Brand: Additel

Additel ADT681A Wireless Digital Pressure Gauge, Up to 0.01% FS

Name: Additel ADT681A Digital Pressure Gauge | Seven Star LLC
Brand: Additel
SKU: ADT681A

Description

A reference-grade digital gauge with a phone link and a 10-million-point logger

The Additel ADT681A is a digital pressure gauge built for people who need more than a replacement for a dial gauge. It reaches 0.01% of full span on gauge and compound ranges, offers a 0.1% of reading mode for wide-range work and logs up to 10,000,000 readings. A wide-angle display shows the main value in large digits with a fan-shaped graphic that indicates percent of range, so a reading can be taken from a few metres away.

Bluetooth BLE 4.2 connects the gauge to the Additel Link mobile app, and USB-C and RS232 ports are provided for wired use. The stainless steel shell and fully welded sensor are rated IP67 (1 metre immersion for 30 minutes), so it handles wet work as well as laboratory verification.

Features from the datasheet

Ranges from -14.5 psi vacuum up to 60,000 psi (4,200 bar) in gauge, compound and sealed gauge forms.
Absolute pressure calculated from gauge pressure and the optional built-in barometer (BP is +/-55 Pa, BPH +/-22 Pa).
Differential ranges from +/-1 inH2O to +/-300 inH2O with barb fittings and static pressure limits listed per range.
Multifunction display: peak values, TARE, leak test, percentage, time and logging status.
Full temperature-compensated accuracy from -10 to 50 C.

Technical specification

Parameter	Specification
Models	ADT681A and intrinsically safe ADT681AEx
Accuracy (code)	01 = 0.01% FS, 02 = 0.02% FS, 05 = 0.05% FS, 10 = 0.1% FS, 20 = 0.2% FS, RD = 0.1% of reading (20 to 110% of range)
Gauge range examples	GP5 (5 psi) up to GP15K (15,000 psi) at 0.01 to 0.05% FS; GP20K to GP40K at 0.05% (0.1%); GP50K and GP60K at 0.1% (0.2%)
Burst pressure	3x to 5,000 psi; 1.5x at 10K to 15K; down to 1.1x at 60,000 psi
Differential ranges	DP1 to DP300 (+/-2.5 to +/-700 mbar), 0.02 to 0.05% FS, static pressure limits +/-250 to +/-7,000 mbar
Display	FSTN segment LCD, white backlight, 5 or 6 digits, character height 14.8 mm (0.58 in)
Display rate	3 readings per second default; 10 per second to 1 per 10 seconds
Units	Pa, kPa, MPa, psi, mbar, bar, kgf/cm2, %, mmH2O, mmHg, inH2O, inHg, six engineering water columns and one custom unit
Pressure ports	1/4 NPT, 1/2 NPT, 1/4 BSP, 1/2 BSP, M20 x 1.5 male (up to 15,000 psi); 1/4 HP Autoclave F-250-C or M-250-C above 15,000 psi
Materials	Case 304 stainless steel, wetted parts 316L, optional anti-static TPU boot
Power and battery life	3 AA alkaline; 4000 h (3 reads/s), up to 18000 h (1 read per 10 s) in low-power mode; USB power optional
Temperature	Compensated -10 to 50 C; operating -20 to 50 C; storage -40 to 75 C; humidity 5 to 95% RH
Protection and durability	IP67, 5 g vibration, 10 g shock, 1 m drop test (no boot)
Size and weight	O 118 x 42 x 178 mm (4.65 x 1.65 x 7 in); 0.68 kg (1.5 lb)
Data logging (option DL)	10,000,000 time and pressure records or 5,000,000 with temperature; interval 0.1 s, 1 to 99,999 s
Communication	Bluetooth BLE 4.2, USB-C, RS232
Warranty and certificate	1 year; ISO 17025 accredited calibration certificate with data

Reading the order code

A typical code reads ADT681A-01-GP300-PSI-N-DL-BP. After the model come the accuracy (01, 02, 05, 10, 20 or RD), the range part number from the table (here GP300, a 300 psi gauge range), the range type (PSI, BAR or H2O), the pressure port (N is 1/4 NPT male, N2 1/2 NPT, B and B2 BSP, M M20 x 1.5, AF and AM Autoclave), DL for data logging and BP for the built-in barometer. On the GP2 and CP2 ranges the 0.01% FS accuracy applies to gas media only, so confirm the media when choosing the top accuracy.

Using it in the field

Two points matter most for site safety. The standard ADT681A is not intrinsically safe, and the datasheet says the USB-C and RS232 connectors must not be used in a hazardous area, nor should the batteries be replaced there. Where explosive atmospheres are possible, order the ADT681AEx instead. The sensor is powered continuously in the default super-stable mode, which improves resolution and reduces humidity effects, while the low-power mode switches the sensor off between samples to extend battery life.

Filtering can be set to an average of 3 to 10 samples or a first-order low-pass, which helps on pulsating lines. Sealed gauge construction applies above 1,000 psi, so do not expect vented-gauge behaviour at those ranges. The membrane buttons wipe clean, and the optional all-weather cover and rubber boot protect the display during outdoor use.

Typical duties in Oman and the GCC

Plant calibration teams use gauges like this as a transfer standard for pressure transmitters, test gauges and relief devices on hydraulic and pneumatic test rigs. The 0.1% of reading mode suits wide-range testing, and the logger records leak and hold tests on pipelines and pressure vessels so the data can be filed with commissioning records. Coastal and desert sites benefit from the IP67 case and stainless wetted parts.

Selection and installation notes

Pressure instruments are only as good as their set-up. Check that the pressure range and fitting thread match the system, use the correct adapter and seal, vent the line before connecting and keep the device within its stated temperature range. Leave time for the reading to settle and zero the instrument at atmospheric pressure when the procedure requires it. Keep calibration certificates on file, and plan the re-calibration interval according to your quality system and the duty of the instrument.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Datasheet and quotation

The manufacturer datasheet is attached. Send the range, accuracy, media and port you need and tell us if a hazardous area applies. Other pressure measurement products are in our pressure instrumentation category. Please confirm the full model code before you order.

Datasheets & Documents

Datasheet Additel 681A / 681AEx digital pressure gauges datasheet Download

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About brand

Additel designs portable pressure and temperature calibration equipment, from documenting process calibrators and automatic pressure controllers to digital pressure gauges, hydraulic pumps and dry well calibrators. The company is headquartered in Brea, California, USA.

Seven Star LLC is an independent supplier in Muscat. We list Additel instruments with their official datasheets for instrument and calibration teams in oil and gas, power, water and manufacturing in Oman and the GCC.

Additel product series

Pressure calibration equipment includes the ADT760A and 760S automatic handheld pressure calibrators, the ADT761A portable automatic calibrator, the ADT762 automated hydraulic calibrator and the ADT927 hydraulic test pump for 700 bar. Digital pressure gauges include the ADT681A wireless gauge with accuracy up to 0.01% of full scale and the ADT601Ex intrinsically safe gauge.

The ADT226 is a multifunction documenting process calibrator, and the ADT295 communicates with HART, Foundation Fieldbus and Profibus PA devices. Temperature calibration is covered by the ADT875 dry well calibrators and the ADT878 reference dry well calibrators.

Where Additel instruments are used

Field calibration of pressure and temperature transmitters, gauges, switches and RTDs, loop checks and documented calibration for quality audits, and calibration labs in plants and service companies.

Ordering Additel instruments: what we need

Send the model and pressure range, the medium (gas, oil or water), accuracy class and whether results must be documented. For dry wells give the temperature range, stability and insert size. We confirm the exact model code before ordering.

Browse Additel products by category: Portable Test & Measurement, Pressure Instrumentation.

Frequently Asked Questions

What accuracy options does the Additel ADT681A offer?

The datasheet lists 0.01%, 0.02% or 0.05% of full span, a 0.1% of reading option (RD) and, for the highest ranges, 0.1% or 0.2% FS. The exact figure depends on the range code in the order.

Can the ADT681A measure absolute and differential pressure?

Yes. It is listed for gauge, compound, absolute (calculated from gauge pressure and barometric pressure), differential and barometric pressure, with the range part number selecting the type.

How does the ADT681A communicate?

It has Bluetooth BLE 4.2, a USB-C port and an RS232 port. The datasheet warns not to use the USB-C or RS232 connector in a hazardous area.

How much data can the ADT681A log?

The optional data logging stores up to 10,000,000 time and pressure records, or 5,000,000 records with temperature, at user-selected intervals from 0.1 s and 1 to 99,999 s.

Is there an intrinsically safe 681A?

Yes, the ADT681AEx. The datasheet prints Ex ia IIC T4 Ga for the EU and Class I Zone 0 AEx ia IIC T4 Ga for North America, at -20 to 50 C. Check the certificate for your site.

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