Summary of Contents for SURREY MUHW-1A
- Page 1 ULTRA-MINIATURE HOT WIRE ANEMOMETER SYSTEM User Manual WARNING Read this document before using the product. This is an experimental prototype, for measurement purposes only. This system is not certified for use on aircraft.
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Page 2: Table Of Contents
© Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com Contents INTRODUCTION ........................... 1 DETAILED SPECIFICATION ....................... 2 PHYSICAL CONNECTIONS AND CONTROLS ............... 3 OPERATION ..........................4 CARE AND HANDLING ........................ 8 TECHNICAL SUPPORT ....................... 8 Version Control Version... -
Page 3: Introduction
© Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com 1 INTRODUCTION Principle of operation The system consists of a compact, assembled constant-temperature hot-wire anemometry system on a printed circuit board (PCB) which can directly drive a standard third-party hot- wire probe, with miniaturized user-accessible controls. -
Page 4: Detailed Specification
© Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com 2 DETAILED SPECIFICATION Product code MUHW-1A Velocity range min. 0 m/s max 120 m/s Maximum bandiwdth 40 kHz 3.5 ± 1 Wire cold resistance range (fixed) Overheat ratio (fixed) Power requirement min. -
Page 5: Physical Connections And Controls
© Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com 3 PHYSICAL CONNECTIONS AND CONTROLS There are four conductor pins in the analogue connector; pin 1 is identified by a triangle recessed into the connector housing. Connector Terminal Description There are four pins: Vout (1), aGND (2), GND (3) and V+ (4), where pin 1 is on the left with the board facing upwards. -
Page 6: Operation
© Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com To insert a probe into the unit, carefully push the probe terminal pins into the socket on the narrowed side of the probe. The probe will be held in place by friction in the connector. For most applications, additional mechanical support for the probe is required. - Page 7 © Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com frequency response the correct setting is that which provides a critically damped response (i.e. no undershoot): see figures 2 - 5. Figure 2: Underdamped response Figure 3: Single undershoot (maximum bandwidth)
- Page 8 © Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com Figure 4: Critically damped (best flat-response) Figure 5: Overdamped response External compensation network (optional) With a 1:1 bridge ratio, the external compensation network can simply be an exact duplicate of any extension cable used for the hot-wire probe except with a short circuit at the end rather than a hot-wire.
- Page 9 © Surrey Sensors Ltd. (2025) Hot-Wire Anemometry System User Manual www.surreysensors.com Voltage drop across the power supply cable Since the system idle current alone is on the order of 0.1 A, care must be taken to ensure the voltage drop across the power supply cable is not so high as to cause the supply voltage at the device to be less than the minimum of 4.5 V.
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Page 10: Care And Handling
The content of this user manual is for general information only and is subject to change without notice. It may contain inaccuracies or errors and Surrey Sensors Ltd. expressly exclude liability for any such inaccuracies or errors to the fullest extent permitted by law. Your use of any information is entirely at your own risk, for which Surrey Sensors Ltd.
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