FSG Series Force Sensor DESCRIPTION The FSG Series Force Sensor provides precise, reliable force The sensor package design incorporates patented modular sensing performance in a compact commercial-grade construction. The use of innovative elastomeric technology and package. The sensor features a proven sensing technology engineered molded plastics results in overforce capacities of that utilizes a specialized piezoresistive micro-machined silicon up to three times the rated force. sensing element. The low power, unamplified, non- compensated Wheatstone bridge circuit design provides The stainless steel plunger provides excellent mechanical inherently stable mV outputs over the 5 N, 10 N, 15 N and 20 N stability and is adaptable to a variety of applications. Various force ranges. electric interconnects can accept prewired connectors, printed circuit board mounting, and surface mounting. The unique Force sensors operate on the principle that the resistance of sensor design also provides a variety of mounting options that silicon-implanted piezoresistors will increase when the include mounting brackets. resistors flex under any applied force. The sensor concentrates force from the application, through the stainless steel plunger, 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. FEATURES AND BENEFITS POTENTIAL APPLICATIONS Medical Extremely low deflection (approx. 30 m typical at Full Scale) helps reduce measurement error Infusion pumps Low repeatability error ( 0.2% span) improves overall Ambulatory non-invasive pumps system accuracy Occlusion detection Low linearity error ( 0.5% span) improves system Kidney dialysis machines accuracy over the entire force range Enteral pumps Low off-center loading errors improves system accuracy Industrial due to mechanical misalignment Resolution to 0.0098 N improves customers system Load and compression sensing accuracy Variable tension control Fast response time allows system to make faster Robotic end-effectors decisions which may improve system accuracy Wire bonding equipment Low power consumption allows use in battery applications High ESD resistance of 8 kV) reduces special handling during assembly FSG Series 1 Table 1. Performance Characteristics (At 10 0.01 Vdc, 25 C 77 F .) FSG005WNPB FSG010WNPB FSG015WNPB FSG020WNPB Characteristic Unit Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Force sensing range N 0 to 5 0 to 10 0 to 15 0 to 20 2 Excitation Vdc 3.3 10 12.5 3.3 10 12.5 3.3 10 12.5 3.3 10 12.5 3 Null offset mV -30 0 +30 -30 0 +30 -30 0 +30 -30 0 +30 4 Null shift mV 0.5 0.5 0.5 0.5 (25 to 0, 25 to 50 C) 5 Span mV 310 360 395 310 360 395 310 360 395 310 360 395 6 Linearity (BFSL) % span 0.5 0.5 0.5 0.5 7 Sensitivity mV/V/N 6.6 7.2 7.8 3.3 3.6 3.9 2.2 2.4 2.6 1.65 1.8 1.95 8 Sensitivity shift % span 5.0 5.0 5.0 5.0 (25 C to 0, 25 C to 50 C) 9 Repeatability % span 0.2 0.2 0.2 0.2 Response time ms 0.1 0.5 0.1 0.5 0.1 0.5 0.1 0.5 (10 %FS to 90 %FS) Input resistance k 4.0 5.0 6.0 4.0 5.0 6.0 4.0 5.0 6.0 4.0 5.0 6.0 Output resistance k 4.0 5.0 6.0 4.0 5.0 6.0 4.0 5.0 6.0 4.0 5.0 6.0 Plunger deflection m 31 40 51 63 10 Overforce N 15 30 45 60 Notes: 1. All force-related specifications are established using dead weight or compliant force. CAUTION 2. The range of voltage excitation which can be supplied to the product to produce an output which is proportional to force but due to ratiometricity errors may not remain within the specified performance EXCEEDING PRODUCT limits. Non-compensated force sensors, excited by constant current (1.5 mA) instead of voltage, exhibit OVERFORCE RATING partial temperature compensation of span. 3. The output signal obtained when the zero force is applied to the sensor. Also known asnul orzer. Ensure the overforce 4. The change in the null resulting from a change in temperature .It is not a predictable error as it can shift up and down from unit to unit. Change in temperature causes the entire output curve to shift up or down ratings given in Table 1 along the voltage axis. are not exceeded 5. The algebraic difference between output signals measured at the upper and lower limits of the operating force range. Also known asfull scale outpu or simplyspa. during any phase of 6. The maximum deviation of product output from a straight line fitted to output measured over the operating sensor assembly to the force range. The straight line through a set of points which minimizes the sum of the square of the deviations of each of the points from the straight line. board, as well as during 7. The ratio of output signal change to the corresponding input force change. Sensitivity is determined by the use of the sensor in computing the ratio of span to the specified operating force range multiplied by the supply voltage being used. the application. 8. The maximum deviation in sensitivity due to changes in temperature over the operating temperature Failure to comply with range, relative to sensitivity measured at 25 C. these instructions may 9. The maximum difference between output readings when the same force is applied consecutively, under the same operating conditions, with force approaching from the same direction within the operating result in product force range. damage. 10. The maximum force which may safely be applied to the product for it to remain in specification once force is returned to the operating force range. Exposure to higher forces may cause permanent damage to the product. Unless otherwise specified, this applies to all temperatures within the operating temperature range. Table 2. Environmental Specifications Characteristic Parameter 1 Operating temperature -40 C to 85 C -40 F to 185 F Shock qualification tested to 150 g Vibration qualification tested to 0 Hz to 2 kHz, 20 g sine 2 MCTF (Mean Cycles to Failure) 20 million at 25 C 77 F Output ratiometric within supply range Notes: 1. The temperature range over which the product may safely be exposed without excitation or force applied. Under these conditions the product will remain in specification after excursion to any temperatures in this range. Exposure to temperatures beyond this range may cause permanent damage to the product. 2. MCTF is a basic measure of reliability for a non-repairable device. It is the mean number of cycles to maximum operating force over which a sensor can be expected to operate until failure. The mean value is determined statistically from a probability distribution for failures based upon test data. MCTF may vary depending on the specific application in which a sensor is utilized. 2 sensing.honeywell.com