Instrumentation Table

VARIABLE

INSTRUMENT

RANGE

ACCURACY

RESOLUTION
(as recorded)

NOTES

Static Pressure

Rosemount 1301-A-4B

0-15 psi (0-103 kPa)

0.015 psi
(
0.1kPa)

0.0002 psi
(0.002 kPa)

 

 

Rosemount 1301-A-4B

5-15 psi (35-103 kPa)

0.015 psi
(
0.1kPa)

0.0002 psi
(0.002 kPa)

 

Total Temperature

Rosemount 102AU2AP

-30 to +30C

0.5C

0.001C

Platinum wire

2 s time constant

 

NCAR Reverse Flow

-30 to +30C

0.5C

0.001C

Platinum RTD element

Several seconds time constant

Cloud Water and 
Cloud Droplets

DMT Liquid Water
Concentration

0 - 4 g/m3

20%

0.0001 g/m3

Sampling rate 4 l/km

 

Particle Measuring Systems, Inc. Forward Scattering Spectrometer Probe

Size 1 < 67 mm
Concentration

0 - 2000 droplets/cm3

1 size channel in size and 1% in concentration at ~50/cm3

1 size channel

15 discrete size channels spread over an adjustable range

Sampling rate 300 cm3/km

Accuracy of computed liquid water concentration ~50%. Depends on processing.

Precipitation Particle Sizes And Concentrations

Particle Measuring
Systems, Inc.
2D Cloud Probe

Size 25 - 800 mm

25 mm

25 mm

Computed ice and water mass concentration can vary 50% with processing technique

Sampling rate: 0.05 m3/km; DAS can accept ~250 particles/s (2500/km)

High-Volume Particle Sampler

SPEC

HVPS

Size 0.2 50 mm

0.2 mm

0.2 mm

Sampling rate: 10 m3/km

Also senses particle electric charge

 

Hail Spectrometer

Size 4.5 mm - 4.5 cm Concentration 0 - 100/m3

1 size class

1 size class

14 size classes, and images

Sampling rate 100 m3/km

Aircraft Motion

Humphrey
SA09-D0101-1 Vertically Stabilized Accelerometer

2 g's
pitch 50
to 50
roll 50
to +50

0.004 g's
0.2

0.2

0.00006 g
0.002

0.002

 

 

Rosemount 1301-D-1b
Dynamic Pressure

3 to +3 psi
(20 to +20 kPa)

0.1%

0.0001 psi
(0.0006 kPa)

 

 

Rosemount 1221-F-2A
Dynamic Pressure

2.5 to +2.5 psi
(18 to +18 kPa)

0.1%

0.0001 psi
(0.0006 kPa)

 

 

Giannini 45218YE
Manifold Pressure

0 to 50 in Hg

2%

0.008 Hg
(0.03 kPa)

Used in backup vertical velocity calculation

 

Crossbow Non-Stabilized 3-Axis Accelerometer

4 g in all 3 directions

0.2%

3.05 x 10-4 g's

 

Aircraft Location

Trimble TNL2000 GPS

(global)

30 m 

18 m

 

Electric Field

NMIMT Model E-100
DC Electric Field Meter

top/bot 650
wingtips
3200 kV
5th and 6th
340 m

 

(coarse resolution)
0.01 kV/m

 

NOTE: Many of these instruments do not behave as ideal instruments. The use of one measure of accuracy over the entire range of measurement is, in many cases, questionable. An accuracy representative of the most useful part of the range is given here. Revised 01/2001