Delta-T Devices AP4, User Manual

Page: 58 / 64

Specifications
Page 58
PERFORMANCE SPECIFICATIONS (cont'd)
Parameter Reading range
Resolution
note [1]
Accuracy
note [2]
Test Conditions
Reading Range [5]
Conductance 5.0 -1200 mmol m -2 s -1 0.1 - 10
>90 %
>80 % 5- 800 mmol m -2 s -1
800 - 1200 mmol m
-2
s
-1
Conductance 0.25 - 30.0 mm s -1 0.01 - 0.1
>90 %
>80 % 0.25 - 20 mm s -1
20 - 30 mm s
-1
Resistance 0.2 - 40 s cm
-1
0.01 - 0.1
>90 %
+ 0.2 s.cm -1
0.5 - 40 s cm
-1
0.2 - 0.5 s cm -1
RH 0 - 100% 0.1 96%
Cup temp. -5 - +55 °C 0.1 ± 0.7 °C 0 - 50 °C
Cup-leaf temp. -5 to +5 °C 0.1 ± 0.2 °C 0 - 50 °C
PAR flux [3] 0 - 2500 μmol m -2 s -1 10 >85%
Pressure 600 -1200 hPa (mb), settable in steps of 5 hPa
RH cycle level 20 - 80 %RH, settable insteps of 5% [4]
Notes:
1. Resolution varies with the magnitude of the value obtained. The range shown corresponds
to the reading range. In relative terms, the resolution is better than 2%, but at least
the smallest amount shown.
2. Accuracy is the extent with which the measurement agrees with the true value
(100% is perfect), as verified by comparing plate readings with the reference value
(for a specific temperature and pressure).
The stated accuracy applies 10 to -5°C of the calibration temperature, and
< ±2.5°C temperature difference between cup and leaf.
3. Spectral and cosine responses are approximate only.
4. Cycling at extreme combinations of temperature, conductance and RH level may
not always be possible.
5. For Ambient RH 10 — 90%.