Pressure / Process Calibration Equipment
Corporate Headquarters
2900 Saturn St #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email:
Rev # 20240605
Pressure ranges to 60,000 psi (4,200 bar)
0.02%, 0.05% FS or 0.1% RD accuracy
Measures gauge or absolute pressure
% pressure indication with fan-shaped graphic
Fully temperature compensated accuracy (-10~50°C)
Bluetooth communication
Communication with Additel's Link Mobile App
Large easy-to-read display
Intrinsically safe version (681AEx)
Data logging (up to 10,000,000 records)
IP67 rated
Digital Pressure Gauges
Additel 681A
Additel’s 681A Series Digital Pressure Gauges are designed to be your favorite tool for a wide range of pressure
measurement and calibration applications. With features such as datalogging and Bluetooth technology included, you
will nd these gauges to be high in value at a reasonable cost. These durable IP67 rated gauges have been built with
outdoor elements in mind and are the perfect t for eld work as well as in the laboratory. If you are working in an
intrinsically sensitive area, look to our Ex-versions of this amazing digital pressure gauge to provide that extra level of
safety in sensitive areas.
The model ADT681A has been built with the nest materials to ensure that it can hold up the elements. Everything
from the stainless steel outer shell to the innermost sensor design have been optimized to ensure that this gauge will
keep you informed with on-demand and logged pressure readings for years to come. The IP67 rating ensures that
dusty and wet environments won’t hamper this gauges ability to perform while the shock and vibration resistance
(5g vibration 10g shock) coupled with the corrosion resistant wetted parts help to protect the inner workings of these
durable Additel gauges.
Easy to use:
Technicians often have tight schedules and heavy workloads, which leaves little extra time for correcting mistakes or
doing rework. The ADT681A solves this problem with carefully designed button functions and menus that are smooth
and easy to use which saves on valuable time. The display is clear in bright sunlight, and the backlight can be turned
on with a one-button press for use in low light situations. The pressure value can be displayed in large fonts and can
be read from a few meters away, making this gauge the perfect device for no-nonsense measurement, calibration and
verication work.
Easy to maintain:
The ADT681A is designed with membrane buttons, making them easy to clean and maintain over time, which can
simply be wiped clean for quick and simple cleaning. Coupled with the extra-long battery life of these easy-to-use
gauges, you will nd that maintenance is minimal and infrequent.
Corporate Headquarters
2900 Saturn St #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email:
Pressure / Process Calibration Equipment
Rev # 20240605
Model ADT681A ADT681AEx
Digital Pressure Gauge Intrinsically Safe Digital Pressure Gauge
Intrinsic Safety
European Compliance
CE marked
CE marked
EU: II 1G EX ia IIC T4 Ga T4 at -20~50°C
North America: CLASS I, Division 1, Groups A, B, C and D, T4
CLASS I,Zone 0,AEx ia IIC T4 Ga
T4 at -20~50°C
International:EX ia IIC T4 Ga T4 at -20~50°C
(For detailed accuracy, please
see pressure range table)
681A(Ex)-02: 0.02% of full span
681A(Ex)-05: 0.05% of full span
681A(Ex)-RD: 0% to 20% of range: ± (0.02% of full span)
20% to 110% of range: ± (0.1% of reading)
vacuum: ± (0.25% of FS), FS=-14.5psi
Built-in barometer: ± 55 Pa
Gauge Types
Gauge pressure, compound pressure, absolute pressure (calculated by gauge pressure and baromatric pressure),
differential pressure and barometric pressure
Fan-shaped section
Atmospheric pressure, ambient temperature, peak-peak values (max, min), TARE, leak test, pressure percentage
display, time display, data logging status
Wide viewing angle FSTN segment code LCD, three partition design
White backlight, backlight time: ON, 15 seconds, 30 seconds, 45 seconds, 60 seconds, the default is 15 seconds
5~6 digit display can be switched, character height 14.8mm(0.58"), main display + unit display + fan-shaped section
Pressure Units
Pa, kPa, MPa, psi, mbar, bar, kgf/cm2, %, mmH2O(4°C), mmHg(0°C), InH2O(4°C), InHg(0°C)
6 engineering water column units: inH2O(20°C), inH2O(60°F), mmH2O(20°C), mmH2O(15°C), ftH2O(60°F), ftH2O(4°C)
1 custom unit: identied by the USER code, and the conversion coefcient can be set through Additel -Link
Compensated Temperature: 14°F to 122°F (-10°C to 50°C)
Operating Temperature: -4°F to 122°F (-20°C to 50°C)
Storage Temperature: -40°F to 167°F (-40°C to 75°C)
Humidity: 5%RH~95%RH, no condensing
Pressure Port
≤15,000 psi: 1/4NPT male, 1/2NPT male, 1/4BSP male, 1/2BSP male, M20×1.5 male
>15,000 psi: 1/4HP female or 1/4HP male
*1/4HP female: Autoclave F-250-C, 9/16" - 18 UNF-2B
*1/4HP male: Autoclave M-250-C, 9/16" - 18 UNF-2A
Differential Pressure: barb tting
Other connections available per request
Battery: 3 AA alkaline batteries
Battery life:
1. Super stable mode
: 4000 hours (3 reading/s, default), 1000 hours (10 reading/s)
2. Low power mode
: 5000 hours (2 reading/s), 9000 hours (1 reading/s), 18000 hours (1 reading/10s)
Power auto-off: 120, 90, 60, 45, 30, 15 minute auto-off options or never
External power: power supply through USB (optional)
Case material: 304 SS; Front panel material: anti-static PET; Rubber boot material (optional): anti-static TPU
Wetted parts: 316L SS
Dimension: Ø4.65" x 1.65" depth x 7" height (Ø118 mm x 42 mm depth x 178 mm height)
Weight: 1.5 lbs (0.68 kg)
Protection Level: IP67(against 1 meter water immersion for 30 mins)
Vibration: 5 g; Shock Resistance: 10 g
1 meter drop test (without rubber boot)
Data Logging (Optional)
Data storage: 10,000,000 records (time and pressure) or 5,000,000 records (time, pressure and temperature)
Rate: user-selectable from 0.1 to 99,999 second intervals
Bluetooth (BLE4.2), USB-C, RS232 *(Do not use the USB-C or RS-232 connector in a hazardous area)
ISO 17025 Accredited Calibration Certicate with data
1 year
[1] The pressure sensor has been powered continuously when the gauge is on, to improve the measurement resolution and reduce the impact of ambient humidity.
[2] The pressure sensor will be powered off after each sampling, to improve the continuous working hours.
Pressure / Process Calibration Equipment
Corporate Headquarters
2900 Saturn St #B
Brea, CA 92821, USA
Salt Lake City Office
1364 West State Rd. Suite 101
Pleasant Grove, UT 84062, USA
Phone: 714-998-6899 Email:
Rev # 20240605
Gauge Pressure
Pressure Range
Annual Accuracy
(psi) (bar) %FS %RD
-15 -1.0 G 0.02 N/A
-15 -1.0 G, L 0.05 N/A
GP2 2 0.16 G 0.05 N/A
GP5 5 0.35 G, L 0.05 0.1
GP10 10 0.7 G, L 0.02,0.05 0.1
GP15 15 1.0 G, L 0.02,0.05 0.1
GP30 30 2.0 G, L 0.02,0.05 0.1
GP50 50 3.5 G, L 0.02,0.05 0.1
GP100 100 7.0 G, L 0.02,0.05 0.1
GP150 150 10 G, L 0.02,0.05 0.1
GP300 300 20 G, L 0.02,0.05 0.1
GP500 500 35 G, L 0.02,0.05 0.1
GP600 600 40 G, L 0.02,0.05 0.1
GP1K 1,000 70 G, L 0.02,0.05 0.1
GP1.5K 1,500 100 G, L 0.02,0.05 0.1
GP2K 2,000 140 G, L 0.02,0.05 0.1
GP3K 3,000 200 G, L 0.02,0.05 0.1
GP5K 5,000 350 G, L 0.02,0.05 0.1
GP10K 10,000 700 G, L 0.02,0.05 0.1 1.5×
GP15K 15,000 1,000 G, L 0.05 (0.1) 0.1 1.5×
GP20K 20,000 1,400 G, L 0.05 (0.1) N/A 1.5×
GP25K 25,000 1,600 G, L 0.05 (0.1) N/A 1.5×
GP30K 30,000 2,000 G, L 0.05 (0.1) N/A 1.5×
GP36K 36,000 2,500 G, L 0.05 (0.1) N/A 1.5×
GP40K 40,000 2,800 G, L 0.05 (0.1) N/A 1.35×
GP50K 50,000 3,500 G, L 0.1 (0.2) N/A 1.2×
GP60K 60,000 4,200 G, L 0.1 (0.2) N/A 1.1×
[1] Sealed gauge pressure for above 1,000 psi
[2] Vacuum range is (-15~0) psi
[3] G=Gas, L=Liquid
[4] %RD accuracy: 0% to 20% of range: ± (0.02% of full span), 20% to 110% of range: ± (0.1% of reading)
vacuum: ± (0.25% of FS), FS=-14.5psi
Barometric Pressure
Pressure Range
Annual Accuracy
Low High
BP 60 kPa 110 kPa G ±55Pa
BPH 60 kPa 110 kPa G ±22Pa
[1] G=Gas