Operating Notes, General, Probe Limitations

General

Weight: 150 g (5.3 oz)

Overall Length: 53.8 inch (1.36 m)

Battery: Standard 9 V battery (NEDA #1604,6F22,006P)

Battery Life: 600+ hours, typical (Alkaline Battery), 6.5 V minimum

Output Termination: Standard 0.75-inch spaced double banana plug

Probe Material: Glass-filled valox

Probe Size: 0.6 inch maximum diameter

Tip Material: Nickle Plated Copper

Tip Size: 0.31 cm (0.12 inch diameter)

Operating Notes

The following paragraphs are intended to familiarize the operator with the 80T-150UA. The operator should read these paragraphs before attempting to operate the probe.

Probe Limitations

The 80T-150UA 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 exceeding +150 °C (+302 °F). The

remainder of the probe body should not be exposed to temperatures above +70 °C (+160 °F).

2.Do not expose the probe end (probe tip plus about 2 inches of the probe body) to temperatures below -50 °C (-58 °F). The remainder

of the probe body should not be exposed to temperatures below -40 °C (-40 °F).

3.For liquid measurements, recommended applications range from water, lubricants, and fuels to most solvents. Liquids as shallow as 1.27 cm (0.5 inch) can be measured since the temperature sensor is inch the probe tip.

XWWarning

To avoid electrical shock, do not use this instrument when voltages exceeding 60 V dc or 30 V ac rms (42.4 V peak ) are present. The probe tip is electrically connected to the output terminals.

WCaution

Long-term exposure of the probe to corrosive environments will result in pitting and deterioration of the aluminum probe tip. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Error Sources

When the probe tip is applied to a solid surface, it draws or sinks heat from the surface. Therefore, if the measured surface has a low mass (e.g., a transistor case), the indicated temperature may be lower than the actual temperature.

Similarly, a steady-state error or gradient exists between the measured surface and the sensing device in the probe tip. This is due to the flow of heat from the measurement surface to the probe body. The effect of the steady-state error increases as the differential between ambient and surface temperature increases.

To determine the actual surface temperature of a device, both the heat- sinking and steady-state errors must be considered. The correction curve given in Figure 1 approximates the effect of both error sources on TO-3, TO-5, and TO-18 transistor cases.