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Additel 685

Digital Pressure Gauge Series

The Additel 685 Digital Pressure Gauge Series provides operators with complex pressure testing capabilities and precise measuring applications. These models have 0.02%, 0.05% FS, or 0.1% RD accuracy, a touchscreen display, and more. With pressure ranges up to 60,000 psi (4,200 bar), this series is advanced and user-friendly.

Product Info Product Options Related Products

Pressure Measurement Range	Barometric: 60–110 kPa; Gauge: −15 psi - 60,000 psi (−1 bar - 4,200 bar); Compound: −15 psi - 1,000 psi; Differential: ±1 - ±300 inH₂O
Accuracy	±0.02% FS or ±0.05% FS; RD option: ±0.02% FS (0–20% span), ±0.1% of reading (20–110% span)
Long‑Term Stability	Included in stated accuracy; 1‑year stability per selected range
Pressure Media	Gas and liquid (range‑dependent)
Overpressure / Burst Rating	1.1× to 3× full scale depending on pressure range
Barometric Reference Accuracy	±55 Pa
Measurement Update Rate	0.05 - 10 Hz (1 reading every 20 s - 10 readings per s)
Display Resolution	5½ digits
Environmental Operating Limits	−10 °C - 50 °C operating; −30 °C - 70 °C storage; 0–95% RH non‑condensing
Pressure Connections	≤15,000 psi: 1/4″ or 1/2″ NPT, BSP, or M20×1.5; ≥15,000 psi: 1/4″ HP Autoclave; differential: barb
Power	3× AA alkaline batteries; ~1500 h typical
Communications	USB‑C and Bluetooth standard; optional RS‑232, RS‑485, or 4–20 mA
Data Logging Capacity	10,000,000 records; 0.1–9999.9 s logging interval
Enclosure & Protection	304 SS case; 316 SS wetted parts; IP67; vibration 5 g (10–500 Hz); shock 8 g / 11 ms
Certifications	CE, UKCA