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 +30°C

±0.5°C

0.001°C

·Platinum wire

·2 s time constant

NCAR Reverse Flow

-30 to +30°C

±0.5°C

0.001°C

·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 6^th ±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