Kelco Engineering CR22 Microwflow Switch The CR22 microflow switch is a compact inline flow sensor designed to detect low flows. Its main application is in detecting
loss of flow in chemical metering and injection systems. The CR22 is made from PVC with Viton seals, making it ideal for use with commonly used water treatment reagents.
The Descriptions of Kelco Engineering CR22 Microwflow Switch
The CR22 microflow switch operates on the displaced piston principle. Process liquid passing through the switch lifts a precision piston. Every time the piston is lifted a magnet sealed inside it actuates an external reed switch. The reed switch provides a signal indicating flow. The CR22 can be setup as a Normally On or a Normally Off switch that responds either to flow or to loss of flow.
The sensitivity to flow of the CR22 microflow switch is not adjustable. It is partially fixed and partially a function of several variables. The actual flow rate that the CR22 can detect is affected by the fixed geometry of the switch and by the viscosity of the process liquid. In general, liquids of an SG> 1.0 or kinematic viscosity of >1.0 will proportionally increase the sensitivity of the switch, and slow down its response time. Low-viscosity liquids will have the reverse effect. The CR22 is not suitable for use with highly viscous liquids.
The Features of Kelco Engineering CR22 Microwflow Switch
- Can detect flows of less than 500 mL per Hour
- Maximum flow rate of 4L per Minute
- Suits tube and pipes from 6mm to 20 mm
- All wetted parts UPVC with VITON® seals
- Compact vertical position mounting
- 18 Bar 260PSI Pressure rating
- Fast response to flow loss
- Easy to install and service
- Simple and reliable
- Weatherproof
Applications
Flow, or loss of flow detection, is a critical part of many scientific and industrial applications. Due to its robust construction and high sensitivity, the CR22 microflow switch is suitable for the detection of flow or loss of flow in a variety of liquids including most mineral salts and many acids and bases.
The wetted parts of the CR22 are made from UPVC with Viton Oring seals. There are no metal parts within the wet area of the switch. The switch can only be used with clean liquids that are free from suspended solids larger than 30 microns, and free from particulates or sludge residue that is attracted to magnets. Materials such as Ferric solutions, organic solvents, esters, and keytones in general should not be used with the CR22 microflow switch.
Source: kelco.com.au
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