces	524 882
Probe ball value 1" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain	530 940
Probe ball value 1 ¼" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain	530 941
Probe ball value 1 ½" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain	530 942
Probe ball value 2" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain	530 943
Straight-run probe ball valve ¾" inside thread, with threaded adapter for ½" full-length screw connection	532 355
Welded socket, steel, outside thread ¾", 5 pieces	531 200
Welded socket, stainless steel, outside thread ¾", 2 pieces	531 201
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
SCHMIDT® 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
SCHMIDT® LED display MD 10.010, similar to 527 320 but with 24 V DC voltage supply	528 240
SCHMIDT® LED display MD 10.015, similar to 527 320 but with an additional sum function and a second measuring input	527 330
SCHMIDT® LED display MD 10.015, similar to 527 330 but with 24 V DC voltage supply	528 250