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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.

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• Precision pressure measurement
• Field gauge calibration
• Pressure safety valve (PSV) testing
• Pressure regulator testing

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Gauge Pressure[1]
P/N	Pressure Range		Media[2]	Accuracy		Burst Pressure
	psi	bar		%FS	%RD
V15	-15	-1	G	0.02 (0.05, 0.1, 0.2)	N/A	3×
GP2	2	0.16	G	0.05 (0.1, 0.2)	N/A	3×
GP5	5	0.35	G,L	0.05 (0.1, 0.2)	0.1	3×
GP10	10	0.7	G,L [3]	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP15	15	1	G, L[3]	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP30	30	2	G, L[3]	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP50	50	3.5	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP100	100	7	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP150	150	10	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP300	300	20	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP500	500	35	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP600	600	40	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP1K	1000	70	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP2K	2000	140	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP3K	3000	200	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP5K	5000	350	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP10K	10000	700	G, L	0.02 (0.05, 0.1, 0.2)	0.1	3×
GP15K	15000	1000	G, L	0.05 (0.1,0.2)	0.1	2×
GP20K	20000	1400	G, L	0.05 (0.1,0.2)	N/A	1.5×
GP25K	25000	1600	G, L	0.1 (0.2)	N/A	1.5×
GP30K	30000	2000	G, L	0.1 (0.2)	N/A	1.5×
GP36K	36000	2500	G, L	0.1 (0.2)	N/A	1.5×
GP40K	40000	2800	G, L	0.1 (0.2)	N/A	1.35×
GP50K	50000	3500	G, L	0.1 (0.2)	N/A	1.2×
GP60K	60000	4200	G, L	0.1 (0.2)	N/A	1.1×
[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/N	Pressure Range		Media	Accuracy	Burst Pressure
	Low	High
BP	60 kPa	110 kPa	G	40 Pa	3×

Absolute Pressure
P/N	Pressure Range		Media[1]	Accuracy(%FS)	Burst Pressure
	psi	bar
AP5	5	0.35	G	0.1 (0.2)	3×
AP10	10	0.7	G	0.1 (0.2)	3×
AP15	15	1	G	0.1 (0.2)	3×
AP30	30	2	G	0.1 (0.2)	3×
AP50	50	3.5	G	0.1 (0.2)	3×
AP100	100	7	G, L	0.05 (0.1, 0.2)	3×
AP300	300	20	G, L	0.05 (0.1, 0.2)	3×
AP500	500	35	G, L	0.05 (0.1, 0.2)	3×
AP1K	1000	70	G, L	0.05 (0.1, 0.2)	3×
AP3K	3000	200	G, L	0.05 (0.1, 0.2)	3×
AP5K	5000	350	G, L	0.05 (0.1, 0.2)	3×
[1] G=Gas, L=Liquid

Differential Pressure
P/N	Pressure Range		Media	Accuracy (%FS)[1]	Burst Pressure	Static Pressure Range
	(inH2O)	(mbar)
DP1	±1	±2.5	G	0.05[2]	100×	±10 psi
DP2	±2	±5.0	G	0.05[2]	100×	±10 psi
DP5	±5	±10	G	0.05[2]	50×	±10 psi
DP10	±10	±25	G	0.05[2]	20×	±10 psi
DP20	±20	±50	G	0.05	20×	±10 psi
DP30	±30	±75	G	0.05	20×	±10 psi
DP50	±50	±160	G	0.05	3×	±10 psi
DP100	±100	±250	G	0.02	3×	±15 psi
DP150	±150	±350	G	0.02 (0.05)	3×	50 psi
DP300	±300	±700	G	0.02 (0.05)	3×	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/N	Pressure Range		Media[1]	Accuracy (%FS)[1]		Burst Pressure
	psi	bar		%FS[2]	%RD
CP2	±2	±0.16	G	0.05 (0.1,0.2)	N/A	3×
CP5	±5	±0.35	G	0.02 (0.05,0.1,0.2)	0.1	3×
CP10	±10	±0.7	G	0.02 (0.05,0.1,0.2)	0.1	3×
CP15	±15	±1	G	0.02 (0.05,0.1,0.2)	0.1	3×
CP30	-15 to 30	-1 to 2	G	0.02 (0.05,0.1,0.2)	0.1	3×
CP100	﹣15 to 100	﹣1 to 7	G, L	0.02 (0.05,0.1,0.2)	0.1	3×
CP300	﹣15 to 300	﹣1 to 20	G, L	0.02 (0.05,0.1,0.2)	0.1	3×
[1] G=Gas, L=Liquid [2] FS specification applies to the span of the range.

General Specifications
Model	ADT681	ADT681IS
Description	Digital Pressure Gauge	Intrinsically Safe Digital Pressure Gauge
Intrinsic Safety & European Compliance	CE 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 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
Enviromental	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	15,000 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
Power	Battery: 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)
Enclosure	Case 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
Compliance	Protection 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
Communication	RS232 (Do not use the RS-232 connector in a hazardous atmosphere)
Warranty	1 year

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File name	Upload Date	Size
Additel 681 series Digital Pressure Gauge Datasheet	2018.3.27	0.7 MB
Additel 681 series Digital Pressure Gauge User Manual	2019.3.21	80.5 MB
Additel Pressure Gauge Selection Guide	2019.5.21	0.3 MB
Additel Gauge Resolution Datasheet	2020.3.11	0.2 MB