Autrol APT 3700N
Smart Pressure Transmitter
The Autrol APT 3700N is a microprocessor-based smart pressure transmitter designed for pressure, differential pressure, flow, and level measurement. It features automatic temperature compensation, flexible sensor input, EEPROM data storage, and HART digital communication.
With nuclear and seismic qualifications (IEEE Std 344, IEEE Std 323, NRC Regulatory Guide 1.180), the APT 3700N is engineered for safety-critical applications in power plants, oil & gas, and process industries.
- Sensor input options: DP, GP, AP, Vacuum
- Accuracy: ±0.075% of calibrated span
- Stability: ±0.25% URL per 24 months
- High rangeability: 100:1
- Long-term stability: ±0.125% URL for 36 months
- Automatic ambient temperature compensation
- Continuous self-diagnostics (sensor, memory, A/D, power)
- EEPROM write protection
- Fail-mode process function
- Digital communication: HART protocol
- Explosion-proof approval (KOSHA)
Model
APT 3700N
Output Protocol
4–20 mA + HART 5 digital
Power / Load
24 VDC, 250–550 Ω loop resistance
Failure Mode
Low ≤ 3.78 mA, High ≥ 21.1 mA
Trim Functions
Zero, DAC, Full
External Buttons
Zero & Span
Process Temperature Limit
-40 to +120 °C (-104 to +248 °F)
Rangeability
100:1
- Explosion Proof: KOSHA Ex d
- Nuclear Qualification: IEEE Std 344-1987/2004, IEEE Std 323-1983/2003, NRC Regulatory Guide 1.180 (Rev.1)
- Safety: Continuous self-diagnostics and EEPROM protection
- Nuclear & Power Plants – Qualified for safety-critical measurement
- Oil & Gas – Pressure and flow monitoring under harsh conditions
- Chemical & Refining – High-pressure and corrosive service
- Marine & Offshore – Certified for vessel and offshore applications
