Precision Airflow Sensor SS 20.650
Precision airflow sensor to measure air velocity at temperatures up to +350 °C /
maintenance-free / robust enclosure / LED status indicator / analogue and digital output

This precision airflow sensor provides an accurate air velocity measurement even at higher temperatures. Due to a mechanically robust design by only using high-quality material, the precision airflow sensor provides even under extreme conditions precise and repeatable measurement results. Within the temperature range of 0 °C ... +350 °C the precision airflow sensor is able to measure air velocities between 0 .... +60 m/s depending on the model. The sensor head of the precision airflow sensor resigns of movable parts and consists of temperature-resistant ceramic, which makes it maintenance-free and allows providing reliable data even after several years. Due to the thermal measuring principle an additional measurement and calculation of pressure and temperature to determine the standard volume flow becomes dispensable at the precision airflow sensor. The internally established temperature of the precision airflow sensor can be still emitted as a separate temperature signal if demanded so. Flexible montage lengths up to 1000 mm expand the application ranges of the precision airflow sensor significantly. The precision airflow sensor therefore is especially designed for controlling burning processes, monitoring drying procedures or to monitor air compressors. In case that you should have more questions regarding the precision airflow sensor SS 20.650, please read the following technical data, use our contact form or call us: UK customers +44(0) 23 809 870 30 / US customers +1-410-387-7703. Our technicians and engineers will gladly advise you regarding the airflow sensors or all other products in the field of Control Systems, Laboratory Equipment, Measuring Instruments or Scales and Balances of PCE Instruments Ltd.

- Operating indicator by Duo-LED
- Fieldbus and profibus option
- Measuring range up to 60 m/s
- For temperatures up to +350 °C

- Low weight
- Ceramic sensor head
- Up to max. 16 bar operating pressure
- Special edition with ±1 % accuracy

Technical specifications

Measurement

standard velocity w_N in relation to standard conditions of +20 °C and 1013.25 hPa

Measuring medium 

Air and nitric, further gasses on demand

Lower limit of measuring range

0.2 m/s

Measurement accuracy 
Standard

High Precision (optional)

± (3 % fr. val. + 0.4 % fr. measuring range)¹
± (1 % fr. val. + 0.4 % fr. measuring range)¹

Repeatability w_N

±0.5 % fr. value

Response time t₉₀

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

Temperature gradient

8 K/min at w_N = 5 m/s

Pressure dependence

Independent of pressure of the medium

Measuring range temperature

0 ... +200 °C / +350 °C

Measuring accuracy temperature

±1 % fr. val. (at least 1 K)

Operation temperature

- Measuring sensor

0 ... +200 °C / +350 °C (depending on version)

- Electronics

-20 ... +70 °C

Operation pressure

standard edition: 700 ... 1300 hPa
pressure-proof high temp. edition: 0 ... 16 bar

Voltage Supply U_B

24 V DC ±20 %

Electricity input

100 mA typ. at w_N = 20 m/s and T_M = +350 °C

Initiation power

140 mA for max. 5 s

Settling time

approx. 10 sec. after initiation

Connection 

Connector (male), M12. 8-pole

Pipeline length (reliable)

- Voltage output 

- Power output

- Digital output

Analogue outputs

Type eligible, if demanded

- Function

1 flow, 1 temperature

- Type voltage

0 ... 10 V, R_L ≥ 10 kΩ

- Type electricity

4 ... 20 mA, R_L ≤ 400 Ω

Digital output w_N

pulse output
high level: ≥ U_B - 1.5 V
low level: ≤ 0.7 V
load electricity: ≤ 400 mA

Frequency digital output

0 ... 10 / 16 / 20 / 40 / 100 Hz (eligible if demanded)

Minimum pulse duration

1 / (2 x f_max)

Material

- Enclosure

aluminum AlMgSiPb, anodized

- Probe pipe

stainless steel X6 CrNiMoTi 1.4571

- Sensor Head

ceramic

- Sensor element

platinum resistance element, glass passivated

Fixation

brassed straight coupling,
montage winding G 1/2 x 12

Montage tolerance

±3 ° relative to flow direction

Montage location

eligible 

Sensor length (L)

400 / 600 / 1000 mm; relevant sensor length on demand

Weight 

550 g max. (400 mm insert length)
800 g (edition field bus)

Protection type of enclosure

IP 65

Protection type of sensor

IP 67 (pressure-resistant high temperature edition)

¹: lower reference conditions

²: limited in case of air drop flow < 2m/s and simultaneous overload pressure

Field bus DeviceNet-edition (option)

Standardization

ISO / DIS 11 989
DeviceNet Specification volume I + II
Release 2.0

Electronic connection 

8-pole screw-type terminal inside enclosure, cable input via 3 cable tunnels

Connection resistance

The connection resistance (120 Ω, 0,25 W) is switched of by the manufacturer and can be added by connecting a single-pole DIP switch

Baud rate

125 / 250 / 500 kbit/s, default values 125 kbit/s,
adjustable via DIP switch or via software

Operating types

Poll mode, change of state (COS), cyclic

Processor data

32 bit, volume flow or flow acceleration eligible

Signal thresholds

Upper and lower signal threshold for flow acceleration and volume flow eligible

Warn flag

signalization at excess of measuring range

Alarm flag

Signalization of sensor defect

Status indicator

Duo-LED indicated status of field bus communication

Profi bus DP-edition (option)

Standardization

PROFIBUS standards
EN 50 170

Electronic connection

8-pole screw-type terminal inside the enclosure
cable input via three cable tunnels

Connection resistance

The active termination resistor network (390-220-390 Ω) is turned off by the manufacturer and can be added by connecting a 2-pole DIP switch

Baud rate

9600 Bd - 12 MBd, setting automatically through PROFIBUS-Master

Address

00 ... 99, adjustable via BCD rotary control

Operating types

"Data exchange" depending on PROFIBUS DP-V0

Processor data 

32 bit; volume flow or flow velocity adjustable

Signal thresholds

Upper and lower signal threshold for flow acceleration and volume flow eligible

Warn flag

signalization at excess of measuring range

Alarm flag

Signalization of sensor defect

Status indicator

Duo-LED indicated status of PROFIBUS communication

Delivery Content

1 x precision airflow sensor (relevant edition), 1 x instruction manual

Additional Equipment

Welded sleeves
(item number 524916 (steel) or item nr. 524882 (stainless steel))

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Here you will find an overview of all the measuring instruments available at PCE Instruments.

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

Below you will find an overview of the different product groups of measuring instruments