PN 778134 February 1986 Rev. 8, 7/00
1985, 1995, 1996, 2000 Fluke Corporation. All rights reserved. Printed in USA All product names are trademarks of their respective companies.
Introduction
The Model 80T-150U Universal Temperature Probe is a self-
contained temperature-to voltage converter. The probe is designed
to provide a direct temperature reading when it is connected to any
high impedance DMM that is capable of 1 mV resolution and at
least a 300-count full scale readout capability. Output is l mV per
degree (Celsius or Fahrenheit). Two switch-selected temperature
output scalings are provided: -50 to +150
°
C or -58 to +302
°
F. The
probe will stand off 60V dc or 30V ac rms (42.4V peak).
The unit is housed in two separate but attached assemblies: a
temperature probe and a temperature-to-voltage converter. The
probe contains the temperature-sensing element and is electrically
connected to the temperature-to-voltage converter through a 46-
inch shielded cable. A three-position switch on the converter acts
as a power switch and is used for selecting Celsius or Fahrenheit
scaling for the output. Two banana plugs with standard 0.75-inch
spacing are provided for connecting the 80T-150U to the DMM.
Operating power for the 80T-150U is derived from a standard 9V
battery. Typically, an alkaline battery provides more than 1600
hours of continuous operation before replacement is necessary. An
OFF switch is provided on the temperature-to-voltage converter to
allow battery conservation when the unit is not in use. In addition,
the OFF position of the power switch allows the battery condition to
be determined via the external DMM.
Temperature is measured by exposing the probe tip directly to the
material to be measured (non-corrosive liquid, gas, or solid). A
direct temperature reading is displayed on the DMM.
Specifications
The 80T-150U will achieve rated accuracy when it is used with any
0.25% DMM that has an input impedance of
≥
1 M
Ω
.
Electrical
Measurement Range: (See Probe Limitations)
-50 to +150 degrees Celsius
-58 to +302 degrees Fahrenheit
Accuracy: (Applies for one year after purchase or calibration)
AMBIENT
°
C
ACCURACY
+15 to +35
°
C
±
1
°
C from 0 to +100
°
C,
decreasing linearly to
±
3
°
C at -50
and +150
°
C
0 to 15
°
C and
±
2
°
C from 0 to +100
°
C,
+35 to +50
°
C
decreasing linearly to
±
4
°
C at
-50 and +150
°
C
AMBIENT
°
F
ACCURACY
+59 to +95
°
F
±
1.8
°
F from +32 to +212
°
F,
decreasing linearly to
±
5.4
°
F at
-58 and 302
°
F
+32 to +59
°
F and
±
3.6
°
F from +32 to +212
°
F,
+95 to +122
°
F
decreasing linearly to
±
7.2
°
F
at -58 and 302
°
F
Sensitivity (80T-150U output): 1 mV dc /
°
C or
°
F
Voltage Standoff: 60V dc or 30V ac rms (42.4V peak)
Settling Time: 5.5 seconds to settle within 2
°
for a 50
°
change
RF Field: Exposure to an RF field interferes significantly with this
module’s capacity to accurately measure temperature. The
interference is temporary and the module suffers no harm when
exposed to an RF field of 3 V/m. Accurate temperature
measurement capability is completely restored when the module is
removed from the RF field.
Common sources of RF fields are handheld two-way radios and
cellular telephones. If such a source is suspected of interfering with
this module, either turn off the transmitter or increase the
separation between the transmitter and the module.
Environmental
Ambient Operating Range for Temperature Module: 0 to +50
°
C
(+32 to +122
°
F)
Maximum Temperature Probe Body and Cable: +70
°
C (160
°
F)
See Probe Limitations
Minimum Temperature Probe Body and Cable:
Minimum Operating Temperature for Cable: -12
°
C (10
°
F)
Minimum Operating Temperature for Probe Body: -40
°
C
(-40
°
F) See Probe Limitations
Storage Temperature for Unit: -40 to +70
°
C (-40 to +160
°
F)
Humidity: 0% to 90% (0
°
C to 35
°
C)
0% to 70% (35
°
C to 50
°
C) (noncondensing)
Altitude:
Operating:
≤
10,000 feet
Storage:
≤
50,000 feet
Application Force: 15 pounds maximum (probe tip to measured
surface)
General
Weight: 5.7 ounces, 161.5 grams
Overall Length: 53.8 inches, 1.36 meters
Battery: Standard 9V battery (NEDA #1604,6F22,006P)
Battery Life: 1600+ hours, typical (Alkaline Battery), 6.5V
minimum
Output Termination: Standard 0.75-inch spaced double banana
plug
Probe Material: Glass-filled valox
Probe Size: 0.6" maximum diameter
Tip Material: Aluminum
Tip Size: 0/07" to 0.08" diameter, 30% convexed
Operating Notes
The following paragraphs are intended to familiarize the operator
with the 80T-150U. The operator should read these paragraphs
before attempting to operate the probe.
Probe Limitations
The 80T-150U probe is constructed of a highly durable plastic and
is suitable for measuring the temperature of liquids, gases, and
solid surfaces up to 150
°
C. When measuring temperature, observe
the following precautions to prevent damage to the probe:
1.
Do not expose the probe end (probe tip plus about 2 inches of
the probe body) to temperatures exc150
°
C (302
°
F).
The remainder of the probe body should not be exposed to
temperatures above +70
°
C (160
°
F).
®
80T-150U
Universal Temperature Probe
Instruction Sheet
