Model 1865 Force/Pressure transducer DESCRIPTION The Model 1865 is a high-performance transducer specifically provide medical personnel with useful diagnostic information designed to address the needs of medical and specialized regarding the condition of the patients circulatory system. OEM applications. Offering laser-trimmed compensation, the These force/pressure transducers can also be used with other Model 1865 may be specified to operate with either a medical dispensing devices, such as syringe pumps, to constant current or voltage supply. improve safety and accuracy. The Model 1865 employs a solid state piezoresistive pressure May be operated in either current or voltage excitation, the transducer mounted in a plastic package. For applications Model 1865s output can be amplified or signal conditioned, where force is applied by a flexible membrane to the sensor, as required. The semiconductor-based sensor offers high such as found in infusion pumps, the Model 1865s precision resolution using its Wheatstone Bridge strain gauge design. height silicone diaphragm provides long life and is a reliable The height of the units patented, poured-in-place silicon replacement for older force or load cell transducers. Utilizing rubber diaphragm is controlled to ensure sensitivity to low a silicon rubber diaphragm, the 1865 is compatible with some pressure. This diaphragm is bonded to a plastic header and liquid media applications. transmits force applied through a special silicone gel to the diaphragm of a silicon peizoresistive die. The back of the die The Model 1865 provides access to important safety features is exposed to atmospheric pressure, which results in a gauge in critical care medical instrumentation, such as occlusion pressure output. pressure or infiltration detection. The pressure data can FEATURES TYPICAL APPLICATIONS Silicon pressure/force interface diaphragm Infusion pumps Force measurement for infusion pump applications Anesthesia monitors Pressure measurement for liquid media Non-corrosive, nonpressurized media-level sensors Medical-grade materials Ventilation systems 8-pin DIP electrical connection Blood pressure equipment Laser trimmed Syringe pumps Choice of voltage or constant current excitation Drug delivery systemsModel 1865 Series ELECTRICAL SPECIFICATIONS PHYSICAL SPECIFICATIONS Ratings Specification Input impedance Pressure over-range protection 3X span or 60 psi, whichever Current excitation 2.0 kOhm min. to 8.0 kOhm max. is least Voltage excitation 8.0 kOhm min. to 40 kOhm max. Media/materials compatibility Output impedance Top side Room atmosphere, directly Current excitation 3.5 kOhm min. to 6.0 kOhm max. applied force, and liquids Voltage excitation 3.5 kOhm min. to 6.0 kOhm max. compatible with dimethyl Input excitation silicon, polyetherimide Current < 2.0 mA (Ultem) Voltage < 15.0 Vdc Bottom side Non-corrosive dry gasses Effect of excitation change Ratiometric and fluids compatible with Response time (10% to 90%) 5 milliseconds silicon, Pyrex, RTV silicone, Insulation resistance 100 MOhm at 50 Vdc and ceramic Output common mode voltage 50 % of input typical Mass 3.0 g with laser-trim board ENVIRONMENTAL CONDITIONS Specification Position effect 0.05 % of zero or span shift for 90 tilt in any direction Vibration effect No change in performance at 10 Gs RMS, 20 Hz to 2,000 Hz Shock 100 Gs for 11 milliseconds Life 1 million cycles 0% to 95%RH, non Humidity Preliminary data* condensing PERFORMANCE SPECIFICATIONS Min. Typ. Max. Unit Temperature Compensated Performance Nonlinearity - 0.10 0.25 % of Span, BFSL Hysteresis - 0.0125 0.015 % of Span, BFSL Repeatability - 0.0125 0.015 % of Span, BFSL Output (laser trimmed normalized) Current excitation 98 100 102 mVdc Voltage Excitation 38 40 42 mVdc Zero pressure -2 0 2 mVdc Temperature Performance Compensated temperature range -1 C to 54 C 30 F to 129 F Operating temperature range -28 C to 54 C -19 F to 129 F Maximum zero error 0.5 % of Span in reference to 27 C 80.6 F Maximum span error 0.5 % of Span in reference to 27 C 80.6 F Thermal hysteresis 0.2 % of Span, compensated temperature range Long-term stability 0.3 % of Span per six months Storage temperature range -28 C to 54 C -19F to 129 F 2 www.honeywell.com/sensing