microDAQ3

microDAQ3
64 Channel Advanced PressureScanner• New and advanced use of digital sensor technology.
• Unparalleled Data Quality: up to 0.01% of full scale• High speed : 400Hz per channel• Absolute and differential measurements• Optional electrically driven valve for purge and re-zero• Power-over-Ethernet• Complete with IEEE 1588 PTPv2 time stamping• Thermally compensated from -20 to 90 Co• 24 bit ADC per channel• Output over Ethernet (100Mbit TCP / UDP) and CAN• Available with quick-disconnect top plate• Fully configurable over Ethernet with embedded
web server

Chell Instruments Ltd.
Folgate House, Folgate Road, North Walsham, Norfolk NR28 0AJ England

The Chell microDAQ3 is a leap forward in pressure scanning technology.
The use of high accuracy digital sensors combined with an advanced
processor design results in the most accurate - and most versatilepressure scanner on the market.
The microDAQ3 will output differential or absolute compensatedengineering unit pressure data over Ethernet, CAN, IENA, and EtherCAT(see microCAT3) at speeds up to 400Hz per channel.
The microDAQ3 offers the option of an electrically driven valve thatgives the scanner a purge and re-zero facility. The valve has been years
in development and features precise positional measurement andcurrent monitoring to ensure reliability.
The microDAQ3 is also the smallest digital pressure scanner on themarket - even when fitted with the electrically driven valve. The nonvalved option gives the user a further reduction in size when purge is
not required.
The microDAQ3 makes use of high accuracy transducers which arecombined with two 24-bit ADC’s per port - one for pressure and onefor temperature. This precise temperature measurement allows theMicroDAQ3 to almost entirely compensate for thermal effects over its
wide operating range.
The microDAQ3 makes use of all the technology that Chell has
developed with its MicroDAQ and nanoDaq range such as embedded
web server, IEEE 1588 PTP time stamping, power-over-ethernet, CAN,
hardware trigger and EtherCAT (see MicroCAT3).

Tel: +44 (0)1692 500555 | Fax: +44 (0)1692 500088
sales@chell.co.uk | www.chell.co.uk

microDAQ3
GeneralRanges Available

1, 2.5, 5, 7, 10,17, 35, 55, 103, 207 and 310 kPa

Number of channels

64

Maximum Acquisition Speed (measurements / channel / second)

400

Data Output
PoE version (CC=01)
DC Powered version (CC=02)
Ethernet Specification
CAN Specification (DC Powered version only)

Ethernet (TCP/IP & UDP), IENACAN and Ethernet (TCP/IP & UDP), IENA
100Mbit TCP/IP or UDP (user configurable)
2.0B

Performance
System Accuracy
Absolute Ranges

See table below
See table below

Reference pressure range (differential range ≤ 8 psid)

13 kPa to 160 kPa (1.89 psia to 23.2 psia)

Reference pressure range (differential range > 8 psid)

13 kPa to 400 kPa (1.89 psia to 58 psia)

Line pressure effect
Proof Pressure (all ranges)

Negligible
Ranges ≤ 8 psid :50 psig (64.5 psia), Ranges >8 psid:90 psig (105 psia)

Ouput Resolution

16 bit or ±range / 65536

System Resolution

24 bitMechanical
Valved version Dimensions width x depth x height in mm)

80 x 38 x 34 excluding tubulations

Non-valved version Dimensions (width x depth x height in mm)

80 x 38 x 27 excluding tubulations

Weight (Valved / non-valved)
Enclosure Sealing

205g / 157gIP54

Measurement ports

1.0 mm (0.04”) bulged tubulations

Purge ports (valved version only)

2.3 mm (0.09”) bulged tubulation

Maximum purge pressure
Purge Flow

10 bar gauge
22 SLPM at 1 bar purge, 46 SLPM at 2 bar purge and 66 SLPM at 3 bar purgePower Supply
Input supply (DC Powered version)
Power consumption (DC Powered version)
PoE Specification

8-30 VDC
1W (non-valved), 4W (valved)
IEEE 802.3at Type 1

Electrical Connector (DC Powered version)

Female 9-way micro-miniature ‘D’ type(suggested mate : Glenair MWDM2L-9PS - solder cup version)

Electrivcal Connector (PoE Version)

Male 9-way micro-miniature ‘D’ type(suggested mate : Glenair MWDM2L-9SS - solder cup version)

Environment
Operating Temperature Range
Compensated Temperature Range
Storage Temperature Range
Ambient Pressure
Vibration
Shock
Maximum relative humidity-40 to +90°C
0 to +90°C (optional -20 to +90°C)-40 to +90°C
100 mbar abs (52,000 ft) to 2.5 bar abs
Engine standard vibration test to DO160E category S, curve W with duration of
1 hr/axis. Fan blade (20 g 2 kHz)Fan blade out to DO160F section 7 (40g 11 m/s)
95% at 50°C (non-condensing)

Timing / Data Synchronisation
Time Stamping
Time Stamping Resolution
Hardware Trigger (DC powered version only)

IEEE 1588 PTPv21μs
5 V TTL pulse, maximum 400 Hz, minimum 2 Hz

microDAQ3 - SL0142-2.1

microDAQ3

microDAQ3 Accuracy - A Metrology Approach

7 kPa Microdaq3 at 400Hz and 10Hz

The performance and flexibility of the microDAQ3 calls for a different approach to specifying its
accuracy. The table below details the resolution, standard deviation and errors with 95% confidence(2 x sigma). This is comparible with data from other manufacturers.

10Hz400Hz

In addition to this, we have detailed the measurement uncertainty which takes into account thefollowing sources of error:
Uncertainty of the Chell calibration standards used in production
Thermal errors from 0 to 90°C
Drift errors over 12 months
-30
-28
-26
-24
-22
-20
-18
-16
-14-12-10-8-6-4-2
0
24
68
10
12
14
16
18
20
22
24
26
2830

•
••Error (Pa)

DifferentialOutput

StandardRange (+/-)*

Resolution (Pa)Deviation (Pa)±Pa

Error (95% Confidence)%FS

Uncertainty
%FS

0.91

1.82

0.2%

0.4%

1 kPa

4” water

0.03

2.5 kPa10” water

0.08

0.91

1.82

0.07%

0.15%

5 kPa

20” water

0.15

0.91

1.82

0.04%

0.08%

7 kPa

1 psi

0.21

1.1

2.26

0.03%

0.06%

10 kPa1.5 psi

0.31

1.25

2.5

0.03%

0.04%

17 kPa2.5 psi

0.52

1.5

3.0

0.02%

0.03%

35 kPa

5 psi

12.01

7.0

0.02%

0.03%

55 kPa

8 psi

1.7

1.71

110.02%0.03%-83 kPa-12 to3.15

3.0

20

0.02%

0.03%

to 103 kPa

15 psi
6.3

540

0.02%

0.03%

9.5

9.060

0.02%

0.03%

OutputResolution (Pa)Standard
Deviation (Pa)

1.5

1.13

20

0.02%

0.025%

2.24

1.6

30

0.02%

0.025%

2.9

3.5

40

0.02%

0.025%

6.1

660

0.02%

0.025%-83 kPa-12 to207 kPa

30 psi-83 kPa-12 to300 kPa

43.5 psi* Differential range assumes a reference of 1 bar%FS values refer to the percentage of the differential range as listed.
Data collected in accuracy mode with an average of 16.

AbsoluteRange
15 to 115 kPa

2.2 psia to 16.8 psia

Error (95% Confidence)±Pa%FS

Uncertainty%FS

Extended range (for scanners calibrated at 55 kPa)
13.0 to 160 kPa

1.885 psia to 23.2 psia

Absolute range for 15 psid scanners
15.0 to 206 kPa

2.2 psia to 29.9 psia

Absolute range for 30 and 45 psid scanners
0 to 400 kPa

0 psia to 58.01 psia

Data collected in accuracy mode with an average of 16%FS values refer to the percentage of the maximum absolute values as listed.

microDAQ3 - SL0142-2.1microDAQ3
Comparison of MicroDaq2 and MicroDaq3 15 psi, 10Hz data

microDAQ3 Data

Digital Transducers - A revolution in data quality
The digital transducers used in the microDAQ3 provide unparalleleddata quality. When the pressure and temperature output for eachtransducer are processed with our proprietary thermal compensation routine, the results set a new standard for pressure scanners
and a considerable improvement over the microDAQ2 productrange.

microDAQ2
Data with spancalibration

The histogram opposite shows a 15 psid microDAQ3 when compared to the data from a microDAQ2 which incorporate a digitally
thermally compensated scanner using conventional transducers.
The microDAQ3 produces superior data to conventional compensated scanners - even when the older scanners are used with on-linecalibration!

90
10080

60

50

40

30

200

10-1
0-2
0-30-40-5
0-6
0-70-80-90-100This performance removes the need for on-line calibration and, inmost cases, rezero.

70

microDAQ2 Data
without spancalibration

Error in Pa across all data points from -ve full scale to +ve full scale

The Purge Valve:We have been developing the new purge valve for the last fewyears. To remove the need to supply pneumatic pressures to thescanner, the new valve is electrically driven by a precision hightorque motor and gearbox. We continuously measure the positionof valve (to 5 µm) and the current consumed by the motor to ensure
reliable, repeatable performance.
The valve has been rigorously tested to 10,000 cycles and features acycle count so that any necessary maintenace can be planned.
The purge flow through the valve has been characterised over apressure range and provides a greater flow than scanners offeredelsewhere.

Connecting to the microDAQ3
The microDAQ3 draws on the long history of the microDAQ products and provides thefollowing interfaces:[1] Ethernet (TCP/IP and UDP)
[2] CAN (non PoE models only)[3] IENA[4] EtherCAT (see microCAT products)
Connecting to the microDAQ couldn’t be easier. The Ethernet comes directly out ofthe microDAQ so the customer can produce their own cables or use a Chell cable. Inaddition to the cables, we also provide a range of interfaces that simplify the connection further by breaking the cable out to standard RJ45 (Ethernet), BNC (Hardwaretrigger) and ‘D’ type (CAN connectors). These interfaces are available for 1, 2 and 8scanners and also come with a plug-in DC power supply.
For Power-over-Ethernet (PoE) scanners, the connectivity is even simpler as only acable and an off the shelf PoE enabled Ethernet switch is required.

microDAQ3 - SL0142-2.1

microDAQ3
Dimensions Valved Version(BB=01)

Dimensions - NonValved Version(BB=02)

Part Number:

64MD3 -AABBCCDD

AA = Range
01 = 1 kPa (4” water)
02 = 2.5 kPa (10” water)
03 = 5 kPa (20” water)
04 = 7 kPa (1 psi)
05 = 10 kPa (1.5 psi)
06 = 17 kPa (2.5 psi)
07 = 35 kPa (5 psi)
08 = 55 kPa (8 psi)
09 = 103 kPa (15 psi)
10 = 207 kPa (30 psi)
11 = 310 kPa (45 psi)

DD = Calibrated Temperature Range
01 = 0 to 90°C
02 = -20 to 90°C
CC = Interface / Supply
01 = PoE (BB=01 only)
02 = DC supply with CAN and hardware trigger
BB = Valve01 = With valve and 1 mm tubulations (2.3 mm for purge tubulations)
02 = Without valve and 1 mm tubulations
03 = With valve and quick disconnect top plate
04 = Without valve and quick disconnect top plate
microDAQ3 - SL0142-2.1

microDAQ3

The Quick Disconnect Option
Both the valved and non-valved versions of the microDAQ3 are available with a quick disconnect option.
Here the tubulation plate is removable and can beeasily exchanged for another meaning the scanner
can be moved between distinct sets of tubing.

Tubulation Plate

The quick disconnect options comes as a set of four
plates (intermediate, tubulation and 2 x protector
plates). Additional tubulation plates and protector
plates can be ordered individually.

Intermediate Plate Protector

Tubulation Plate Protector

Intermediate Plate

Dimensions - Valved Version withQDC Option (BB=03)

Dimensions - Non-Valved Version
with QDC Option (BB=04)

microDAQ3 - SL0142-2.1