Over pressure air-flow probe SS 20.261
Over pressure air-flow probe to measure standard air-flow speed/ very accurate measurement/ large measuring range/ with chamber head sensor

Due to this device you have an over pressure air-flow sensor for direct determination of standard air-flow speed in air, azote and other inflammable gasses. The over pressure air-flow probe is required in areas of industries at any case that air is transported by means of pipes. The application at constructions with over pressure proves to be simple since the over pressure air-flow probe works according to the principle of a heat wire anemometer, so that there is no need of measuring or processing any indicator like temperature or pressure. At a pressure of up to 8 bar the over pressure air-flow probe can determine independently the air-flow speed. Another advantage of the over pressure air-flow sensor is that a montage of the over pressure probe is simple due to its compact design and a straight fitting included in the delivery. The over pressure air-flow probe includes a speed range between 0.2 m/s and 90 m/s and performs measurements even at -20 to +85 °C due to a sensor pipe made of stainless steel. Furthermore the over pressure air-flow probe has no flexible constructional parts and an installation tolerance for deviation of ±3° from flow direction. For operation monitoring a small LED display at the over pressure air-flow probe prove to be helpful so that if necessary a worker can perform a quick default analysis and repair. For further information about the over pressure air-flow probe SS 20.261, please read the following technical data or call our Hotline: +44 (0)2380 987030. You can also reach us through our contact form. Our engineers and technicians will gladly advise you regarding the over pressure air-flow probe SS 20.261 or all other products in the terms of regulation and control, scales and balances of PCE Instruments.

- Measuring range up to 90 m/s 
- Maintenance-free without flexible parts
- Integrated temperature measurement
- High precision balancing

- Compact design
- Simple montage
- LED status display
- Over pressure up to 8 bar

Technical data about over pressure air-flow sensor SS 20.261

Indicator

Proper speed w_N based on standard conditions with TN = 20 °C and ρ_N = 1013.25 hPa

Test medium 

Air or azote, further gasses on order (no flammable gasses allowed)

Measuring range w_N

0 ... 40 / 60 / 90 m/s

Lower threshold

0.2 m/s

Measuring range temperature TM  

-20…+70 °C

Measuring accuracy 

Standard 

± 5 % from average + 0.4 % from measuring range

High precision (option)  

± (3 % from avrg. + [0.4 % from measuring range; min. 0.02 m/s])

Reproducibility w_N

± 1.5 % from measuring value

Response time t90 w_N

3 sec. (jump from 0 to 5 m/s air)

Temperature gradient w_N

< 2 K/min at 5 m/s

Pressure dependency

Independent from pressure of medium

Measuring range temperature range

-20…+85 °C

Measuring accuracy temperature

± 1 K at wN > 2 m/s

Operation temperature 

Measuring probe 

-20 °C...+85 °C

Electronic

0…70 °C

Material  

Enclosure

PBT, fibre-glass reinforced

Sensor tube

Stainless steel 1.4571

Sensor element

Ceramic, glass passivated

Through bolt

brass

Connection cable

PVC

Fixation

Through bolt made of brass, G1/2

General data 

Operation pressure

0…8 bar

Medium, Environment

Non-condensing (up to 95% RH)

Output signals

2 x 4 ... 20 mA, R_L ≤ 300 Ω, C_L ≤ 10 nF

Permitted conductor length

100 m

Display

LED green: Operation state
LED red: sensor default

Voltage supply

24 V DC ± 10 %, 60 mA

Settling time

Approx. 10 sec. after switch-on

Connection

Plumbed cable, 4 pole, length 2 m, with wire end

Sensor length

200/350 mm (depending on model)

Installation tolerance

± 3° from flow direction

Installation position

Eligible (except downwards air-flow and simultaneously w_N < 2 m/s)

Protection type

IP 65

Dimensions of over pressure air-flow probe SS 20.261

Delivery content over pressure air-flow probe SS 20.261

1 x over pressure air-flow sensor (depending on model), 1 x straight fitting made of brass, 1 x instruction manual

Purchasable equipment for universal air flow sensor 

Welded sleeve (art. nr. 524916 (steel)) 

Contact:
PCE Instruments UK Limited
Unit 11 Southpoint Business Park
Ensign Way, Southampton
United Kingdom, SO31 4RF
Phone: +44(0) 23 809 870 30
Fax: +44(0) 23 809 870 39

Contact:
PCE Americas Inc.
1201 Jupiter Park Drive, Suite 8
Jupiter 33458 FL
USA
Phone: +1-410-387-7703
Fax: +1-410-387-7714

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