Description
The FS Series sensors provide precise reliable force sensing performance in a compact commercial grade package at a cost effective price. The sensor features a proven sensing technology that uses a specialized piezoresistive micromachined silicon sensing element. The low power, unamplified, uncompensated Wheatstone bridge circuit design provides inherently stable mV outputs over the force range.
Force sensors operate on the principle that the resistance of silicon- implanted piezoresistors will increase when the resistors flex under any applied force. The sensor concentrates force from the applications, through the stainless steel ball, directly to the silicon-sensing element. The amount of resistance changes in proportion to the amount of force being applied. This change in circuit resistance results in a corresponding mV output level change.
The sensor package design incorporates patented modular construction. The use of innovative elastomeric technology and engineered molded plastics result in load excitation capacities of 4.5/5.5 kg over-force. The stainless steel ball provides excellent mechanical stability and is adaptable to a variety of applications. The FSS sensor delivered 20 million operations in Mean Cycles to Failure (MCTF) reliability testing at 50 °C [122 °F]. This test determines the number of possible sensor operations at full scale until failure. Various electric interconnects can accept prewired connectors, printed circuit board mounting, and surface mountings. The unique sensor design also provides a variety of mounting options that include mounting brackets, as well as application specific mounting requirements.
PERFORMANCE CHARACTERISTICS @ 5.0 ± 0.01 Vdc Excitation*, 25 °C [77 °F]
| Parameter | Min. | Typical | Max. | Units |
| Null Offset | -15 | 0 | +15 | mV |
| Operating Force | 0 | – | 1500 | grams |
| Sensitivity. | 0.1 | 0.12 | 14 | mV/gram |
| Linearity (B.FS.L.)** | – | ± 1.5 | – | % span |
| Repeatability @ 300 g | – | ± 10 | – | grams |
| Null Shift | ||||
| 25 °C to 2 °C [77 °F to 35.6 °F] | – | ± 0.5 | – | mV |
| 25 °C to 40 °C [77 °F to 104 °F] | – | ± 0.5 | – | mV |
| Sensitivity Shift | ||||
| 25 °C to 50 °C [77 °F to 122 °F] | – | 5.5 | – | % span |
| 25 °C to 0 °C [77 °F to 32 °F] | – | 5.5 | – | % span |
| Input Resistance | 4.0 K | 5.0 K | 6.0 K | Ohms |
| Output Resistance | 4.0 K | 5.0 K | 6.0 K | Ohms |
| Overforce | – | – | 4,500 | grams |
| ESD (direct contact, terminals and plunger) | 8 | – | – | kV |
* Non-compensated force sensors, excited by constant current (1.5 mA) instead of voltage, exhibit partial temperature compensation of Span.
** BFSL: Best Fit Straight Line
ENVIRONMENTAL SPECIFICATIONS
| Operating temperature | -40 °C to 85 °C [-40 °F to 185 °F] |
| Storage temperature | -40 °C to 100 °C [-40°F to 212 °F] |
| Shock | Qualification tested to 150 g |
| Vibration | Qualification tested to 0 to 2 kHz, 20 g sine |
| MCTF | 20 million at 25 °C [77 °F] |
| Solderability | 5 sec at 315 °C [599 °F] per lead |
| Output ratiometric | Within supply range |
Note: All force related specifications are established using dead weight or compliant force.
SENSOR PINOUT
MOUNTING DIMENSIONS (for reference only) mm/in
