Performance This section describes general performance of the 4100 series probes. Sensors are 100 ohm wirewound platinum. Except where otherwise noted, the information is in the form of estimated, rather than guaranteed, performance. Service Temperatures The temperature limits shown are generally determined by the internal construction and by lead materials. The transition area is the rearmost one inch of specified sheath length. | | Sensor/Sheath | Transition/Cable | | | | | 4150 standard
K option
VI option
4116A, 4126A
4119, 4159
H option
HS option
4120, 4160 | to 650°C
-200 to 400°C
to 650°C
to 650°C
-40 to 500°C
to 650°C
to 650°C
-40 to 100°C | to 250°C
-200 to 200°C
to 250°C
to 250°C
-40 to 100°C
to 360°C
to 250°C
-40 to 100°C |
We do not show a lower temperature limit for most probe styles. However, we suggest that you consider the K option or one of the underwater probes if the probe is likely to be frequently operated at temperatures near, or below, the average dewpoint temperature at the rear of the probe. Refer to the technical notes for more information. The platinum film sensors which we offer are rated for operation to 500°C. However, for best long-term stability we recommend that probes which contain these sensors be limited to 400°C. Probes which contain thermocouple sensors can generally be operated to the limits defined by the particular thermocouple calibration, although lead wire temperature limits, calibration drift, and oxidation of the probe sheaths should be considered. Probes which contain thermistor sensors are temperature-limited by the range of the particular thermistor used. Insulation Resistance Measured from any active lead to the probe sheath at less than 95% relative humidity. Any style
K option-tested | >1 gigohm at 100 VDC at 25°C.
>100 megohms at 100 VDC at 500°C
>1 gigohm at 500 VDC at 25°C |
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Stem Effect This is the approximate measurement error caused by energy transfer along the probe's internal leads and its sheath. It is stated as the error in °C resulting from a 1°C difference in temperature between the measurement media- water flowing at 3 ft/second minimum- and still air at the surface of the media. Immersion
1/8"
3/16", 1/4" | 1 inch
.005
.01 | 2 inches
.001
.002 | 3 inches
.0005
.0005 | 4 inches
<.0001
<.0001 |
Thermal Response This is the approximate time required for a sensor to "indicate" 99% of an instantaneous change in the temperature of the measurement media- water flowing at 3 ft/second minimum- with the probe immersed to at least 4 inches depth. 1/8" Diameter
1/4" Diameter- dual sensor
3/16" Diameter
1/4" Diameter- QR option
1/4" Diameter- single sensor
1/4" Diameter- VI option | 60-80 seconds
140-180 seconds
80-120 seconds
60-80 seconds
120-150 seconds
140-180 seconds |
External Pressure These are calculated maximum pressures, based on approximately 25% of theoretical collapse pressures for 316 stainless steel sheaths of various wall thicknesses, without fittings, at 25°C. Reference ASME B31.3. Performance will be affected by sheath surface quality, operating temperatures, and probe mounting methods. 1/8" Diameter
1/4" Diameter- dual sensor
3/16" Diameter
1/4" Diameter- VI option
1/4" Diameter- single sensor
1/4" Diameter- QR option | 300 PSI
800 PSI
4600 PSI
2300 PSI
6900 PSI
estimated 800 PSI |
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