User Manual
18
5. TECHNICAL CHARACTERISTICS
5.1. REFERENCE CONDITIONS
Quantity of inuence Reference values
Temperature 23 ± 2°C
Relative humidity 45% to 75%
Supply voltage 3 to 4.5V
Electric eld < 1V/m
Magnetic eld < 40A/m
The intrinsic uncertainty is the error specied for the reference conditions.
θ = temperature
R = reading
5.2. ELECTRICAL CHARACTERISTICS FOR THE C.A 1821 AND C.A 1822
5.2.1. TEMPERATURE MEASUREMENT
Type of thermocouple J, K, T, N, E, R, S
Specied measurement range (accord-
ing to the type of thermocouple used)
K - 200 to + 1372°C -328 to + 2501°F
J - 210 to + 1200°C -346 to + 2192°F
T - 200 to + 400°C -328 to + 752°F
E - 150 to + 950°C -238 to + 1742°F
N - 200 to + 1300°C -328 to + 2372°F
R 0 to + 1767°C 32 to + 3212°F
S 0 to + 1767°C 32 to + 3212°F
Resolution
Display in °C: θ < 1000°C: 0,1°C and θ ≥ 1000°C: 1°C
Display in °F: θ < 1000°F: 0,1°F and θ ≥ 1000°F: 1°F
Intrinsic uncertainty (J, K, T, N, E)
θ ≤ - 100°C ± (0.2% R ± 0.6°C)
- 100°C < θ ≤ + 100°C ± (0.15% R ± 0.6°C)
+ 100°C < θ ± (0.1% R ± 0.6°C)
Intrinsic uncertainty (R, S)
θ ≤ + 100°C ± (0.15% R ± 1.0°C)
+ 100°C < θ ± (0.1% R ± 1.0°C)
To determine the total intrinsic uncertainty, add the intrinsic uncertainty of the thermocouple to that of the instrument, given in the
table above.
5.2.2. VARIATION WITHIN THE RANGE OF USE
Quantities of inuence Range of inuence Quantity inuenced Inuence
Temperature -10 to + 60 °C
θ
J : ± (0.02% R ± 0.15°C) / 10°C
K : ± (0.03% R ± 0.15°C) / 10°C
T : ± (0.03% R ± 0.15°C) / 10°C
E : ± (0.02% R ± 0.15°C) / 10°C
N : ± (0.035% R ± 0.15°C) / 10°C
R : ± (0.01% R ± 0.25°C) / 10°C
S : ± 0(0.01% R ± 0.25°C) / 10°C
The aging of the internal reference voltage causes the intrinsic uncertainty to increase. After 4,000 hours of use with R and S
thermocouples. After 8,000 hours with the others.
In the case of the C.A 1821 and the C.A 1822, connecting the instrument to a PC via a micro USB cord causes an internal tem-
perature rise in the instrument that may lead to a temperature measurement error of the order of 1.5°C.