PTFM-1000V2

Pitot Tube Exhaust Flow Meter

The Pitot Tube Flow Meter, PTFM-1000V2 is a standalone interface for measuring exhaust gas flow rate of combustion engines. The system uses the tried-and-tested pitot tube principle with high-frequency transducers to accurately measure highly pulsating exhaust flows with a sampling rate of 1kHz. This rapid capture rate ensures that any pulsations or exotic behaviour in an engine is measured, and the unique design of the PTFM pitot tube means reverse flows can be measured with the same guarantee of sensitivity. The interface can be run standalone with a laptop, or seamlessly integrated to run alongside an analyser system without adding any more steps to the test cycle process.

Segment: Automotive

Division: Emission Measurement Systems

Manufacturing Company: HORIBA UK Limited

Features
Specifications

Key Features:

Direct exhaust measurement
The interface provides a real-time display of exhaust flow well within the accuracy requirements of ISO 16183.
No interference to engine operation
Fuel or air flow measurements are not required.
Eight sizes of flow tubes available
A range of flow tube sizes are available (for flows of 2-65m3) to best match a given engine’s paramaters and maximize accuracy.
Automatic flow tube type detection
The interface unit automatically detects the type of tube attached to it, and is instantly ready to use without any additional input from the operator.
Automated Zero and Purge Sequences
The interface can be set to automatically zero the differential pressure transducers before a test and backflush the piping after a test – the system is fully automated once integrated into a cell.
Non-Invasive Measurement
No sample is taken from the exhaust stream, so no compensation is required on the analyser’s end.
Annual calibration
The tubes and interface are calibrated separately, so the tubes can be interchanged between any interface.
Multiple data output options
10Hz analogue, RS-232 or LAN outputs are available.

Optional Features:

High Temperature Operation Exhaust pipe connections/seals are available for high temperature operation (900°C).
Exhaust Pressure Sensor (±10 kPa gauge) Additional sensor to measure tailpipe exhaust pressure.
Tailpipe Sample Fitting Integrated sampling point.

Test vehicle/engine	Diesel (HDD, LDD), Gasoline, LPG and CNG vehicles, Ethanol, Propane, Butane
Configuration	Interface unit connected to pitot tube via umbilical cable. Pitot tube can be standard (0 - 230ºC) or high temperature (0 - 900ºC)
Flow Rate Accuracy	Within ±1 % of full scale or ±1.5 % of readings (at flow rate of 20 % of full scale)
Linearity	Either of the following: (a) Within ±2.0% of full scale (b) Intercept: \|a0\| ≤ 1.0% of full scale Slope: 0.98 ≤ a1 ≤ 1.02 Standard estimated error: SEE ≤ 2.0% of full scale Coefficient of determination: R2 ≥ 0.990
Response Time	<1ms
Tube Attachments	Pitot tube size should be selected from the following list, according to tailpipe diameter and exhaust flow rate:
	Pilot Tube	Tube Diameter	Max Flow
	A-type	32.0 mm	2.0 m³/min
	B-type	42.7 mm	4.5 m³/min
	C-type	60.5 mm	10 m³/min
	D-type	76.3 mm	15 m³/min
	E-type	89.1 mm	20 m³/min
	F-type	101.6 mm	30 m³/min
	G-type	127.0 mm	45 m³/min
	H-type	152.4 mm	65 m³/min
Noise	Within 2.0% of full scale (at flow rate of 20% of full scale)
Repeatability	Within ±2.0% of readings (at flow rate of 20% of full scale)
Calibration	Interface calibrated every 12 months. Recommended pitot tube calibration every 12 months