Technical Specifications

FAQ

1. What is the primary function of the 350500-00-00-00-01-01?

The 350500-00-00-00-01-01 is a Dynamic Pressure Charge Amplifier designed to process the charge signal generated by a piezoelectric dynamic pressure sensor. In combustion monitoring applications, the pressure sensor detects rapid pressure pulsations associated with combustion instability, and the charge amplifier converts the high-impedance sensor charge signal into a low-impedance voltage signal. The resulting voltage signal can then be transmitted to a suitable monitoring system for analysis, alarm processing, and machinery condition assessment.

2. What input sensitivity does the 350500-00-00-00-01-01 provide?

This configuration has an input sensitivity of 16 pC/psi, equivalent to 232 pC/bar. The input sensitivity must match the characteristics of the connected piezoelectric pressure sensor so that the amplifier can correctly convert the sensor charge into the expected voltage signal. When replacing an existing amplifier, the sensor’s charge sensitivity should be checked against the amplifier configuration before installation. An incorrect sensitivity setting can result in an output signal that does not accurately represent the actual dynamic pressure condition.

3. What is the output signal of the 350500-00-00-00-01-01?

The specified output sensitivity is 100 mV/psi, equivalent to 1.45 V/bar. The amplifier converts the high-impedance charge generated by the pressure sensor into a low-impedance voltage output that is easier to transmit to the monitoring system. The configuration provides a dynamic range of ±50 psi peak. The output circuit has a typical 50 Ω output resistance, allowing the processed signal to be connected to compatible monitoring equipment while maintaining suitable signal transmission characteristics.

4. What power supply does the 350500-00-00-00-01-01 require?

The amplifier operates from a negative DC supply. Without safety barriers, the specified supply voltage range is -19.60 to -26 VDC. When safety barriers are used, the permitted range is -17.75 to -26 VDC. The typical supply current is approximately 11.69 mA with no load, while the maximum specified current is 14.68 mA with no load. The power supply should be checked carefully during commissioning because an incorrect polarity or voltage outside the permitted range can prevent normal amplifier operation or potentially damage the connected instrumentation.

5. How should the 350500-00-00-00-01-01 be connected to a pressure sensor?

The pressure sensor is connected through the specified two-pin LEMO sensor connector. The sensor should be a compatible piezoelectric dynamic pressure sensor with characteristics matching the amplifier’s input sensitivity. The interconnect cable should be a suitable low-noise cable designed for dynamic pressure measurement. Because piezoelectric sensor signals can be sensitive to electrical interference, cable routing should avoid unnecessary proximity to high-power switching equipment and motor cables. Correct connector installation and proper cable shielding are important for maintaining signal quality in combustion monitoring applications.

6. What should be checked if the output signal from the 350500 is unstable or incorrect?

Start by checking the sensor connection, connector condition, cable continuity, and sensor compatibility. The pressure sensor sensitivity should correspond to the amplifier’s 16 pC/psi input configuration. Next, verify the negative DC supply voltage and confirm that it remains within the specified operating range. If the electrical connections are correct, inspect the cable routing for possible electromagnetic interference, especially where the sensor cable runs close to high-current power wiring. The monitoring system input should also be checked to ensure that its signal range and configuration are compatible with the 100 mV/psi amplifier output.

7. What is the maximum recommended cable length between the charge amplifier and monitor?

The specified maximum cable length between the 350500 charge amplifier and the monitoring device is 305 m, or approximately 1000 ft. A three-conductor shielded triad is recommended for field wiring. For longer cable runs, maintaining signal integrity becomes increasingly important because electrical interference, grounding problems, and cable characteristics can affect the low-level measurement signal. The cable should therefore be properly shielded and routed through an appropriate industrial installation environment. Connections should also be inspected carefully during commissioning to prevent intermittent signal problems.

8. Where is the 350500-00-00-00-01-01 commonly used?

The 350500 Dynamic Pressure Charge Amplifier is primarily used as part of dynamic pressure monitoring systems for applications such as gas turbine combustion instability monitoring. A typical system consists of a high-temperature piezoelectric pressure sensor, low-noise interconnect cable, charge amplifier, and monitoring device. The amplifier is particularly useful where rapid pressure pulsations must be converted into a stable electrical signal for condition monitoring. Its 35 mm DIN rail mounting and hazardous-area approval option also make it suitable for industrial control cabinets and power-generation environments where reliable dynamic pressure signal conditioning is required.