Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for RayTek Thermalert ET Series
Summary of Contents for RayTek Thermalert ET Series
- Page 1 Thermalert ® ™ Series Operator’s Manual Rev. J 3/96 55203-1...
-
Page 2: Table Of Contents
Sighting Viewer Tool..................2-7 Electrical Installation ..................2-8 2.3.1 Thermocouple Output Models...............2-9 2.3.2 Current Output Models.................2-10 OPERATION......................3-1 Theory of Operation ...................3-1 Controls ........................3-2 3.2.1 Temperature Range..................3-3 3.2.2 Emissivity Setting.....................3-4 3.2.3 Peak Hold......................3-4 3.2.4 Averaging Filter....................3-4 Thermalert ET Series Operator’s Manual Table of Contents... - Page 3 Troubleshooting Minor Problems..............4-1 Fail-safe Operation....................4-1 Cleaning the Lens....................4-2 Customer Service....................4-2 APPENDIX A: OBJECT EMISSIVITY................A-1 How to Determine Object Emissivity................A-1 Typical Emissivity Values ....................A-1 APPENDIX B: CE CONFORMITY FOR THE EUROPEAN COMMUNITY..B-1 GLOSSARY OF TERMS Table of Contents Thermalert ET Series Operator’s Manual...
- Page 4 In the event of failure of a product covered by this warranty, Raytek will repair the instrument when it is returned by the purchaser, freight prepaid, to an authorized Service Facility within the applicable warranty period, provided Raytek’s examination discloses to its satisfaction that the product was defective.
-
Page 5: Description
A/D interfaces. Table 1-1: Models Note: When reviewing this manual, inquire of possible exceptions resulting from customized features. Check with your sales representative whenever a parameter is critical or oper- ation seems abnormal. Thermalert ET Series Operator’s Manual... - Page 6 – Sighting Tube, 305mm (12 in) Adjustable Bracket – Ceramic Sighting Tube, 305mm (12in) Swivel Bracket – Adjustable Pipe Adapter Accessory 110/220 to 12 VAC power supply – Blast Gate Accessory Figure 1-1: Accessories and Options Thermalert ET Series Operator’s Manual...
-
Page 7: Specifications
Nominal optical resolution values are stated at minimum 90% energy. Distance to size (D:S) ratios represent nominal values. 2LT, 3LT 2LT, 3LT Standard Focus Close Focus 2HT, 3HT 2P7, 3P7 Standard Focus Standard Focus 2HT, 3HT 2G5, 3G5 Close Focus Standard Focus Thermalert ET Series Operator’s Manual... -
Page 8: Output Ranges
G5 Versions 5.0 microns (nominal) HT Versions 2.2 microns (nominal) Accuracy ± 1% of reading or 1.4°C (2.5°F) @ 25°C (77°F) whichever is greater Repeatability ± 0.5% of Reading, ± 1 digit °C or °F Thermalert ET Series Operator’s Manual... -
Page 9: Operational
Type R Current Versions • all ranges: 4-20 mA • under or over specified operating temperature ranges: 20 mA • loop impedance, Max: 300 ohms Interconnection 5-pin DIN connector, 4.5 m (15 ft.) cable standard Thermalert ET Series Operator’s Manual... -
Page 10: Physical
• Length Standard: 178.3mm (7.02 in) Water-cooled housing: 178.3mm (7.02 in) • Diameter Standard: 56.8mm (2.24 in) Water-cooled housing: 75.7mm (2.98 in) • Weight Standard: 500 g (1.2 lbs) Water-cooled housing: 800 g (1.7 lbs) Thermalert ET Series Operator’s Manual... -
Page 11: Installation
The target spot size must contain the entire field of view of the sensor (Figure 2-1). It must be the same as or smaller than the desired spot size. Figure 2-1: Sensor Placement Thermalert ET Series Operator's Manual... -
Page 12: Ambient Temperature
• For additional protection, use conduit for the AC power lines and for any external connections. Note that solid conduit is better than flexible conduit in high noise environments. • Do not run AC power for other equipment in the same conduit. Thermalert ET Series Operator's Manual... -
Page 13: Wiring
See Figure 2-2 for thermocouple outputs; the longer the cable, the more likely differential hook-ups should be used. Figure 2-2: Multiple Sensors Thermalert ET Series Operator's Manual... -
Page 14: Mechanical Installation
See Section 1.0 for a description of accessories and options for the sensor. Figure 2-3: Sensing Head Figure 2-4: Fixed Mounting Bracket Figure 2-5: Adjustable Mounting Bracket Thermalert ET Series Operator's Manual... -
Page 15: Sensor (Air/Water-Cooled Housing)
NPT brass fitting and out the front aperture. Air flow should be a maximum of 0.5 to 1.5 liters/sec (1 to 3 cfm). Clean or “instrument” air is recommended to avoid conta- minants from settling on the lens. Figure 2-7: Air Purge Collar Thermalert ET Series Operator's Manual... -
Page 16: Thermojacket
315°C (600°F). The ThermoJacket’s rugged cast aluminum housing completely encloses the head and provides water cooling and air purging in one unit. Sensing heads can be easily installed or removed from the mounted ThermoJacket housing. Figure 2-8: ThermoJacket and Accessories Thermalert ET Series Operator's Manual... -
Page 17: Right Angle Mirror
Air Purge Collar and then screw on the Sighting Viewer Tool fully. Next, position and secure the bracket, being sure to remove the Sighting Viewer Tool when alignment is complete. Figure 2-10: Sighting Viewer Tool Thermalert ET Series Operator's Manual... -
Page 18: Electrical Installation
Customer supplied transformers will require the modifications shown in the following illustration. Note: Use 0.01µF/250 V AC capacitors for C1 and C2. An example is Sprague p/n125LS10 Ceramic Disk Capacitor. Figure 2-11: Stepdown Transformer Modifications Thermalert ET Series Operator's Manual... -
Page 19: Thermocouple Output Models
3. Connect a thermocouple meter to the output: white, yellow or black (+), red (-). Make sure the emissivity is less than 1.00. 4. Aim the sensor at objects with different temperatures. The thermocouple meter will respond to changes. Thermalert ET Series Operator's Manual... -
Page 20: Current Output Models
3. Set a digital voltmeter to measure at least 20 mA and connect it to the output (white [+], green [-]), and make sure the emissivity is less than 1.00. 4. Aim the sensor at objects with different temperatures. The meter will respond to these changes. 2-10 Thermalert ET Series Operator's Manual... -
Page 21: Operation
An EPROM is used to linearize the signals according to the required output task (e.g., thermocouple or current). The 12-bit signal is then fed to a digital-to-analog converter followed by a sample and hold circuit and an output amplifier. Figure 3-1: Theory of Operation Thermalert ET Series Operator's Manual... -
Page 22: Controls
The thermocouple and current output models have similar controls with the only exception being the addition of the Temperature Range Switch on the current output models. Both models have a default emissivity setting of .95. Figure 3-2: Control Panels Thermalert ET Series Operator's Manual... -
Page 23: Temperature Range
Temperature Range 1000 to 2000°F 1000 to 3000°F 500 to 1000°C 500 to 1700°C Note: LT models come in °F or °C versions. It is not possible to switch from °F to °C or vice versa. Thermalert ET Series Operator's Manual... -
Page 24: Emissivity Setting
This feature is particularly useful in obtaining a stable reading in noisy environments or measuring temperatures of objects with varying emissivity. The averaging filter should NOT be used in con- junction with the peak hold. Thermalert ET Series Operator's Manual... - Page 25 Figure 3-4: Signal Outputs (Standard, Peak Hold, Averaging) Thermalert ET Series Operator's Manual...
-
Page 26: Maintenance
The fail-safe operation is designed to provide a high output (20.3 mA) in the event the object temperature is above or below the temperature range (or subrange) of the sen- sor. It will also provide a high output in the event of certain internal failures to the sensor. Thermalert ET Series Operator's Manual... -
Page 27: Cleaning The Lens
Application assistance, calibration and repair service is available. The Service Department should be contacted before returning any equipment to allow for the most expeditious response time. In many cases, problems can be solved via tele- phone, telex or fax. We are at your service. Thermalert ET Series Operator's Manual... -
Page 28: Appendix A: Object Emissivity
These include the following: 1. Temperature 2. Angle of measurement 3. Geometry (plane, concave, convex, etc.) 4. Thickness 5. Surface quality (polished, rough, oxidized, sandblasted) 6. Spectral region of measurement 7. Transmissivity (i.e., thin film plastics) Thermalert ET Series Operator's Manual... - Page 29 0.5-0.9 Unoxidized 0.1-0.3 0.05-0.25 0.05-0.2 Rusted 0.6-0.9 0.5-0.8 0.5-0.7 Molten 0.4-0.6 — — Iron, Cast Oxidized 0.7-0.95 0.65-0.95 0.6-0.95 Unoxidized 0.25 Molten 0.3-0.4 0.2-0.3 0.2-0.3 Iron, Wrought Dull 0.95 Lead Polished 0.05-0.2 0.05-0.2 0.05-0.1 Rough Thermalert ET Series Operator's Manual...
- Page 30 0.7-0.9 0.7-0.9 Stainless 0.2-0.9 0.15-0.8 0.1-0.8 Tin (Unoxidized) 0.1-0.3 0.05 0.05 Titanium Polished 0.2-0.5 0.1-0.3 0.05-0.2 Oxidized 0.6-0.8 0.5-0.7 0.5-0.6 Tungsten 0.1-0.6 0.05-0.5 0.03 Polished 0.1-0.3 0.05-0.25 0.03-0.1 Zinc Oxidized 0.15 Polished 0.05 0.03 0.02 Thermalert ET Series Operator's Manual...
- Page 31 5. Mount sensor perpendicular to surface whenever emissivity is less than 0.9. In all cases, do not exceed angles more than 30 degrees from incidence. Thermalert ET Series Operator's Manual...
-
Page 32: Appendix B: Ce Conformity For The European Community
The instrument’s average error in this frequency range for the three orientations is 0.6° C at an electric field strength of 3 V/m. At some frequencies the instrument may not meet its stated accuracy. Thermalert ET Series Operator's Manual... - Page 33 Thermalert ET Series Operator's Manual...
Need help?
Do you have a question about the Thermalert ET Series and is the answer not in the manual?
Questions and answers