Sensors & Transmitters
Seven Star LLC supply Sensors and Transmitters is the UK and Irish distributor for a select group of quality manufacturers of humidity/dew point, air velocity and mass flow, gas sensors, temperature, differential pressure, moisture in oil and wireless sensors and transmitters and moisture meters
We have been helping customers; manufacturers, suppliers, and end users for over 5 years across many industries select the right sensor or transmitter solution for their application whether it be air quality monitoring, gas safety or process monitoring/analysis or moisture measurements in solids and welcome the opportunity to work with you.
Frequently Asked Questions
What are the advantages of using IO-Link enabled sensors over standard analog transmitters?
IO-Link is a bidirectional, digital point-to-point communication protocol that transmits precise measurement data immune to electromagnetic noise, unlike traditional 4-20mA analog signals. It also enables remote parameterization, dynamic threshold adjustments during product changeovers, and access to internal sensor diagnostics for predictive maintenance, significantly reducing downtime.
How does a tuning fork level switch function, and where is it typically applied?
A tuning fork level switch operates using a piezoelectric crystal to vibrate the fork at its resonant frequency; when the fork is submerged in a liquid or bulk solid, the frequency shifts, triggering a relay. This technology is highly reliable for point-level detection in silos and tanks, as it is unaffected by variations in fluid density, conductivity, dielectric constant, or turbulence.
What engineering considerations are necessary when selecting a pressure transmitter for highly corrosive media?
For highly corrosive media, engineers must specify wetted parts constructed from exotic alloys such as Hastelloy, Monel, or Tantalum, rather than standard 316L stainless steel. Alternatively, utilizing a chemical seal with an inert fill fluid and a non-reactive diaphragm (e.g., PTFE or gold-plated) provides a physical barrier, protecting the delicate sensing element from chemical degradation.
Why are smart transmitters preferred in modern distributed control systems (DCS)?
Smart transmitters feature onboard microprocessors that provide digital communication (such as HART, FOUNDATION Fieldbus, or PROFIBUS PA) superimposed over the analog signal. This allows the DCS to simultaneously acquire multi-variable measurements (e.g., mass flow, density, and temperature from a single Coriolis meter) while actively monitoring the transmitter's health and calibration status.
How do inductive proximity sensors behave differently when detecting non-ferrous metals versus ferrous metals?
Inductive proximity sensors utilize an oscillating electromagnetic field to detect conductive targets; however, their sensing range is dependent on the target's material. Non-ferrous metals, like aluminum or copper, exhibit lower magnetic permeability and cause less eddy current loss, resulting in a reduction factor that significantly decreases the effective sensing range compared to standard ferrous steel.