Product Overview
The FMA Series sensors are designed for high-end coffee and espresso machines, providing precise ingredient measurement and dispensing information. These capabilities are crucial for ensuring the quality of the final product.
Applications in Coffee and Espresso Machines:
- Measures weight of coffee grounds to ensure correct coffee strength.
- Measures weight of beans/fresh grounds container to detect when it is close to empty.
- Measures weight of used grounds to detect when container needs to be emptied.
- Provides real-time measurement of liquid as pumped into cup to prevent overflows/spills.
- Detects cup/carafe presence before dispensing liquid, ensuring liquid goes into the cup.
- Measures the amount of liquid dispensed into the cup to alert the customer if enough liquid is available.
- Measures weight of water tank to detect when it is close to empty and needs refilling.
- Industry-standard digital output simplifies system design, enabling faster design cycles.
[Illustration: A coffee machine with numbered callouts indicating sensor application points for weighing coffee grounds, monitoring used grounds, measuring liquid dispensing, and checking water tank levels.]
Technical Description
The FMA Series sensors utilize piezoresistive technology to provide a digital output for force readings across a specified full-scale force span and temperature range. They are fully calibrated and temperature compensated for sensor offset, sensitivity, temperature effects, and nonlinearity via an on-board Application Specific Integrated Circuit (ASIC).
The direct mechanical coupling design allows for easier sensor interfacing (using tubing, membrane, or a plunger), ensuring repeatable performance and a more robust mechanical connection to the application. These sensors deliver a stable output directly proportional to the force applied to the mechanically-coupled sphere.
The digital I²C interface supports multiple addresses on the same bus, facilitating the use of multiple sensors and reducing system complexity. An optional internal diagnostics function is available for fault detection.
[Illustration: A small electronic component labeled "FMA Series", described as "Sensor optimized to be as small as possible while still allowing for mechanical coupling."]
Product Nomenclature
The product nomenclature defines the sensor's configuration:
| Component | Description | Options |
|---|---|---|
| FM | MicroForce Sensors | FMA |
| A | Type | Compensated/amplified |
| M | Coupling | Mechanical |
| S | Contact Element | Sphere |
| D | Option Code | N: No diagnostics D: Sensor short and open diagnostics |
| XX | Option Code 1 | Future placeholder |
| 025 | Force Range | 005: 5 (Newtons) 015: 15 (Newtons) 025: 25 (Newtons) |
| W | Force Unit | Newton (N) |
| C | Force Output Type | Compression |
| S | Transfer Function | S: SPI 2: I²C, Address 0x28 3: I²C, Address 0x38 4: I²C, Address 0x48 5: I²C, Address 0x58 6: I²C, Address 0x68 7: I²C, Address 0x78 |
| C3 | Supply Voltage | 3: 3.3 V ±10% 5: 5.0 V ±5% |
Note: Custom configurations are available upon request. Please contact Honeywell Sales.
FMA Series Specifications
| Characteristic | Parameter |
|---|---|
| Description | compensated/amplified |
| Force range | 5 N, 15 N, 25 N |
| Output | SPI, I²C |
| Supply voltage | 3.3 V, 5.0 V |
| Supply current, typ. | 2.8 mA (3.3 V), 3.9 mA (5.0 V) |
| Operating temperature range | -40°C to 85°C [-40°F to 185°F] |
| Compensated temperature range | 5°C to 50°C [41°F to 122°F] |
| Accuracy, typ. | ±2% FSS BFSL |
| Total Error Band, max. | ±8% FSS BFSL |
| Output resolution | 12 bits |
| Long term stability | ±1.6 FSS |
| Humidity | 0% to 95% RH, non-condensing |
| Shock | MIL-STD-202, Method 213, Condition A (50 G) |
| Vibration | MIL-STD-202, Method 214, Condition 1F (20.71 Gms) |
| Life | 1 million full scale force cycles minimum |
| Package size | 5 mm x 5 mm [0.20 in x 0.20 in] |
Important Information
WARNING: PERSONAL INJURY
DO NOT USE these products as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Failure to comply with these instructions could result in death or serious injury.
WARNING: MISUSE OF DOCUMENTATION
The information presented in this document is for reference only. Do not use this document as a product installation guide. Complete installation, operation, and maintenance information is provided in the instructions supplied with each product. Failure to comply with these instructions could result in death or serious injury.
Contact Information
Honeywell Advanced Sensing Technologies
830 East Arapaho Road
Richardson, TX 75081
sps.honeywell.com/ast
Document Number: 008337-2-EN | Revision: 05/21
©2021 Honeywell International Inc.
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