6109A/7109A
Operators Manual
4
Specifications
The product specifications describe the Absolute Instrumental Uncertainty of the
Product at 95 % level of confidence (coverage factor k = 2) within one year from
calibration. The product specifications include environmental temperature effects
from 13
°
C to 33
°
C.
Temperature Source Specifications
6109A 7109A
Range
(at 25
°
C ambient temperature)
35
°
C to 250
°
C
-25
°
C to 140
°
C
(-15
°
C cover off)
Accuracy: Maximum Permissible Error
0.1
°
C 0.1
°
C
Stability 0.015
°
C 0.01
°
C
Typical Uniformity
0.03
°
C up to 200
°
C
0.04
°
C above 200
°
C
0.02
°
C
Repeatability 0.04
°
C 0.04
°
C
Typical Heating Time
35
°
C to 100
°
C:
25 minutes
100
°
C to 250
°
C:
45 minutes
25
°
C to 140
°
C:
55 minutes
-25
°
C to 25
°
C:
35 minutes
Typical Cooling Time
250
°
C to 100
°
C:
35 minutes
100
°
C to 35
°
C:
55 minutes
25
°
C to -25
°
C:
75 minutes
140
°
C to 25
°
C:
45 minutes
Typical Settling Time
15 minutes
10 minutes
Notes:
•
The lower limit of the Temperature Range varies depending on the ambient temperature and whether the tank is covered.
Operating time at negative temperatures may be limited by water condensation or ice build-up, especially if the tank is
open.
•
Accuracy covers all sources of error including calibration uncertainty, stability, uniformity, and repeatability.
•
If the environment temperature is outside the Performance Environment Range but within the Operating Environment
Range, multiply the specification by 1.25.
•
Temperature Stability and Temperature Uniformity apply with the tank covered. If the Product is operated with the tank
open, multiply the specifications by 1.25.
•
Specifications are valid with fluid depth at least 130 mm and within the working volume defined as a 75 mm square
centered in the tank opening from 15 mm above the bottom of the tank to 65 mm below the surface of the fluid. The
specifications also apply with the recommended fluid in good condition. Results may vary if a different fluid is used.
•
Temperature Stability is evaluated as two times the statistical standard deviation of the fluid temperature (2 sigma) during
a 15-minute period after sufficient settling time is allowed.
•
Temperature Uniformity is defined as half the difference between the maximum and minimum temperatures within the
working volume.
•
Repeatability includes hysteresis of the control sensor. It is defined as the difference between the maximum and
minimum observed temperatures at a setpoint near the middle of the Product Temperature Range after that setpoint is
alternately reached from both extremes of the Temperature Range.
•
Cooling or heating time is measured from the time the setpoint is changed to when the fluid temperature reaches the
setpoint within the Temperature Accuracy specification. Cooling and heating times vary depending on environment
temperature, AC supply voltage, loading, and whether the tank is covered. At low ac supply voltages, heating time may be
much longer.
•
Settling time is measured from the end of the cooling or heating time to the time at which the fluid reaches its ultimate
mean temperature within a tolerance equal to the Temperature Stability specification.
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