The ADT 681 digital differential pressure gauge, now with IECEX hazardous approval, provides an accurate, reliable and economic solution for a wide range of pressure applications. A selection of accuracy specifications is available to suit your budget and requirements.

More Information

Features

Measure and source 13 T/Cs, 11 RTDs, mV, mA, Ohms, frequency and pulses
Accuracy to 0.01% of reading
Pressure via
external pressure modules
up to 70,000kPa
24V loop power
Task management capability, upload, download and document
Easy to use smartphone type menu and interface
Rugged design for use in harsh environments

Specifications

• Model
ADT681: Regular gauge
ADT681IS: ATEX certified intrinsically safe

• Accuracy
681(IS)-02: 0.02% of full scale
681(IS)-05: 0.05% of full scale
681(IS)-10: 0.1% of full scale
681(IS)-20: 0.2% of full scale
681(IS)-RD: 10 to 20% of range: 0.02% of full scale
20% to 110% of range: 0.1% of reading
Vacuum: 0.25% of full scale.
(For detailed accuracy, please see pressure range table)

• Gauge Types
Gauge pressure
Compound pressure
Absolute pressure
Differential 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

• Environmental
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
1/4NPT male, 1/4BSP male, M20×1.5 male (≤15,000 PSI)
1/4HP female or 1/4HP male(≥15,000 PSI)
*1/4HP female: Autoclave F-250-C, 9/16″ – 18 UNF-2B
*1/4HP male: Autoclave M-250-C, 9/16″ – 18 UNF-2A
0.236 inch (Ø6 mm) test hose (for differential pressure)
Other connections available per request

• Power
Battery: One 9V alkaline battery (included)
Battery life: 300 hours (10 readings/s), 600 hours (3 reading/s), or 6000 hours (1 reading/10s)
Power auto-off: 60 minutes power auto-off. Auto-off may be disable
External power: 110/220V external power adapter (optional)
*(Do not use the external power adapter in a hazardous atmosphere)

• 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

• Data Logging
Data storage: 21,843 records (each record includes date, time, pressure and temperature)
Rate: user-selectable from 1 to 99,999 second intervals

• Intrinsic Safety and European Compliance
CE marked
ATEX certified intrinsically safe (ADT681IS)
*(Rubber boot for ADT681 is not ATEX certified)

• Communication:
RS232 *(Do not use the RS-232 connector in a hazardous atmosphere)

• Warranty: 1 year

• Pressure Range

Gauge Pressure [1]
P/N	Pressure Range		Media [2]	Accuracy(%FS)	Burst Pressure
P/N	(psi)	(bar)	Media [2]	Accuracy(%FS)	Burst Pressure
V15	-15	-1.0	G	0.02 (0.05,0.1, 0.2)	3×
GP2	2	0.16	G	0.05 (0.1, 0.2)	3×
GP5	5	0.35	G	0.05 (0.1, 0.2)	3×
GP10	10	0.7	G	0.05 (0.1, 0.2)	3×
GP15	15	1.0	G, L[3]	0.02 (0.05, 0.1, 0.2)	3×
GP30	30	2.0	G, L[3]	0.02 (0.05, 0.1, 0.2)	3×
GP50	50	3.5	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP100	100	7.0	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP300	300	20	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP500	500	35	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP600	600	40	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP1K	1,000	70	G, L	0.02 (0.05, 0.1, 0.2)	2×
GP2K	2,000	140	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP3K	3,000	200	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP5K	5,000	350	G, L	0.02 (0.05, 0.1, 0.2)	3×
GP10K	10,000	700	G, L	0.02 (0.05, 0.1, 0.2)	2×
GP15K	15,000	1,000	G, L	0.05 (0.1,0.2)	2×
GP20K	20,000	1,400	G, L	0.05 (0.1,0.2)	1.5×
GP25K	25,000	1,600	G, L	0.1 (0.2)	1.5×
GP30K	30,000	2,000	G, L	0.1 (0.2)	1.5×
GP36K	36,000	2,500	G, L	0.1 (0.2)	1.5×
GP40K	40,000	2,800	G, L	0.1 (0.2)	1.1×

Compound Pressure
P/N	Pressure Range		Media	Accuracy(%FS)	Burst Pressure
P/N	(psi)	(bar)	Media	Accuracy(%FS)	Burst Pressure
CP2	±2	±0.16	G	0.05(0.1,0.2)	3×
CP5	±5	±0.35	G	0.02 (0.05,0.1,0.2)	3×
CP10	±10	±0.7	G	0.02 (0.05,0.1,0.2)	3×
CP15	±15	±1	G	0.02(0.05,0.1,0.2)	3×
CP30	-15 to 30	-1 to 2	G	0.02(0.05,0.1,0.2)	3×
CP100	﹣15 to 100	﹣1 to 7	G, L	0.02(0.05,0.1,0.2)	3×
CP300	﹣15 to 300	﹣1 to 20	G, L	0.02(0.05,0.1,0.2)	3×

Absolute Pressure
P/N	Pressure Range		Media	Accuracy(%FS)	Burst Pressure
P/N	(psi)	(bar)	Media	Accuracy(%FS)	Burst Pressure
AP5	5	0.35	G	0.1 (0.2)	3×
AP10	10	0.7	G	0.1 (0.2)	3×
AP15	15	1.0	G	0.1 (0.2)	3×
AP30	30	2.0	G	0.1 (0.2)	3×
AP50	50	3.5	G	0.1 (0.2)	3×
AP100	100	7.0	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	1,000	70	G, L	0.05 (0.1,0.2)	2×
AP3K	3,000	200	G, L	0.05 (0.1,0.2)	3×
AP5K	5,000	350	G, L	0.05 (0.1,0.2)	3×

Differential Pressure
P/N	Pressure Range		Media	Accuracy (%FS)	Burst Pressure	Static Pressure Range
P/N	(inH2O)	(mbar)	Media	Accuracy (%FS)	Burst Pressure	Static Pressure Range
DP1	±1	±2.5	G	0.05	100×	±10 psi
DP2	±2	±5.0	G	0.05	100×	±10 psi
DP5	±5	±10	G	0.05	50×	±10 psi
DP10	±10	±25	G	0.05	20×	±10 psi
DP20	±20	±50	G	0.05	20×	±10 psi
DP30	±30	±75	G	0.05	15×	±10 psi
DP50	±50	±160	G	0.05	3×	±10 psi
DP150	±150	±350	G	0.02 (0.05)	3×	50 psi
DP300	±300	±700	G	0.02 (0.05)	3×	50 psi

*Note: [1]. Sealed gauge pressure for above 1000 psi
[2]. G=Gas, L=Liquid (please specify media type when place order)
[3]. 0.02% FS for gas media only

** One year accuracy (including yearly stability) except DP1 and DP2 range
which is 0.05%FS calibration accuracy and 0.05%FS yearly stability.