INDUSTRIAL MEASUREMENT

TruTemp™ Turbine Temperature Monitoring System Integrates high-accuracy temperature data into your gas turbine test cell instrumentation The TruTemp system is built to help gas turbine manufacturers verify performance criteria involving engine thrust, reliability, efficiency and emissions while improving test cell throughput.

Operating in a test cell environment, the TruTemp measures thermocouple input voltages, cold junction RTD resistances and transmits the results over a high-speed serial link. The system combines UTR (Uniform Temperature Reference) technology with a voltage measurement system into one environmentally protected enclosure. Combining the measurement system and the reference plane, the TruTemp reduces the complexity of a thermocouple circuit-eliminating connectors and extension leads- reducing cost and improving accuracy and reliability.

Important Features
TruTemp can help deliver significant savings in test cell operating costs due to reduced calibration times and automatic thermocouple checking in the engine build or pre-rig shop. These checks identify reversed connections and other faults.

Benefits include: Fewer wires minimize possible connection errors and significantly reduce wiring installation costs over traditional wire run approaches Integrated system eliminates need for individual data acquisition systems and separate UTRs Rugged test-rig mounted design Test and calibration software simplifies set-up, calibration and pre-test Patented thermocouple diagnostics ensure integrity before test run State-of-the-art measurement technology ensures high data accuracy High speed data conversion (10 samples/channel/second) All units are synchronized by a common "heartbeat." 100-channel unit is a bolt-on replacement for GE Kaye 60-channel UTR

Obtain high accuracy in extreme test environments
TruTemp uses thermocouple input modules that provide overall measurement accuracy of ±0.25°C when mounted on or near the engine. Multiple 20 or 100 channel TruTemps can be configured in a single system. Designed to operate directly on your engine-mount structure, the system maintains accuracy through severe thermal changes, vibration and electromagnetic interference.

Save wiring costs with digital communications
Communicating via Bitbus™ (IEEE 1118), the integrated system saves the cost of running parallel thermocouple wire from the test article to your instrumentation-reducing installation costs 3 to 5 times over traditional wire run approaches. It also results in a lower cost replacement of conventional UTR installations. TruTemp requires only a simple communication cable to transmit measurement results to a host computer. The TruTemp eliminates the pair of copper leads for every channel and the separate measurement instrumentation required by conventional UTRs. It also eliminates the need for controlled environmental conditions required by other precision instrumentation systems.

Save time in set-up and testing
GE Kaye also provides software to make system set-up and checkout easy. A Test and Calibration Utility (TCU) provides software controllable setup, calibration, and diagnostics for the internal electronics and wired thermocouples. GE Kaye's patented technology provides for the quantitative measurement of thermocouple loop resistance and conductance to earth…dramatically improving test run validity.

Ethernet Support for TruTemp
GE Kaye provides a TruTemp Ethernet Gateway Module, which is a server to TCP/IP compatible clients. This gateway shields the client from all polling and time critical tasks and provides time-stamped data frames containing floating point results. Each synchronization pulse generates a time-stamped data frame in the gateway buffer.

The client need only issue a read command to request new data frames that have been buffered since the last request. The gateway provides a minimum of five seconds of buffering. UNIX library support is included.

TruTemp Specifications

System measurement accuracy	Root sum square (RSS) is less than ±0.2°C for normal operation over -20 to 60°C
System environmental error	Less than ±0.1°C due to 40°C dynamic environmental temperature change
Resolution	1µV on 60mV range; 0.5µV on 30mV range
Thermocouple input type	Any T/C type whose output relative to the system temperature is between -3mV and 62mV
A/D Converter	16-bit with 2.5ms integration time
Calibration	Provision for cold junction reference and voltage calibration. Automatic, dynamic recalibration of gain and zero to internal standards while at full measurement rate
Maximum scan rate	10 samples per channel per second
Network channel capacity	Any mix of 20- or 100-channel units up to 500 channels per network; Max of 100 channels per network to maintain 10 samples per channel per second throughput
Synchronization	All scanners are synchronized by a common RS-485 timing signal with a period of 100ms or greater
Communication	IEEE 1118 (Bitbus) shielded twisted pair
Vibration	Can be mounted on engine test frame structure. Tested at 5 to 24Hz, 0.04 inch pk-pk displacement; 24 to 300Hz, 2 inches per sec pk velocity; 300Hz to 3KHz, 3G pk acceleration; Shock 10G half-sine 11ms duration
Ambient temperature	-20 to 60°C to rated accuracy; storage to 80 C without damage; 95% non-condensing
Power requirements	24VDC power source with remote sensing; 7W per 20-channel unit, 35W per 100-channel unit
CMR noise rejection	120dB at 400Hz; 100dB at 50/60Hz
Overvoltage limit	±30V from any point to earth
Input impedance	100 MOhms in parallel with 500pF
Dimensions	20-channel unit; 493mm H x 171mm W x 132mm D (19.4" H x 6.7" W x 5.2" D); 100-channel unit, 493mm H x 418mm W x 132mm D (19.4" H x 16.5" W x 5.2" D)

To request printed literature or quotations, click here, call Sales at 1-800-964-5293 (US and Canada) or, contact your local sales representative.