Additel 681 Digital Pressure Gauges

Additel 681 Digital Pressure Gauges

  • Description
  • Features
  • Applications
  • Specification


With advanced microprocessor technology and state-of-the-art silicon pressure sensors, the 681 series digital pressure gauges provide an accurate, reliable, and economic solution for a wide range of pressure applications. They are loaded with functionality and remarkably easy to use. To reach the best performance, every silicon pressure sensor in our gauges is specially aged, tested and screened before assembly. At Additel, fully temperature compensated accuracy means every sensor is pressure tested at several environmental temperatures from -10°C to 50°C. With this test data individual coefficients are generated and stored in the gauge characterizing its performance over the full temperature compensated range. And now the ADT681IS comes with an IP67 rating meaning it is dust resistant and water proof, submerible in 1 meter of water.

Designed to fit your need

Additel pressure gauges give you the widest variety of sensor choices on the market. Whether you require low inches of water measurement or very high pressure measurement, we have a gauge that will meet your need. We offer sensors which are ±1 inH2O (±2.5 mbar) to 40K psi (2,800 bar) and everything in between.

Do your applications require you to measure both positive and vacuum pressure? Our compound gauges do not compromise accuracy and provide you with the same high accuracy specification on both positive and vacuum pressures. We offer a wide variety up to 300 psi (20 bar). If you need a higher range, just contact us and we can likely customize one to meet your need. We also offer absolute pressure sensors to 5K psi (350 bar) and a full range of differential pressure sensors from ±1 inH2O (±2.5 mbar) to ±300 inH2O (±700 mbar). Are you looking for a pressure gauge to use in hazardous areas? Our certified (ATEX, CSA US & IECEx) intrinsically safe models (681IS) are designed for pressure measurement in hazardous areas.

If you need to panel mount our sensors, we offer the option (see ordering information) for a back-mounted pressure port and gauge housing designed to fit in a panel. And most recently, we’ve added the option to do stand-alone data logging with the 681. Now you can record more than 21,000 records internal to the 681 series. Each record includes date, time, pressure and temperature readings. Download the logged data with our free Additel/Land software or you can purchase our Additel/Log II for real-time logging and data analysis. The 681 series digital pressure gauges are unmatched in performance and reliability. Best of all, they are very affordable.

  • Pressure ranges to 60,000 psi (4,200bar)
  • 0.02%, 0.05%, 0.1% or 0.2% FS or 0.1% RD accuracy
  • % pressure indication with fan-shaped graph scale for visual reference
  • Fully temperature compensated accuracy
  • Panel mount gauges are available (optional)
  • Intrinsically safe version 681IS (optional)
  • Data logging (optional)
  • IP67 rated (681IS)
  • Precision pressure measurement
  • Field gauge calibration
  • Pressure safety valve (PSV) testing
  • Pressure regulator testing

• Model

ADT681: Regular gauge
ADT681IS: ATEX, CSA US & IECEx certified intrinsically safe

• Accuracy
681(IS)-02: 0.02% of full scale
681(IS)-05: 0.05% of full scale
681(IS)-10: 0.1% of full scale
681(IS)-20: 0.2% of full scale
681(IS)-RD: 0% to 20% of Range: 0.02% of full scale;
20% to 110% of Range: 0.1% of reading;
Vacuum: 0.25% of full scale[1][2]
[1] FS= - 14.5 psi
[2] Applicable ADT681-RD-CPX
(For detailed accuracy, please see pressure range table)

• Gauge Types
Gauge pressure
Compound pressure
Absolute pressure
Differential pressure
Barometric pressure

• Fan-shaped Graph Scale
Similar to analog dials, including pressure swing,
% indication with fan-shaped graph scale for visual reference, low/high alarm.

• Display
Description: 5 full digit FSTN LCD
Display rate: 3 readings per second (Default setting).
Adjustable from 10 readings per second to 1 reading every ten seconds
Numeral display height: 16.5mm (0.65")

• Pressure Units
Pa, kPa, MPa, psi, bar, mbar, kgf/cm2, inH2O 4°C mmH2O 4°C, inHg 0°C, mmHg 0°C

• Environmental
Compensated Temperature: 14°F to 122°F (-10°C to 50°C)
Operating Temperature*: 14°F to 122°F(-10°C to 50°C)
Storage Temperature: -4°F to 158°F (-20°C to 70°C)
Humidity: <95%

• Pressure Port
1/4NPT male, 1/4BSP male, M20×1.5 male (≤15,000 PSI)
1/4HP female or 1/4HP male(≥15,000 PSI)
*1/4HP female: Autoclave F-250-C, 9/16" - 18 UNF-2B
*1/4HP male: Autoclave M-250-C, 9/16" - 18 UNF-2A
0.236 inch (Ø6 mm) test hose (for differential pressure)
Other connections available per request

• Power
Battery: One 9V alkaline battery (included)
Battery life:1. High power mode: 320 hours
2. Low power mode: 300 hours (10 readings/s), 600 hours (3 reading/s), or 4000 hours (1 reading/10s)
Power auto-off: 60 minutes power auto-off. Auto-off may be disable
External power: 110/220V external power adapter (optional)
*(Do not use the external power adapter in a hazardous atmosphere)

• Enclosure
Case material: Aluminum alloy
Wetted parts: 316L SS
Ø110mm X 35mm depth X 176mm height
(panel mount gauge: Ø140mm X 86mm depth)
Weight: 0.6kg

• Compliance
Protection Level: IP67(available for 681IS GP15-40K)
Vibration: 5g (20-2000 Hz)
Shock Resistance: 100g/11ms

• Data Logging
Data storage: 21,843 records (each record includes date, time, pressure and temperature)
Rate: user-selectable from 1 to 99,999 second intervals

• Intrinsic Safety and European Compliance
CE marked
ATEX, CSA US & IECEx certified intrinsically safe (ADT681IS)

• Communication:
RS232 *(Do not use the RS-232 connector in a hazardous atmosphere)