Armfield Engineering Education

Hydraulic Research Instruments

H series - Issue 3
H33-1 H33-2 H33-3 - Miniature Propller Probes

Each probe consists of a sensing head that is mounted at the end of a slim stainless steel stem. A co-axial connector at the top of the stem allows the probe to be connected to the H33-10 Digital Indicator.

ORDERING SPECIFICATIONS

H33-1:
Is a straight, low speed probe for measuring horizontal velocities in the range 25 to 1500mm/sec.

H33-2:
Is a straight, high speed probe for measuring horizontal velocities in the range 600 to 3000mm/sec. This probe is fitted with streamlined fairing to provide additional strength and freedom for turbulence at higher velocities.

H33-3:
Is a 90° angled, low speed probe for measuring vertical velocities in the range 25 to 1500mm/sec.

Description

The sensing head consists of a 5-bladed propeller that runs in jewelled bearings. The propeller is able to rotate freely within a protective shrouded cage. An insulated gold electrode terminates 0.1mm from the tip of the rotating blades and detects the change in electrical impedance as each blade passes. As there is no physical contact between the electrode and blade, the propeller can rotate freely and respond to low velocity of the surrounding fluid.

Specification

Rotor: 11.6 mm diameter, machined plastic (balanced)
Spindle: Hardened stainless steel with conical ends
Bearings: Synthetic sapphire vee jewels
Cage: Nickel plated bronze
Stem: Stainless steel
Electrical connector: Co-axial
Weight: 0.20kg
Immersion length: 420mm maximum

Accessories

H1-11-A: Adjustable Tripod Stand with mountings

Shipping specification

Volume: 0.1m³
Gross weight: 2kg

Extended 2 year Warranty on all Armfield Products

DATA SHEET

PRODUCT CATEGORY:
Engineering Education