5128A
Operators Manual
6
Note
The displayed dew point reading (DP) is calculated from the Product’s actual
temperature and %RH readings. It is calculated as a dew point (water vapor over
water) over the entire range, regardless if dew point is equal to or lower than 0
°
C,
and at a nominal pressure of 101.325 kPa (1 atmosphere).
Humidity and Temperature Chamber Technical Specifications
The Product specifications describe the Absolute Instrumental Uncertainty of the Product. The Product specifications
include stability, ambient temperature, and humidity (within specified limits), linearity, line regulation, the reference
standard measurement uncertainty and long term stability of one year. The product specifications are provided at a 99 %,
k=2.58, normally distributed level of confidence.
Chamber Specifications
One Year, Ambient Temperature Range 23
°
C
±
3
°
C
[1]
Chamber Temperature
Range
Chamber Humidity Range
Humidity Specification
Temperature Specification
18
°
C to 23
°
C
7 % to 80 % RH
>80 % to 95 % RH
±
1.0 % RH
±
1.25 % RH
±
0.2
°
C
±
0.2
°
C
>23
°
C to 28 °C
7 % to 80 % RH
>80 % to H
max
[2]
% RH
±
1.0 % RH
±
1.25 % RH
±
0.2
°
C
±
0.2
°
C
[1]
For ambient temperature range of 23
°
C
±
5
°
C, multiply the specifications by 1.5.
[2] H
max
is the maximum humidity value at which the specification applies. See Chamber Operational Range below for H
max
.
Note
Specifications apply to the Working Volume shown in the Working Volume Template
found at the end of the Operators Manual, and are referenced to the “Actual”
reading on the Product display.
Chamber Uniformity and Stability
Ambient Temperature Range: 23
°
C
±
3
°
C
[1]
Chamber
Temperature
Chamber Humidity Range
Chamber
Temperature
Uniformity
[2]
Chamber
Humidity
Uniformity
[2]
Chamber
Humidity
Stability
[3]
Chamber
Temperature
Stability
[3]
Min % RH
Max % RH
18
°
C to 28
°
C
7 % RH
See
Chamber
Operational
Range
Below
±
0.12
°
C
±
0.3 % RH
±
0.1 % RH
±
0.05
°
C
The following specifications are typical for chamber conditions shown
[4]
5
°
C to <18
°
C
15 % RH
See
Chamber
Operational
Range
Below
±
0.5
°
C
±
1.5 % RH
±
0.5 % RH
±
0.5
°
C
>28
°
C to 30
°
C
7 % RH
±
0.2
°
C
±
0.6 % RH
±
0.3 % RH
±
0.2
°
C
>30
°
C to 35
°
C
7 % RH
±
0.3
°
C
±
0.9 % RH
±
0.4 % RH
±
0.3
°
C
>35
°
C to 40
°
C
7 % RH
±
0.5
°
C
±
1.5 % RH
±
0.5 % RH
±
0.5
°
C
>40
°
C to 50
°
C
7 % RH
±
0.5
°
C
±
1.5 % RH
±
0.5 % RH
±
0.5
°
C
[1]
For ambient temperature range of 23
°
C
±
5
°
C, multiply the specifications by 1.5.
[2]
Defined as the uniformity of the Working Volume.
[3]
Defined as 1-sigma standard deviation of measurement readings over a 5-minute span.
[4]
Chamber humidity uniformity is listed for mid-level humidity settings. Lower humidity settings will give better uniformity
while higher humidity settings will give worse uniformity.