Video Demo


Video Demo


Video Demo


• 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)

• ISO 17025-accredited calibration w/data included

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 60K psi (4,200 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.

• Precision pressure measurement

• Field gauge calibration

• Pressure safety valve (PSV) testing

• Pressure regulator testing

Gauge Pressure[1]
P/NPressure RangeMedia[2]AccuracyBurst Pressure
V15-15-1G0.02 (0.05, 0.1, 0.2)N/A
GP220.16G0.05 (0.1, 0.2)N/A
GP550.35G0.05 (0.1, 0.2)0.1
GP10100.7G0.02 (0.05, 0.1, 0.2)0.1
GP15151G, L[3]0.02 (0.05, 0.1, 0.2)0.1
GP30302G, L[3]0.02 (0.05, 0.1, 0.2)0.1
GP50503.5G, L0.02 (0.05, 0.1, 0.2)0.1
GP1001007G, L0.02 (0.05, 0.1, 0.2)0.1
GP15015010G, L0.02 (0.05, 0.1, 0.2)0.1
GP30030020G, L0.02 (0.05, 0.1, 0.2)0.1
GP50050035G, L0.02 (0.05, 0.1, 0.2)0.1
GP60060040G, L0.02 (0.05, 0.1, 0.2)0.1
GP1K100070G, L0.02 (0.05, 0.1, 0.2)0.1
GP2K2000140G, L0.02 (0.05, 0.1, 0.2)0.1
GP3K3000200G, L0.02 (0.05, 0.1, 0.2)0.1
GP5K5000350G, L0.02 (0.05, 0.1, 0.2)0.1
GP10K10000700G, L0.02 (0.05, 0.1, 0.2)0.1
GP15K150001000G, L0.05 (0.1,0.2)0.1
GP20K200001400G, L0.05 (0.1,0.2)N/A1.5×
GP25K250001600G, L0.1 (0.2)N/A1.5×
GP30K300002000G, L0.1 (0.2)N/A1.5×
GP36K360002500G, L0.1 (0.2)N/A1.5×
GP40K400002800G, L0.1 (0.2)N/A1.35×
GP50K500003500G, L0.1 (0.2)N/A1.2×
GP60K600004200G, L0.1 (0.2)N/A1.1×
[1] Sealed gauge pressure for above 1,000 psi [2] G=Gas, L=Liquid [3] 0.02% FS for gas media only
Barometric Pressure
P/NPressure RangeMediaAccuracyBurst Pressure
BP60 kPa110 kPaG40 Pa
Absolute Pressure
P/NPressure RangeMedia[1]Accuracy(%FS)Burst Pressure
AP550.35G0.1 (0.2)
AP10100.7G0.1 (0.2)
AP15151G0.1 (0.2)
AP30302G0.1 (0.2)
AP50503.5G0.1 (0.2)
AP1001007G, L0.05 (0.1, 0.2)
AP30030020G, L0.05 (0.1, 0.2)
AP50050035G, L0.05 (0.1, 0.2)
AP1K100070G, L0.05 (0.1, 0.2)
AP3K3000200G, L0.05 (0.1, 0.2)
AP5K5000350G, L0.05 (0.1, 0.2)
[1] G=Gas, L=Liquid
Differential Pressure
P/NPressure RangeMediaAccuracy (%FS)[1]Burst PressureStatic Pressure Range
DP1±1±2.5G0.05[2]100×±10 psi
DP2±2±5.0G0.05[2]100×±10 psi
DP5±5±10G0.05[2]50×±10 psi
DP10±10±25G0.05[2]20×±10 psi
DP20±20±50G0.0520×±10 psi
DP30±30±75G0.0520×±10 psi
DP50±50±160G0.05±10 psi
DP150±150±350G0.02 (0.05)50 psi
DP300±300±700G0.02 (0.05)50 psi
[1] FS specification applies to the span of the range. Accuracy includes one year stability. [2] 0.05%FS accuracy (incl 6 months stability). One year accuracy is 0.05%FS calibration accuracy combined with 0.05%FS one year stability.
Compound Pressure
P/NPressure RangeMedia[1]Accuracy (%FS)[1]Burst Pressure
CP2±2±0.16G0.05 (0.1,0.2)N/A
CP5±5±0.35G0.02 (0.05,0.1,0.2)0.1
CP10±10±0.7G0.02 (0.05,0.1,0.2)0.1
CP15±15±1G0.02 (0.05,0.1,0.2)0.1
CP30-15 to 30-1 to 2G0.02 (0.05,0.1,0.2)0.1
CP100﹣15 to 100﹣1 to 7G, L0.02 (0.05,0.1,0.2)0.1
CP300﹣15 to 300﹣1 to 20G, L0.02 (0.05,0.1,0.2)0.1
[1] G=Gas, L=Liquid [2] FS specification applies to the span of the range.
General Specifications
DescriptionDigital Pressure GaugeIntrinsically Safe Digital Pressure Gauge
Intrinsic Safety & European ComplianceCE marked
Ɛx II 1G EX ia IIC T4 Ga
ATEX certified intrinsically safe
Accuracy (For detailed accuracy, please see pressure range table)681(IS)-02 : 0.02% of full span
681(IS)-05 : 0.05% of full span
681(IS)-10 : 0.1% of full span
681(IS)-20 : 0.2% of full span
681(IS)-RD : 0.02% of full span (0% to 20% of Range), 0.1% of reading (20 to 100% of Range), 0.25% of full span (Vaccuum)
Gauge TypesGauge pressure, Compound pressure, Absolute pressure, Differential pressure, Barometric pressure
Fan-shaped Graph ScaleSimilar to analog dials, including pressure swing, % indication with fan-shaped graph scale for visual reference, low/high alarm
DisplayDescription: 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 UnitsPa, kPa, MPa, psi, bar, mbar, kgf/cm2, inH2O @4°C, mmH2O @ 4°C, inHg@0°C, mmHg @0°C
EnviromentalCompensated 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 Port15,000 psi: 1/4NPT male, 1/2NPT male, 1/4BSP male, 1/2BSP male, M20x1.5 male
>15,000 psi: 1/4HP female (Autoclave F-250-C, 9/15" - 18 UNF-2B) or 1/4HP male (Autoclave M-250-C, 9/15" - 18 UNF-2A)
Differential Pressure: 0.236 inch (Ø6 mm) test hose
Other connectsion available upon request
PowerBattery: One 9V alkaline battery (included)
Battery Life (High Power Mode): 320 hours
Battery Life (Low Power Mode): 300 hours (10 readings/s), 500 hours (3 readings/s), or 4000 hours (1 reading / 10s)
Power auto-off: 60 minutes power auto-off. Auto-off may be disabled.
External power: 100/220V external power adapter (optional)
EnclosureCase material: Aluminum Alloy
Wetted parts: 316L SS
Dimension: Ø110mm X 35mm depth X 176mm height (panel mount gauge: Ø140mm X 86mm depth)
Weight: 0.6kg
ComplianceProtection Level: IP67 (available for 681IS GP15-60K)
Vibration: 5g (20-2000 Hz)
Shock Resistance: 100g/11ms
Data Logging (Available with data logging option ADT681-...-DL)Data storage: 21,843 records (each record includes data, time, pressure, and temperature)
Rate: user -selectable from 1 to 99,999 second intervals
CommunicationRS232 (Do not use the RS-232 connector in a hazardous atmosphere)
Warranty1 year


File nameUpload DateSize
Additel 681 series Digital Pressure Gauge Datasheet 2018.3.27 0.7 MB
Additel 681 series Digital Pressure Gauge User Manual 2019.3.21 6.7 MB
Additel Pressure Gauge Selection Guide 2019.5.21 0.3 MB

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