Pierce Probe Sensors #
Pierce Probe Sensors are used in smoke house operations. They are manufactured with heavy wall tubing to provide support for production line handling and a spring strain relief to prevent chafing of the Teflon® insulated wires. The sensor can be configured to your dimensional requirements or it may be purchased off the shelf with a 0.188” O.D. stainless steel sheath, 4” in length, pointed tip and 10’ of lead wire.
HVAC RTD Sensors #
Overview: Unlike sensors which use temperature elements staggered every few inches or feet, the entire length of this copper sheathed Air Duct Averaging Sensor is an active resistor for the ultimate in precision measurement. This sensor is custom manufactured in lengths to meet construction and retrofit specifications of your HVAC application.
Features:
- Accurate and stable sensing ensures maximum energy efficiency
- Optional matched system calibration of transmitters and sensors offer increased accuracy
- RTDs, thermistors and humidity sensing for a variety of applications in critical HVAC/R environments
- Room air, outside air, duct, and fluid sensors
- RTD’s to standard platinum and nickel-iron curves
- Relative Humidity Sensors and Transmitters
Field Adjustable Sensor #
Field Adjustable Sensors are ideal for applications involving various sheath lengths that are best determined on site, rather than on an engineering drawing. The temperature sensor can be used with a variety of fittings and termination hardware and can be adjusted by almost anyone. A. cutting tool is used the cut the sheath to the desired length and a grommet is used to cover the sharp edges to protect the lead wires.
RTD Temperature Elements #
Overview: Thin film platinum temperature sensors capable of measuring up to +1000°C provide precise measurement solutions for high temp applications.
Features:
- Temperature Range: -70°C to +1000°C
- Temperature Coefficient: TCR = 3770 ppm/K
- Nominal Resistance at 0°C (ohm):200
Thin Film RTDs #
Overview: Thin film elements are mass produced by automated equiptment which deposites a layer of platinum onto a ceramic substrate and uses a layer photolithography to etch an electrical current path corresponding to the required value of ohms. The elements are smaller than traditional wire and as a result have a faster response time and fit more applications, while reducing user costs at the same time.
Features:
- Tolerance: +/- 0.12% (EN60751 Class B)
- Material: Aluminum oxide substrate with fused glass cover
- Dimensional Tolerance: 400,600 °C elements +/-0.02 (0.05mm) SMT models: Length x Width +/-0.008 (0.02mm) Thickness: +/-0.004 (0.01mm)
- TCR: 0.00385 Ω/Ω/ °C
- Repeatability: +/-0.1 ° or better
- Stability: Drift less than 0.1 °C/year in normal use
- Vibration: Withstands 20 G’s minimum at 10 to 2000 Hz
- Shock: Withstands 100 G’s minimum sine wave shock of 8 miliseconds duration
Embedment RTDs #
Overview:
Bearing sensors are miniature sensors installed in or beneath the babbitt layer of the bearing shoe. The sensors monitor the metal temperature- the most reliable indicator of bearing condition- to give early warning of oil film breakdown. Machines can then be shut down and the problem can be corrected before catastrophic bearing failure occurs.
While no larger than many bare ceramic elements, these rtds have a metal cases and insulated leads to withstand rough handling and harsh environments. They’re east to install in drilled holes for general purpose sensing. A bearing failure will not only mean a application shutdown; it could also result in secondary or peripheral damage to costly internal parts. Early detection of a bearing failure may only result in an outage lasting a few days, but an undetected failure, causing major internal damage, can force an outage for weeks or months.
Most bearing failures such as flaking and pitting, spalling, unusual wear patterns, rust and corrosion, creeping, skewing and others are usually attributed to a relatively small group of causes that are often interrelated and correctable. These causes include lubrication, mounting, operational stress and bearing selection and environmental influence.
Features:
- Embedment sensors install in bearings for over-temperature protection
- Small, Rugged RTDs withstand rough handling and harsh environments
- Certified non-sparking sensors for hazardous areas
- Bolt on designs for east installation
Specifications:
- Temperature Range: – 50 to 260 °C (-58 to 500 °F)
- Case: Tin plated copper alloy.
- Babbitt Tip: Factory applied babbitt tip, available on case style A or B, reduces the danger of overheating the sensor when installed in the babbitt layer.
- Leads: Stranded copper with PTFE insulation; stainless steel overbraid optional.
- Leadwire Sizes Available (AWG):
Sanitary RTDs #
Overview: A sanitary system accepted practices pertain to the sanitation aspects of equipment used to produce frozen desserts, egg, milk, cottage cheese, and similar food and dairy products. Included are Culinary Steam, Boiler Feed Water, Heat Exchangers, Transfer Station, Silo Tank, Atmospheric Pasteurizers, Pipeline Milking Systems and Feed Production.
Why is 3A Sanitary Temperature Measurement Important?
The following sanitary systems are dependent upon accurate temperature measurement:
- Pasteurization Systems include high temperature short time (HTST) at 105 degree’s Celsius and higher heat shorter time (HHST) at 149 degree’s Celsius. requirements.
- Boiler Feed Water Systems include temperature measurement to reduce water hardness and to prevent corrosion and scale in boilers and or to facilitate sludge removal for proper boiler care and operation.
- Santization Systems include temperature, time and the concentration of specific detergent solutions and bactericides. Cleaning and sanitizing procedures routinely include requirements at 121 degree’s Celsius.
Such factors as flavor control, homogenization, clarification, and separation of the product are also directly affected by temperature.
Averaging Sensor #
The averaging RTD sensors measure the temperature over the entire sheath length to provide an average temperature measurement
of the cross sectional area of air ducts, room gradient temperatures, and other low temperature averaging applications. The sensing element has a
resistance output that conforms to a 100 Ω platinum element with a 0.00385 ºC-1 temperature coefficient within a measurement range of (0 to 100)
ºC [32 to 212] ºF. The RTD sensors are available in copper or 316 stainless steel sheath materials and can be supplied in various lengths.
Platinum Thermometer #
Overview: Resistance thermometers, also called resistance temperature detectors or resistive thermal devices (RTDs), are temperature sensors that exploit the predictable change in electrical resistance of some materials with changing temperature. As they are almost invariably made of platinum, they are often called platinum resistance thermometers (PRTs). They are slowly replacing the use of thermocouples in many industrial applications below 600°C, due to higher accuracy and repeatability.
There are many categories: carbon resistors, thin-film, and wire-wound types are the most widely used.
- Carbon resistors are widely available and are very inexpensive. They have very reproducible results at low temperatures. They are the most reliable form at extremely low temperatures. They generally do not suffer from significanthysteresis or strain gauge effects. Carbon resistors have been used for many years because of their advantages.
- Film thermometers have a layer of platinum on a subsrate; the layer may be extremely thin, perhaps one micrometer. Advantages of this type are relatively low cost (the high cost of platinum being offset by the tiny amount required) and fast response. Such devices have improved performance although the different expansion rates of the substrate and platinum give “strain gauge” effects and stability problems.
PT100 RTD #
PT100 sensors offer excellent accuracy over a wide temperature range (from -200 to +850 C).
PT1000 RTD #
The Pt1000 has 1000 ohms resistance at 0 C. These sensors are normally fitted into some type of protective sheath or mounting to form a probe.
Flex Armor Temperature #
Overview – Flex armor resistance temperature detectors (RTDs), Thermistor, Semi-Conductor and Thermocouple temperature sensors are available in 3 configurations:
They are available in:
- Flex Armor Sensor
- Flex Armor Sensor with transition
- Flex Armor Sensor with 2 transitions
Flex armor temperature sensors are commonly used in extruder and plastic processing and bearing industries. The samples shown are 100 ohm RTD temperature sensors in a 4-wire, teflon insulated configuration. This provides an operating temperature range of -50 to 250 C. Fiberglass insulated wire is also an option.
The length of the tip, sheath, transition and lead wire are specified by the customer to suit the application. The lead wire can be supplied as bare wire, terminated with plugs, jacks, spade lugs or junction boxes. For long cable runs, stainless steel overbraid or flex armor can be added to protect the lead wires. These temperature sensors configurations can be manufactured as RTDs, Thermistors, and Thermocouples.
Features:
- Common types include: 100, 500, and 1000 ohm RTD temperature sensors.
- Thermistors temperature sensors: 2K, 3K, 4K, 5K, 10K, 30K, 50K, 100K
- Types of Thermocouples: T, J, E, K, N, R, S, B
- Specifications:
- Platinum 100 ohm, .00385 Alpha
- Temperature Range -50 °C to 400 °C
- DIN Class B +/- .12% Ohms at 0 °C
- Celsius= .3 Ohms + (0.005 ohms x (temperature)
Bayonet RTD #
Universal design allows for quick thermocouple or RTD installation into existing twist-lock adapters.
High Peformance Bayonet RTD
Universally installed, millisecond response times, and no conduction errors for in-hole measurements requiring high accuracy.
Bayonet Sensors Availability
Quick and universal installation with adjustable depths (thermocouple or RTD sensors installed).
Weld Pad Sensor #
Commonly used in Petro-Chemical industries. The sensors are welded or clamped to measure process temperature and are available in 3 basic configurations. The samples shown are 100 ohm RTD sensors in a 4 wire configuration with Teflon® lead wire covered by a stainless steel flex armor cable. The temperature range is –50 to +250°C. Fiberglass lead wire is also available to increase the temperature range to +400°C. The length of the tip, sheath, & lead wire are specified by the customer to suit the application. These configurations can be manufactured as RTD’s Thermocouples, Thermistors & Direct to Digital Semi-Conductor Sensors, based on the temperature limitations and specific process requirements.
RTD Resistor #
A resistor is a two-terminal electronic component which implements electrical resistance as a circuit element. When a voltage V is applied across the terminals of a resistor, a current I will flow through the resistor in direct porporation to that voltage. The reciprocal of the constant of proportionality is known as the resistance R, since, with a given voltage V, a larger value of R further “resists” the flow of current I as given by Ohms
Wire Wound Element #
The simplest resistance thermometer configuration uses two wires. It is only used when high accuracy is not required, as the resistance of the connecting wires is added to that of the sensor, leading to errors of measurement. This configuration allows use of 100 meters of cable. This applies equally to balanced bridge and fixed bridge system.
