Additel 227 Multifunction Process Calibrator
Key specifications
| Function | ADT227 capability |
|---|---|
| DC voltage source | ±150 mV, ±1.5 V, ±15 V |
| DC current source | 0–25 mA |
| Resistance source | 0–400 Ω and 0–4 kΩ |
| Frequency source | 0.01–50,000 Hz |
| Pulse source | 0–9,999,999 counts |
| Loop power | 24 V, up to 30 mA |
| Voltage measurement | ±300 mV, ±30 V; high-voltage measurement up to ±300 V DC/AC |
| Current measurement | ±30 mA DC |
| Resistance measurement | 0–4 kΩ |
| Frequency measurement | 0.01–50,000 Hz |
| Pressure | Via ADT161 digital pressure modules, from −15 psi to 60,000 psi (−1 to 4,200 bar) |
| Pressure-module ports | Dual channel |
| Pressure accuracy | Up to 0.02% FS depending on module; high-static differential measurement up to 0.002% FS |
| Temperature | Thermocouple and RTD measurement/source |
| Display | Color touchscreen, smartphone-style interface |
| Communications | USB-C and Bluetooth |
| Ingress protection | IP67 |
| Battery | Rechargeable Li-ion, typically up to 12 hours |
| Calibration | ISO 17025-accredited calibration with data included |
The electrical source accuracy can reach 0.005% of reading + 0.005% FS, while the latest published specifications give more detailed accuracy figures for individual functions.
Important variants
- ADT227 — standard documenting multifunction process calibrator.
- ADT227-HART — adds a built-in full HART communicator.
- ADT227Ex — intrinsically safe version for hazardous-area applications.
- ADT227Ex-HART — combines intrinsic safety with HART functionality.
- ADT227P — panel-mount version is also offered.
Pressure capability
The ADT227 itself uses external ADT161/ADT161Ex intelligent digital pressure modules rather than having a single fixed internal pressure range. Available modules cover approximately −15 psi to 60,000 psi (−1 to 4,200 bar), allowing the calibrator to be configured for different pressure applications.
Typical applications
The ADT227 is intended for calibration and verification of:
- Pressure transmitters and switches
- 4–20 mA process loops
- Temperature transmitters and sensors
- RTDs and thermocouples
- Voltage/current instruments
- Frequency and pulse instruments
- HART-enabled transmitters — with the HART variant
- Differential-pressure transmitters
- Process instrumentation in hazardous areas — with the Ex variant
Its data logging/documentation, built-in pressure/temperature converters, wiring diagrams, diagnostic functions, Bluetooth/USB connectivity, and touchscreen interface are particularly useful for field calibration workflows.
Bottom line: the ADT227 is essentially a portable documenting calibrator combining a precision electrical calibrator, temperature calibrator, pressure-module interface, and process-loop tester. The ADT227-HART is the relevant configuration when HART communication is part of the job.
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