Owner manual

- 76- Revision 4.6 3/2004
SYSTEM ACCURACY WITH
GQS-TC1 THERMOCOUPLE INTERFACE
TABLE I
System Accuracy (reading in temperature units): Includes the HHC base unit and GQS-TC1 interface module.
(Does not include inaccuracy of the thermocouple device. Consult thermocouple manufacturer or ISA MC96.1 for
thermocouple accuracy specifications. Typical inaccuracies range from ±1 to ±2.2°C.)
Max. additional error
Accuracy @ 25°C Accuracy @ 25°C due to ambient
Thermocouple Measurement Range Ambient (Not Including Ambient (Including temperature deviation
Type (°C) Internal Reference Internal Reference from 25°C. Expressed
Junction) Expressed as ±°C Junction) Expressed as ±°C as additional C error per
each C deviation from 25°C
J –210 to –151 0.7 1.1 0.02
–150 to 1200 0.3 0.4 0.01
K –240 to –201 1.5 2.2 0.05
–200 to –101 1.0 1.5 0.03
–100 to 999 0.5 0.8 0.02
T –250 to –201 1.5 2.2 0.05
–200 to –101 0.8 1.2 0.03
–100 to 400 0.5 0.8 0.02
E –250 to –201 1.2 2.0 0.04
–200 to –101 0.6 1.1 0.02
–100 to 400 0.3 0.6 0.01
R&S –50 to 299 3.4 3.6 0.10
300 to 1768 1.2 1.3 0.04
B 100 to 199 14.0 14.0 0.44
200 to 499 5.0 5.0 0.16
500 to 999 3.0 3.0 0.08
1000 to 1820 1.2 1.2 0.04
N –250 to –226 4.3 5.7 0.14
–225 to –101 2.1 2.8 0.07
–100 to 1300 1.0 1.4 0.02
Conversion Factors (to convert °C specifications to other units of measure):
To convert from °C to °F: °F = (1.8 x °C) +32
To convert from °C to °K: °K = °C +273.15
To convert from °C to °R: °R = (1.8 x °C) +427.67
TABLE II
System Accuracy (based on direct millivolt reading from thermocouple – includes MDI base unit and GQS-TC1
interface module. (Does not include inaccuracy due to the thermocouple device. Reference junction not applicable to
direct millivolt readings.)
Input Range of Accuracy @ 25°C Max. additional error due to ambient
temperature deviation from 25°C.
Expressed as additional millivolt error
per each °C deviation from 25°C
–10 to 100 millivolt ± 0.0125 millivolts .001