SIL-019 Infrared Sensor Conversion
Contents
1. be used to fine tune the temperature reading if needed Also in the Honeywell units filter may be used to smooth out the reading Note too much filtering will cause the display to become sluggish The new probe is high resolution It sees a 1 8 inch target at 60 inches The same rule of thumb applies with this probe as the old if you see material it will see material The lens on the new probe is glass and also has a protective glass lens that screws into the end of the probe A spare protective lens comes with the probe If it becomes necessary to clean the lens clean it with distilled water and a cotton swab Try not to scratch the lens Run 60 lbs of air pressure on the air purge at all times If the existing probe does not have an air purge then it will be necessary to add it Contact the Astec Service Department 423 867 3754 for instructions pertaining to your particular application WHEN USING WITH A HONEYWELL CONTROLLER If replacing an old probe that is connected to a Honeywell controller e The existing 500 ohm resister between terminals 25 and 27 of the Honeywell must be removed A 250 ohm resister must be installed between terminals 26 and 27 lt i CE N E R For thermocouple input 500 ohm resistor TeS eee po For 4 20 milliamp input 250 ohm resistor e The Honeywell temperature units will have to be reconfigured to accept the 4 20 ma input Please refer to SIL 002. 8 for a complete list of parameters and their values for a Honeywell UDC3300 These same values can be used in the UDC3000 DC300 and the DC330 models Astec Inc 2004
3. Service Information Letter SIL 019 Infrared Probe Conversion IT To TX Equipment All Raytek IT probes Date Issued 4 26 2004 Revised 6 21 04 Additional Raytec TX operation and service manual Revision 2 Reference By Rick Hodge Service Support Coordinator Astec Service Department and R L Worth Jr Service Support Coordinator PURPOSE The purpose of this letter is to provide a parts list and instructions for replacing the obsolete Raytek IT series infrared probe with the new Raytek TX probe It will also include set up instructions for the TX probe PARTS REQUIRED Quantity Astec Part Description 1 068172 Probe infrared 1 068173 Lens protective 1 064005 Collar 1 062968 Power Supply 24 Vdc 1 amp 1 063777 Rain cover FOR CABLES For stationary or hard wired systems As required 001966 Belden cable 8760 two conductor For portability plug in cable As required 008781 Belden cable 9418 four conductor 1 039882 Plug 17201MO3 l 039886 Receptacle 17204MO3 1 039897 Cap plug 17043MO3 l 039900 Cap Receptacle 17043MO3 1 042609 Backshell Flange 17043MO3 1 039890 Backshell Cable 17043MO3 When used with a Honeywell controller models 3000 330 or 3300 1 044432 250 ohm watt resister WIRING Turn off all power The new probe requires no external card it is self contained It operates on a 4 20 mA current loop It does requi
4. re an external power supply The unit will work with any temperature indicator that will accept this input To wire in the new probe using 2 conductor shielded cable belding make the following connections Positive output on the power supply goes to positive on the probe Infrared Sensor Negative on the power supply goes to negative on the temperature indicator Positive on the temperature indicator goes to negative on the probe Figure number 1 shows an example with the proper connects made INFRARED SENSOR TEMPERATURE INDICATOR ies iS ae ih a en OA a a POWER SUPPLY Figure 1 Proper connections On portable plants when the probe connection to the control house is made through a plug and receptacle the following pin out is standard for the aggregate temperature Please refer to Table 1 WIRE Shield TC1 T6A Spare Spare PIN NUMBER 1 2 3 4 5 Table 1 Wire numbers and pin connections GENERAL NOTES Under the cap on the back of the new probe are two rotary switches These are used to set the emissivity For most all applications a setting of 95 is desired Lowering this number will cause the temperature reading to be higher Raising the number will do the opposite It is common to have to lower the emissivity when using the protective lens and it is recommended to use the protective lens If using a Honeywell temperature indicator bias may
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