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Occlusion Sensors in Medical Devices: An In-Depth Overview

An engineering-focused technical note about what occlusion is and what sensors SMD has to offer when it comes to measuring and detecting occlusion throughout a wide variety of applications.

S610 Application Notes

The S610 Load Cells are aluminum-bodied assemblies containing a monolithic sensing element with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 0‐100g up to 100lbs.

S410 & S415 Application Notes

The S410 and S415 load cell sensors are monolithic stainless steel or aluminum bodied structures with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 0‐ 900g up to 10Kg.

S220 Application Notes

The S220 Load Cell Sensors are monolithic stainless steel-bodied structures with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 6 or 12 lbs.

S230 Application Notes

The S230 Load Cells are monolithic stainless steel-bodied structures with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 20 or 40 lbs

S215 Application Notes

The S215 Load Cells are monolithic stainless steel-bodied structures with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 2 to 22 lbs

P571 Application Notes

The P571 Pressure Sensors are monolithic stainless steel-bodied pressure sensors with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 100 psi to 15,000 psi

S300 Application Notes

The S300 Load Cells are monolithic stainless steel-bodied structure with a proprietary thin-film technology strain gauge applied, capable of producing an analog voltage output in response to loadings of up to 10, 30, and 80 grams

P940 Application Notes

The P940 Pressure Sensors are monolithic stainless steel-bodied pressure sensors with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 50 psi to 6,000 psi

S400 – S401 – S402 – S420 Application Notes

The S400, S401, S402, & S420 Load Cells are a family of stainless steel-bodied assemblies containing a monolithic sensing element with a strain gage applied, capable of producing a linear, analog voltage output in response to loadings of 0‐50 lbs up to 1000 lbs

S100 Application Notes

The S100 Load Cells are monolithic aluminum or stainless steel-bodied structures with a proprietary thin-film technology strain gauge applied, capable of producing a linear, analog voltage output in response to loadings of 0.2 N up to 125 N

Sinking VS Sourcing Digital Outputs – Float Switches

A sinking digital (input/output) provides a grounded connection to the load, whereas a sourcing digital(input/output) provides a voltage source to the load.

Custom Tubing for Standard Bubble Sensors

Proper bubble sensor functionality is partially dependent on the tubing that is used with it this resource helps you to customize your tubing for your bubble sensor

Specific Gravity And The Right Float Switch Selection

Understanding Specific Gravity & Float Switch Selection Specific Gravity in liquid level measurement refers to the ratio of the density of a substance within a tank. For fluid monitoring levels, this factor is an important one to consider as it …

Float Switches- Normally Open vs Normally Closed

Float Switches- Normally Open verses Normally Closed And why you should care… Float switches, in very basic terms, are used to detect the presence or absence of liquid (or another substance) in a tank. By measuring the level, it’s possible …

S256 Load Cell Application Notes

S256 Force Sensor Application Notes  General Description: The S256 Force Sensor is a monolithic aluminum bodied structure with a proprietary thin film technology strain gauge applied, capable of producing an analog voltage output in response to loading of up to …

S251 & S252 Application Notes & Mounting Suggestions

S251 & S252 Application Notes & Mounting Suggestions General Description: The S251 and S252 Sensor is a family of monolithic aluminum or stainless steel bodied structures (depending on capacity) with a proprietary thin film technology strain gage applied, capable of …

Technical Note: Signal Conditioning – I2C Output

Technical Note: Signal Conditioning – I2C Output I2C (Inter-Integrated Circuit) is a communication protocol that is often used to transfer data from sensors to processors and micro-controllers. Many of our sensors are provided with an I2C output or can be …

Technical Note: Combined Bubble and Occlusion Sensors

Combined Bubble and Occlusion Sensors Strain Measurement Devices has core competencies in load cells, ultrasonic sensors, electronics design, and mechanical design, because of our robust sensor lines we have the unique opportunity for space saving, combined sensors. Solving multiple sensor …

Technical Note: Bubble Sensors – Tubing Selection

Bubble Sensors – Tubing Selection Strain Measurement Devices’ standard bubble sensors will function with almost any soft or semi-rigid plastic or rubber tube. However, SMD can also design sensors for almost any tubing material. The main considerations with any tube …

Technical Note: Bubble Sensors – Bubble Size Calibration

Bubble Sensors – Bubble Size Calibration Do I need a calibrated bubble sensor? Many applications only require knowing whether the tube is full of air or water, i.e. gross air detection; the size of the minimum bubble detected is often …

Technical Note: Bubble Sensors – Test Pin

Bubble Sensors – Test Pin SMD Bubble Sensors have an optional test pin that is often required for medical device applications. On our standard sensors, the last digit of the part number denotes whether the test pin is enabled or …

Technical Note: Bubble Sensors – Technology Overview

Bubble Sensors – Technology Overview What is the operating principle for SMD (Strain Measurement Devices) bubble sensors? Most SMD sensors are designed to operate non-invasively through the walls of a tube without the use of grease or other acoustic coupling …

Technical Note: S251 Overload Proof Assembly

Purpose: This mounting and loading scheme protects the sensor from overloading forces in tension, compression and torsion

S100 Overload Stop Mount Technical Note

Purpose: This mount protects the sensor from damage by side and compression loads larger than full scale.

Technical Note: Rig Tension Sensor series of Dead-Eyes

Technical Note: Rig Tension Sensor series of Dead-Eyes Strain Measurement Devices, a world leader in thin film strain gages, introduces the world’s most highly engineered group of Dead Eye and Rig Tension Sensors.   Using our sensor and strain gauge design …

Technical Note: Overload Proof Low Profile Platform Scale Sensor

Low force range (450 grams to 9Kg) center point load cells

Technical Note: Resolution and Accuracy

Resolution deals with the lowest force or voltage detectable

Accuracy means resolving that detected force and reliably normalizing it to an (international) standard.