Absolute pressure gauge ADT685EX

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Overview
The Additel ADT685EX is an intrinsically safe digital pressure gauge certified ATEX II 1G EX ia IIC T4 Ga for pressure measurement in hazardous/explosive atmospheres. Fully temperature-compensated, it features a 3.4" touchscreen, Bluetooth and USB communications, and IP67 protection.

Key features

• Pressure ranges up to 60,000 psi (4,200 bar)
• Available accuracies: 0.02% FS, 0.05% FS or 0.1% of reading depending on model
• Fully temperature-compensated accuracy
• Integrated barometer enabling relative, compound or absolute measurements
• 3.4" touchscreen with replaceable tempered glass protective film
• Bluetooth and USB (USB Type-C) communications; RS-232 available
• Onboard data logging (optional): up to 10,000,000 records
• IP67 rating with resistance to vibration and shock
• Sealing and robustness for demanding environments

Detailed description
The Additel ADT685 series provides a modern 3.4" touchscreen interface with simplified menus and fast response. Microprocessor technology and advanced silicon pressure sensors deliver high performance, durability and reliability. The ADT685EX is the intrinsically safe ATEX version designed for measurement and data logging in hazardous areas.

User features

• 5 1/2-digit (FSTN) display with adjustable update rate (default 3 readings/s; adjustable up to 10 readings/s or 1 reading every 20 s)
• Replaceable tempered glass screen protector
• Multiple pressure units: Pa, kPa, MPa, psi, bar, mbar, kgf/cm2, inH2O, mmH2O, inHg, mmHg and 3 user-defined units
• Communication with Additel Link mobile app
• Standalone data logging of date, time, pressure and temperature with download via Additel / Land or Additel / Log II software

ATEX classification
Classified ATEX II 1G EX ia IIC T4 Ga. Code explanation: II = surface equipment, 1G = Zone 0 (continuous hazard), EX ia = intrinsic safety, IIC = gas group (most severe), T4 = maximum surface temperature 135°C, Ga = equipment protection level for Zone 0.

Standard delivery

• Rubber boot
• Alkaline AAA batteries (3 pcs)
• USB Type-C cable
• Carrying strap
• Ex RS-232 adapter (for EX RS-232 models only)
• Silicone tubing (2 x 1 m for DP models)
• Manual
• ISO 17025 accredited calibration certificate

Options and accessories

• Carrying case (ref. 9903)
• External power adapter 110/220 V (DC 5V) (ref. 9810)
• Additel / Log II data logging and graphical software (ref. 9502)
• Additel / Acal automated calibration software (ref. 9530 versions)
• USB-to-RS232 adapter and extension cables (9050, 9050-EXT)

Note on ranges and tables
The product supports relative, absolute, differential and compound measurements with numerous standard ranges (see range table), from very low values up to 60,000 psi (4,200 bar). Specific accuracies and overpressure ratings are detailed per range and measurement type (relative, barometric, absolute, differential, compound).

Technical specifications

• Model: ADT685EX
• Description: Intrinsically safe digital pressure gauge
• Marking/Compliance: CE marking, ATEX certified II 1G EX ia IIC T4 Ga
• Pressure ranges: up to 60,000 psi (4,200 bar) (multiple detailed ranges available)
• Accuracy: variants -02 = 0.02% FS; -05 = 0.05% FS; -RD = combination % span / % reading (e.g. 0–20% span: 0.02% span; 20–110%: 0.1% reading)
• Barometric accuracy: 50 Pa (integrated barometer)
• Measurement types: gauge, compound, absolute, differential, barometric
• Display: 3.4" capacitive touchscreen (FSTN) 5 1/2 digits; replaceable tempered glass protector
• Update rate: default 3 readings/s (adjustable 10/s to 1/20 s)
• Units: Pa, kPa, MPa, psi, bar, mbar, kgf/cm2, inH2O, mmH2O, inHg, mmHg + 3 custom units
• Temperature compensated: -10 °C to 50 °C
• Operating temperature: -10 °C to 50 °C
• Storage temperature: -20 °C to 70 °C
• Humidity: 0–95% non-condensing
• Pressure ports: ≤15,000 psi: 1/4 NPT male, 1/2 NPT male, 1/4 BSP male, 1/2 BSP male, M20×1.5 male; >15,000 psi: 1/4 HP female or male (Autoclave F-250-C / M-250-C, 9/16-18 UNF)
• Differential pressure: barbed fitting; other fittings on request
• Power: 3 alkaline AA batteries (included) or external adapter 110/220 V (5 VDC) optional
• Battery life: ~1500 hours
• Auto power-off: selectable
• Housing: 304 stainless steel
• Wetted parts: 316 SS (may vary by range)
• Dimensions: 118 mm (L) x 42 mm (W) x 178 mm (H)
• Weight: 0.68 kg (1.50 lb)
• Ingress protection: IP67
• Vibration: 5 g (10–500 Hz)
• Shock resistance: 8 g / 11 ms
• Data logging: storage up to 10,000,000 records (optional); selectable interval 1 to 99,999 s
• Communications: USB Type-C, Bluetooth included; RS-232
• Warranty: 1 year