RTD
RESISTIVE TEMPERATURE DETECTOR

International manufacture of resistive, PTC Temperature Sensors.

Product: Platinum thin film technology provides; Better than 1/10th percent accuracy. Long term stability. Linear relationship between resistance and temperature. Microprocessor compatibility. Working temperatures from minus 40 deg. C to plus 500deg. C. Board level devices, SMD, TO-92, axial, radial leaded chips, custom packaging.

Type FK-DSC Thin-Film, Platinum Resistance Temperature Detector -30º to 180º C (-22º  to +356º F)

The Type FK-DSC thin-film, platinum RTD elements are provided without leads so the user can attach leads of desired length and material for custom applications. These RTD elements provide a stable temperature sensor with high accuracy and repeatability over a moderate temperature range. They are made by the deposition of platinum onto a ceramic substrate and covered with glass. Two solder pads allow the direct connection of leads to the RTD element. All RTD elements conform to IEC-751 standards.

Heraeus Sensor
28364 Vincent Moraga, Suite E
Temecula, CA 92590
Phone: 800-454-0005Fax: 909-676-1088

Resistance Temperature Detector's by EGT

Description:

Resistive Temperature Detectors operate on the principle that the electrical resistance of a metal conductor changes as a function of temperature. RTD's provide an accurate, stable and repeatable means of absolute temperature measurement. The accuracy of an RTD may be independent of the distance between the sensor and the instrument, whether it be an indicator, recorder, controller or data logger computer. Copper hook-up wire is generally used between the sensor and instrument.

EGT RTD probes consist of a platinum resistance element that is encapsulated and circuited in a mineral insulated, metal sheath construction and terminated by means of a bare wire, quick connectors or terminal heads. This construction provides a rugged probe that is moisture, pressure, shock and vibration resistant and also is bendable up to the element area.

General Selection Parameters:

The conditions of measurement determine the type of RTD used. Temperature, atmosphere, protection, response and service life should be considered. The following descriptions serve as a guide to selection:

The Platinum Resistance Element:

Select the RTD element that will be capable of operating in your application range. The reference resistance (100Ohms @ 0C-typical) and temperature coefficient (Alpha of 0.00385-typical) must match the instrumentation in your system.

Tolerance of the RTD element:

A range of limits of error elements are available (0.1%-typical). In general, the better the tolerance, the more expensive the thermometer.

Sheath Alloy:

Select a sheath alloy that will withstand the temperature and possible corrosiveness of your application. 316 SS is standard.

Probe Diameter:

Use the probe diameter that will withstand the rigors of your application but with minimal effect on it. Because the element can be broken if the sheath is bent in the element area, it is recommended that a minimum of 0.187" diameter thermometer be used. Smaller diameters are available on request.

Process Connections:

In order to attach and/or seal the thermometer in your application, you can use a fitting or braze, weld or solder it in place.

Terminal and/or Extension Type:

For connection to instruments, various termination extensions are available. Select the circuit that is required to match your instrumentation.

Calibration Tolerances for RTD:

The designation of an RTD tolerance class is based on the percent allowable variation, in ohms, of the nominal resistance value at the reference temperature. However, for convenience, this ohmic tolerance is often expressed as an equivalent C temperature variation.

Installation:

Do not attempt to mechanically connect the assembly into the process by tightening at the terminal or connecting head. Use only the process fitting or the thermowell flats for this purpose. Terminals or connecting heads that are twisted can be damaged or cause shorts that can adversely affect the operation of the RTD. Do not bend the RTD in the element area (within six inches of the end of the sheath). Bending will break the element that is in the metal sheath and the sensor will be rendered inoperative. If thermowell or protecting tube must be welded into the process, carefully remove the RTD sensor before welding and be sure to handle carefully, keep clean and replace without forcing or stressing any components.

General Maintenance Parameters:

Regularly scheduled maintenance procedures should include inspection and calibration intervals so that life and reliability of the instrumentation is improved and the likelihood of sudden serious failure is reduced. These procedures should be set up by the responsible engineering department and performed by personnel that are familiar with the operating principles upon which the system is based. Do not lubricate.

To order, call JIMNEL enterprises now: 1-800-218-6225

Exhaust Gas Technologies
810 N. Lemon Street
Orange, CA 92667
(800)348-4678 fax:(714)997-5360
email: egt@ix.netcom.com