The sensor means 24 preferably comprises at least one thermocouple 28, and is contained in a sensor housing 30. means for sending an electrical signal from the at least one thermocouple to an electronic control unit capable of indicating the air temperature. This can create particular problems when access to the flow path requires drilling through several inches of outer and inner casings of the compressor 11. On-off control is usually used where a precise temperature control is not necessary. This temperature can be read by placing an insulated temperature sensor (or thermocouple) on the discharge line about two to four inches from the compressor. The compressor’s discharge line temperature is often an overlooked temperature when troubleshooting a refrigeration or air conditioning system. Often less complicated than most electronic controls, temperature sensors and switches are relatively easy to set up. General Electric Company (Cincinnati, OH), 60/39.091, 73/112.05, 374/148, 374/E13.006, 374/144, 374/147, 374/148, 374/208, 73/117.3, 60/39.091, 60/39.093, Click for automatic bibliography Compressor Discharge Pressure Sensor. The high pressure air flows past at least one thermocouple in the housing and through a purge line. A tube or purge line 32 is connected to outlet 34 of sensor means 24 and allows air flow to a pyrometer 36. Low refrigerant charge in a refrigeration system is detected by monitoring the compressor discharge pressure and temperature. The resistance output of the temperature sensor changes with a corresponding temperature change of the parameter being monitored. a compressor having a compressor casing and further having compressor discharge via a flow path, the compressor discharge including high pressure air; a sensor contained in a sensor housing and mounted external to the flow path for receiving the high pressure air; at least one thermocouple mounted in the sensor housing for measuring the high pressure air temperature; a purge line located in an associated relation with the sensor to receive the high pressure air; means for returning the high pressure air to the flow path; and. Lubricant flash points also present a fire hazard. Browse our collection of air compressor accessory blogs. These sensors require access into the flow path through the compressor case. (T4) sensor, Compressor discharge temp. Air Compressors Additionally, improved steady-state compensation logic can be established in the ECU due to the constant k value, or ram recovery constant, and maximized thermal time constant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS. The compressor's discharge temperature should be measured about 1 to 2 inches away from the compressor on the discharge line. Unfortunately, this exposes the engine turbo-machinery to potential mechanical failures of the sensor which could cause it to fall into the flow path. This shuts down the system and prevents high temperature related damage. From there it is. (T1) sensor, Indoor coil temp. Consequently, the constant k factor and rapid time constant provide an optimal and repeatable compensation network for the T3 sensing system 22. An on-off controller will cut power or disengage the clutch when the temperature passes the set-point. A temperature switch senses temperature levels. If the temperature is too high, this is an indication of the loss of charge situation. Below 105° is an indication of flooding; b. (T2) sensor, Outdoor coil temp. The mounting pad 26 is situated at the high pressure compressor discharge area, which is the location at which the highest pressure in the engine cycle occurs. Hot Gas line Temperature 160°-200° a. As can be seen in FIG. These types of switches activate with a specific rise in temperature and are available with a wide range of temperature pre-set values as well as a set point range, set point tolerance, maximum temperature cut-out setting, and probe length. Therefore, through testing, a consistent k factor, i.e., ram recovery, can be established and input onto the ECU. FIG. A robust and reliable RTD offering calibration options for time-saving, ready to install RTD installations. Your session will expire in The air is then vented to a sink pressure and can be used as cooling or purge flow. Pt-100, single or dual element; Offers Callendar-Van Dusen constants for transmitter-sensor matching to provide the highest level of accuracy-321 to 1112°F (-196 to 600°C) However, it is a very important temperature because it is an indication of the amount of heat absorbed in the evaporator and suction line, and any heat of compression generated by the compression process. & Terms of Use. The two main components that control this reading are the temperature sensor and the outdoor board. Existing systems used to measure T3, i.e., compressor discharge, air flow are primarily thermocouple sensors mounted in the compressor flow stream. returning the high pressure air to the flow path. 2, the T3 sensing system 22 provides for a more accurate transient T3 signal. Another object of the present invention is to provide such a T3 sensing system wherein access into the direct flow path is not required. The T3 sensor 12, typically a thermocouple sensor, sends an electrical signal to an electronic control unit (ECU) (not shown) via leads 20, which is capable of indicating the air temperature. Privacy Policy The staging of the combustor is critical to meet the engine operability needs, i.e., flameout margin, and emissions goals. compressor air for combustion. In accordance with an alternative embodiment of the present invention, the exit flow is not restricted to use as a pyrometer purge flow, but could be used as motive flow for an ejector. It is seen from the foregoing, that the objectives of the present invention are effectively 10 attained, and, since certain changes may be made in the construction set forth, it is intended that matters of detail be taken as illustrative and not in a limiting sense. a discharge head temperature sensor to monitor discharge gas temperature. Share your knowledge of this product with other customers... Be the first to write a review. If your compressor trips on over temperature, it could be for any of the following reasons: Excessive oil temperatures can cause damage to your air compressor including premature lubricant degradation, high oil and moisture carryover, and varnishing of the compressor internals and system components (such as the oil filter, cooler, and separator filter). 1 there is illustrated a cross-section of a prior art T3 sensing system 10, which includes a partial cross-section of a compressor 11. CN802 QCN27 RED t. Check Point 2 . The actual discharge temperature can be approximated: ΔT actual = T 1 *[(P 2 /P 1) (n-1)/n – 1] / η p T 2 = T 1 + ΔT actual. The T3 sensing system 22 also provides purge flow for the pyrometer 36 site tube 42. … OEM Solutions Specifically, the T3 measurement is used in calculating air flow into the combustor. Room temp. The pressure ratio between the compressor discharge and the low pressure turbine is always greater than 2.5:1 for engine operating conditions. Privacy Policy On-off control is usually used where a precise temperature control is not necessary. Reset to a Lower temperature. a purge line associated with an outlet of the sensor for venting the air to a sink pressure to be used as cooling and purge flow. An on-off controller is the simplest form of temperature control device. Max oil temperature = 251°F. Temperature sensing element touching cold coil, located behind air filter. 59 Temperature Sensors. The cabin temperature sensor is used for detecting the average air temperature in the cabin and for allowing an accurate reading; a small fan is used to lead sample air to the sensor. By maintaining a constant Mach past the sensor, one of the variables is fixed. The CIT/CDP sensor (fig. The high pressure air flows past at least one thermocouple in the housing and through a purge line. A compressor discharge temperature sensing system senses compressor discharge temperature for a compressor located within a housing. Temperature below 160° after one-minute run time is … The cause of this can be a faulty sensor, a faulty board, or an actual fault in the refrigerant lines (i.e. Temperature sensors are often used for monitoring compressor coolant, oil and air inlet temperatures as well as discharge air temperatures and logging the variations. To maintain the security of your account a sign-out procedure has been initiated. The sensor means 24 sends an electrical signal to the electronic control unit (ECU) 31 via leads 20, capable of indicating the air temperature. When the temperature on the discharge tube exceeds the temperature indicative of a loss of charge, then the motor is stopped. These objects and other features and advantages will become more readily apparent in the following description when taken in conjunction with the appended drawings. 2 is a schematic diagram illustrating a T3 sensor system in accordance with the present invention. 2, a T3 sensor system 22 having a T3 sensor means 24, is illustrated, in accordance with the present invention. The present invention relates to aircraft engine systems and, more particularly, to a compressor discharge temperature (T3) sensing system as the baseline production design for a turbo-fan engine. 1 is a cross-sectional view illustrating installation into a flow path of a prior art T3 sensor system; and. VMAC air compressors are equipped with a switch which includes an oil temperature sensor. I came across a problem when calculating the compressor discharge temperature. generation, Temperature measurement in turbine engines, Method and apparatus for nonintrusively determining mach number, Purge air system for a combustion instrument, Method and apparatus for monitoring the temperature of the propulsion gas at the inlet to a high-performance turbine wheel, Means for calculating turbine inlet temperature of a gas turbine engine, TURBINE INLET TEMPERATURE SENSOR AND COMPUTER, <- Previous Patent (Motionless mixer tub...). If any of these two devices are faulty, it … Find a Dealer Crankcase Temperature 105°-125° a. blockage, kink, etc.). Viele übersetzte Beispielsätze mit "compressor discharge temperature" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen. a compressor located within a casing and having a compressor air flow path; a sensor contained in a sensor housing and mounted external to the flow path for extracting air external to the compressor casing; at least one thermocouple associated with said sensor housing for measuring the air temperature of the extracted air; and. Room temperature below 17 C(62 F). Product Code: TB-12-00284-00-AM. Referring now to the drawings, in FIG. A sensor mounted external to the flow path receives high pressure air discharged from the compressor. © 2004-2021 FreePatentsOnline.com. This process is never ideal. Additionally, the relatively slow air velocity into the compressor discharge area causes the sensor to have a relatively long time constant. The formula in the GASP is: T2=T1(P2/P1)^[(n-1)/n] The staging strategy is based in part on the combustor fuel-to-air flow ratio. Measure the resistance value of each winding by using the multi-meter. P9 -(OLF 19 Time) Cooling indoor Unit anti-freezing protection. An on-off controller is the simplest form of temperature control device. The thermocouples send an electrical signal to the electronic control unit (ECU) indicating the air temperature. The pyrometer 36 mounts over a second aperture at the outlet end 37 of the pyrometer in a low pressure area of the casing 18. Be very careful when doing this since the discharge line could be anywhere from 185 degrees F to 275 degrees F. The present invention has been developed to fulfill the needs noted above. When the temperature passes a set point the switch sends a signal to a controller to do something to the application, like cut the power, sound an alarm, turn on a light, or disengage the clutch. A mounting means 16 is used to bolt or otherwise install the T3 sensor 12 to compressor casing 18 of a jet engine. In the drawings as hereinafter described, a preferred embodiment is depicted; however, various other modifications and alternative constructions can be made thereto without departing from the true spirit and scope of the invention. The output from this type of device is either fully on or off, with no middle state. Some immersion temperature switches are appropriate for applications that require an inexpensive solution to simple temperature control. The Mach 1 air past the thermocouples 28 maximizes the heat transfer coefficient of the thermocouples, thus minimizing the sensor time constant. If a critical temperature is reached, the module energizes a long life injection valve which meters a controlled amount of saturated refrigerant into the compressor suction cavity to cool the suction gas. This type of controller uses a latching relay, which must be manually reset, and is used to shut down a p… First off, if your discharge temperature (as measured with a thermometer at the compressor) is over 225, you have an issue. providing a compressor located within a casing and having compressor discharge via a flow path, the compressor discharge including high pressure air; providing a sensor housed in a sensor housing and mounted external to the flow path for receiving the high pressure air; flowing the high pressure air past at least one thermocouple contained in the sensor housing for measuring the high pressure air temperature; connecting a purge line to an outlet of the sensor for venting the air to a sink pressure to be used as cooling and purge flow; and. Cooling may not occur until room temperature rises above 17 C(62 F). A sensor is provided for monitoring temperatures within a discharge tube on a scroll compressor. The system is sized to guarantee choked flow (Mach=1) at the T3 sensor orifice 40 for all engine operating conditions. Maximum suction superheat = 35°F* * Typical suction superheat = 12 -14°F. On compressors ZHW08K1P and ZHW16K1P, a temperature sensor is located internally in the discharge port of the fixed scroll. For example, excessive discharge temperature might cause metal fatigue of the valves and thermal stress of the lubricant. Consequently, high pressure air from the compressor discharge flows into the T3 sensor 24 past the thermocouples 28, through the purge line 32, into the pyrometer 36, then back into the engine flow path 14 in the low pressure turbine, as indicated by arrows 38. PU -(OLF … The ejector could draw in cooler undercowl temperature air and be used as a cooling flow for another component. An aperture (not shown) is drilled into the compressor casing 18 at this location, and the T3 sensor means 24 is mounted over this aperture. The high compressor discharge temperation protection will be triggered when the outdoor unit reads a high temperature for the compressor discharge. Compressor Inlet Temperature/ periphery of the nozzle tip. Compressor shut-off by changing modes. Air Conditioning Coil Compressor Discharge Temperature Sensor , Find Complete Details about Air Conditioning Coil Compressor Discharge Temperature Sensor,Air Conditioner Temperature Sensor,Air Compressor Discharge Sensor,Temperature Sensor from Supplier or Manufacturer-Xiaogan Huagong Gaoli Electron Co., Ltd. P8-(OLF 18 Time) Compressor discharge Temperature overheat protection. a purge line connected to an outlet of the sensor for venting the air to a sink pressure to be used as cooling and purge flow. The T3 sensor means 24 is mounted to the compressor casing 18 on a mounting pad 26. The T3 sensor system 22 does not require access into the direct flow path 14, so engine turbo machinery is not exposed to potential mechanical failures of the sensor which can cause the sensor to fall into the flow path. When the discharge gas temperature is above 230°F, additional oil cooling should be used. A limit controller is an on-off controller used for alarm indication. Price Range: Rs.1000 - … (T5) sensor. The evaporator temperature sensor or switch is a component commonly found on many road going vehicles. When using the GPSA databook to calculate a single stage centrifugal compressor discharge temperature, the result is much higher than that we gained using the simulation software ProII or a compressor sizing program. Check coil of EEV Remove connector, check each winding resistance Of Coil Read wire White - Red Yellow - Red Pack temperature control: - up to 180C (385F): normal operation, - 180C to 220C (428F): the ram air inlet flap opens more in … This long time constant leads to significant inaccuracies, on the order of 10-15%, in measuring the air temperature during critical transient maneuvers of the aircraft engine. Figure 2 shows the discharge temperatures for all the refrigerants during the tests of compressor 1 when it was run in the air-source air conditioning split system. The electronics system uses temperature sensors and pressure transducers to monitor the compressor operation. Temperature switches and sensors are used on applications which require a solution to a temperature control situation. Referring now to FIG. A compressor discharge temperature sensing system senses compressor discharge temperature for a compressor located within a housing. This type of controller uses a latching relay, which must be manually reset, and is used to shut down a process when a certain temperature is reached. This monitoring is accomplished with a combined pressure/temperature sensor located at or near the compressor outlet. Your session will expire in The output from this type of device is either fully on or off, with no middle state. If the compressor oil gets too hot, the switch sends a signal to the on-off controller to disengage the air compressor’s clutch. The costs related to rectifying these issues through the use of temperature switches and controls can result in significant cost-savings, as risks of down-time and injury are minimized. The discharge of the compressor is the hottest part of the system. Interested in learning more about air compressor components and accessories? In accordance with the present invention, for a turbo-fan aircraft engine application, the T3 sensor 24 is mounted near the high pressure compressor discharge axial plane of the engine. A limit controller is an on-off controller used for alarm indication. The maximum acceptable inaccuracy is approximately 2-3% during engine transients. Hence, every sensing element has a ram recovery factor that is a function of Mach number and the sensor physical characteristics. Continuing with FIG. About Us All rights reserved. HVAC training is required!https://www.facebook.com/profile.php?id=100009858663026 This process controls the discharge temperature to a safe level. Min suction superheat = 5°F. The air is ported into a housing containing the thermocouples which measure the air temperature. The compressor discharge temperature protection is triggered when the temperature sensor on the discharge tube of the compressor reads too high of a value. TB-12-00284-00-AM SENSOR COMPRESSOR DISCHARGE TEMPERATURE : Our Price: $ 34.00. The sensor housing 30 is affixed onto the compressor casing 18 by suitable means, such as a plurality of bolts which screw into the compressor casing 18 through the mounting pad 26. 3-18, item 11) senses both CIT and CDP. This discharge temperature should never exceed 225°F. The sensing system 10 includes a T3 sensor 12 situated in the compressor air flow path 14. The evaporator sensor is used for detecting the cooling capacity. & Terms of Use. 1, the T3 sensor 12 requires access into the flow path 14 through the compressor case 18. Articles (T3) sensor, Outdoor ambient temp. The ability of the sensor 24 to stop the forward motion of the air and recover the velocity head in terms of total temperature is called ram recovery. To maintain the security of your account a sign-out procedure has been initiated. Straighten tube away from coil. The system extracts air from the compressor discharge plane through a hole bored into the case. 2.2 CS Screw Compressor Cycling Rates: BITZER CS Screw Compressor … Carbonization and oil breakdown can occur if compressor discharge temperatures exceed 225°. Support Qty: Description SENSOR COMPRESSOR DISCHARGE TEMP. An on-off controller will cut power or disengage the clutch when the temperature passes the set-point. 4. The discharge gas temperature can be accessed through the Modbus. sprayed into the combustion liner and mixed with. Another object of the present invention is to provide a more accurate transient T3 signal. It is therefore highly desirable and an object of the present invention to provide a T3 sensing system which provides improved compensation and may be mounted external to the flow path. The temp erature sensors used to meas ure compressor temperatures are thermistor type devices. Banking on the skills of our qualified team of professionals, we are instrumental in offering a supreme quality range of Air Compressor Temperature Sensor. The compressor discharge temperature sensor signals the compressor outlet temperature to the ACSC for pack temperature control and overheat detection. The present invention is a T3 sensing system mounted external to the flow path. A sensor mounted external to the flow path receives high pressure air discharged from the compressor. Temperature switches are slightly more complex, and include a sensor plus the ability to send signals. The thermocouple measures the high pressure air temperature and the high pressure air is then returned to the flow path. Excessive discharge gas temperature will cause the drive to trip the compressor. By minimizing the sensor time constant, only a small amount of transient compensation is required. Compressor discharge temperature and pressure might have an impact on compressor reliability. Contact, Direct-Transmission Mounted Multi-Power Systems, Multifunction – 6-In-1 Power System – Kubota, Multifunction – 6-in-1 Power System – Cat, Multifunction – Compressor-Generator Power System, Multifunction – Compressor-Generator-Welder Power System, Multifunction – Compressor-Hydraulic Power System, Multifunction Power System – Your Power, Your Choice, collection of air compressor accessory blogs, Ambient temperature too high or not enough ventilation, Restricted air flow over the air to liquid cooler, Too high an engine liquid coolant supply temperature in a liquid to liquid cooler. At that temperature on the discharge line you will have an internal compressor temperature of over 300°and the oil will begin breaking down, so if you check for no other reason, check to make sure you are under 225. Also, the rapidity of the time constant allows greater margin for compensation error without significantly affecting the indicated temperature measurement. Above 125° is an indication that the compressor is running too hot- generally caused by the high oil levels; 5.