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 # 20240124
Looking for the most advanced, best performing and modern digital pressure gauge on the market? Congratulations,
you’ve just found it! Additel’s ADT685 digital pressure gauges are in a class of their own with an amazingly easy
to use and read touchscreen display. The all new modern menu structure and control interface bring a new and
refreshing experience to gauge work. This completely new way of interfacing with our gauges makes the ADT685
gauges a real pleasure to use. With microprocessor technology, state-of-the-art silicon pressure sensors and
plenty of onboard storage capacity, these attractive and fully temperature compensated gauges will provide the
performance, durability and reliability you’ve come to expect from genuine Additel products. To provide support for
intrinsically safe needs, the ADT685Ex comes ready to provide pressure measurements and recordings in the most
demanding of environments. Each Additel 685 is also IP67 rated to protect your investment in dusty and/or wet
Pressure ranges up to 60,000 psi (4,200 bar)
0.02%, 0.05%FS or 0.1%RD accuracy
Fully temperature compensated accuracy
Every model measures Gauge or Absolute Pressure
Built-in Barometer
Touchscreen display
Intrinsically safe version 685Ex (optional)
Bluetooth and USB communications
Data logging (optional)
IP67 rated
Communicates with Additel's Link Mobile App
ISO 17025-accredited calibration w/data included
Digital Pressure Gauges
Additel 685
Datalogging Option:
A Modern User Experience:
Additel has gone above and beyond to provide our customers with the best possible
experience when using these new and revolutionary gauge. The 3.4 inch touchscreen display
comes with a protective replaceable tempered glass screen and is a refreshing update to the
traditional push button or blister pad interface. With an easy to navigate menu structure and
fast touchscreen response, you will nd these ADT685 gauges simple yet powerful to use. The
easy to read display isn’t just fun to use, but it’s built rugged to handle the demands of a busy
technician in the eld or the laboratory.
The Additel 685 Digital Pressure Gauges contain a built-in barometer sensor which
allows for the pressure reading to display in gauge pressure or absolute pressure with a
simple menu selection. The built-in barometer is calibrated and certied to an accuracy
of 55 Pa. With this unique feature, the ADT685 can be a solution for three common
applications: gauge pressure measurement, absolute pressure measurement, and
barometric or atmosphere pressure measurement. Having an Additel as your gauge will
always give you the ability to do more with one instrument!
We've added the option to do stand-alone data logging with the ADT685. Now you can record more than 10M
records internal to the 685 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. Additel's 685 digital pressure gauges are unmatched in performance and reliability. You get nothing
but the best when you buy Additel Products!
Every model measures Gauge or Absolute Pressure:
Additel 685
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 # 20240124
Model ADT685 ADT685Ex
Intrinsic Safety
European Compliance
CE marked, CSA marked
ATEX certied intrinsically safe
II 1G EX ia IIC T4 Ga
(For detailed accuracy, please
see pressure range table)
685(Ex)-02: 0.02% of full span
685(Ex)-05: 0.05% of full span
685(Ex)-RD: 0% to 20% of range: 0.02% of full span
20% to 110% of range: 0.1% of reading
Built-in barometer:
55 Pa
Gauge Types
Gauge pressure, compound pressure, absolute pressure, differential pressure and
barometric pressure
Touch screen (3.4'' FSTN segment capacitive) - 5 1/2 full digits
Screen protector: tempered glass lm (replaceable)
Display rate: 3 readings per second (default setting).
Adjustable from 10 readings per second to 1 reading every 20 seconds
Pressure Units
Pa, kPa, MPa, psi, bar, mbar, kgf/cm2, inH2O@4°C, mmH2O@4°C, inHg@4°C,
mmHg@4°C and 3 customizable units
Compensated Temp.: 14°F to 122°F (-10°C to 50°C)
Operating Temp.: 14°F to 122°F (-10°C to 50°C)
Storage Temp: -4°F to 158°F (-30°C to 70°C)
Humidity: 0 - 95%, Non-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: three AA alkaline batteries (included)
Battery life: 1500 hours typical
Power auto-off: user selectable
External power: 110/220 V adapter (5 VDC) (optional, excl ADT685Ex)
Case material: 304 SS
Wetted parts: 316 SS
size: 4.65" × 1.77" × 7.01" (118mm × 42mm × 178mm)
Weight: 1.50 (0.68 kg)
Protection Level: IP67
Vibration: 5 g (10-500 Hz)
Shock Resistance: 8 g/11 ms
Data Logging
(Available on data
logging option
Data storage: 10,000,000 records
Rate: user-selectable from 0.1 to 9999.9 second intervals
USB Type-C and Bluetooth included
RS-232 or RS-485
4 - 20 mA Output
3.2 μA
1 year
[1] Wetted parts material types may vary by pressure range. Please refer to manual or contact Additel for more information
[2] 4-20mA output and RS-485 not available in ADT685Ex models
[3] Available units are dependent on the overall pressure range