Several models, using both analog and digital circuitry, are available to interface engine-mounted flowmeters to cockpit rate indicators and totalizers. PC600 and PC800 series units support legacy systems, while the PC910/PC920 systems are designed to upgrade existing systems, and to provide an accurate link to new Flight Management Systems.

Features:

• Direct replacement for current legacy systems
• Interfaces with newer flight management systems with current instrumentation
• Established product history

Specifications

The PC910 (single) / PC920 (dual) series of signal conditioners conform to the requirements of FAA document TSO-C44b.

Flow Sensor Input:
Input full scale frequency range: 1600 Hz Max

Input:

• Input Type: Balanced
• Input Impedance: 20K ohms
• Input Sensitivity: 7 millivolts RMS at frequencies < 100 Hz

Temperature:
Temperature Sensor Type: RTD, Nickel 270 Alloy

Sensor Input:

• Temperature Sensor Resistance @ 25°C:1000 ohms +/- 1{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab}
• Temperature Coefficient: 6 ohms per °C
• Temperature Range: -67°C to 158°F
• (-55° to 70°C)

Totalizer Input:

• Output type: Solid-State switch to ground
• Current sink: 400 mA maximum
• Totalizer supply source: +28 vdc fuse protected
• Pulse width: 50 ms
• Rise/fall time: < 25/us
• Output frequency: dependant on scaling, 10 Hz maximum
• Accuracy: +/- 3{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of indicated total with fuel at nominal density, variations in fuel density from nominal will affect accuracy

Indicator Rate Output:

• Accuracy: +/- 3{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale flow rate with fuel of nominal density
• Fuel density variations from nominal will affect accuracy
• Linearity: +/- 1{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale
• Output Impedance: > 400K ohms

Auxiliary Analog Output:

• Type: Voltage output signal proportional to flow rate
• Full Scale Voltage: 5.000 or 5.333 vdc
• Slew rate: < 0.5 s from zero to full scale
• Accuracy: +/- 2.0{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale
• Repeatability: +/- 0.1{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale
• Linearity: +/- 0.2{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale
• Temperature Drift: +/- 0.01{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale per °F (+/- .02{cf45cea113033368483d38fb286aa921cdb0f50c649cb191fdaaa2ffe38c25ab} of full scale per °C)
• Output Impedance: < 1K ohms

Power Requirements:

• Voltage: +10 to 32 vdc
• Current: Each channel 75mA typical 100mA maximum, excluding totalizer current

Temperature Range:

• -22° to +122°F
• -30° to +50°C

Mating Connectors:

• J1 – MS3116F14-15S
• J2 – MS116F14-15SX