© Isothermal Technology
Page 98 of 102
923 milliK manual - issue: 1.10
Keep-Warm Current
SPRTs/PRTs:
1mA and 1.428mA
Cable Length
30m (<10
Ω
per core and <10nF between cores)
Input Connectors
SPRTs/PRTs:
Lemo EPG.1B.306.HLN 6-pin gold plated contacts
Thermocouples:
Miniature Thermocouple socket (ASTM E 1684-05)
4-20mA:
4mm sockets
Interfaces
10/100MBit Ethernet (RJ46 socket)
USB (2.0) host
2 x RS262 (9-pin D-type plug, 9600 Baud)
Display
89mm / 3.5” QVGA (320 x 240) colour TFT LCD with long-life LED backlight
Operating Conditions
Operating:
0-40°C / 32-113°F, 0-95% humidity
Full Specification:
15-30°C / 50-85 °F, 10-90% humidity
Power
90-264V (RMS), 47-63Hz (universal), 6W maximum
Size
255mm x 255mm x 114mm / 10” x 10” x 4.5” (W x D x H)
Weight
2.25kg / 5lb
Note: The temperature accuracy figures for thermocouples depend on the slope of the V-T curve for the selected
thermocouple type and on the measured temperature (since the slope varies with temperature). Additionally, if
reference junction compensation (internal or external) is used rather than an ice-point reference, the total
accuracy also depends on the slope of the V-T curve at the reference junction temperature (typically around
20°C). The temperature accuracy figures for thermocouples presented in the table above are at representative
temperatures for the thermocouple type.
The curves below show how the temperature accuracy varies with measured temperature (both initial and 1-
year) for all the thermocouple types supported by the milliK when it is used with either an ice-point reference
(for highest accuracy) or internal reference junction compensation (the least accurate, but most convenient
method).
To determine the temperature accuracy for external reference junction compensation (see section 26), calculate
the accuracy to which you are measuring the reference junction temperature (depends on the accuracy of the
PRT used, the accuracy of the milliK measuring the PRT and the temperature gradient between the reference
junction and the temperature sensor) and then interpolate between the “ice point reference” and “internal RJC”
curves using the fact that the RJC sensor accuracy is ±0.1°C (initially) / ±0.2°C (1-year).
x-axis = measured temperature in °C, y-axis = temperature accuracy on °C
