SMG/interlink®
Serving our customers since 1994

Instruments for Environmental, Health and Safety Professionals,
HVAC Engineers and Technicians, Manufacturing Engineers,
Quality Control and Laboratory Professionals

testo 521-526 Series Micromanometers Multifunction Meters

The testo 521 series

The 521 multifunction meter with the built-in micromanometer is configured for differential pressure measurements in the HVAC range of 0 to 40" wg (0-100 hPa), e.g. pressure drops across filters or inspection of fans or extraction equipment. The meter has nine user selectable display pressure units: in H₂O, mbar, hPa, bar, Pa, kPa, mmH₂O, torr and psi. Flexibility is enhanced as additional probes can be connected to testo 521/526 pressure meters via 2 user defined probe sockets.

Pitot tube measurement: Flow velocities of 985 20,000 ft/min (5 - 100 m/s) are measured via the internal pressure sensor. The external 0.4 in H2O (100 Pa) probe allows precise measurements in the 200 – 2,400 ft/min (1 - 12 m/s). The advantages during flow measurement are direct calculation of the flow velocity and volume flow, averaging by points and time and automatic tightness compensation.

The testo 526 series

The 526 multifunction pressure meters have a range from 0 to 80" H2O (0 to 2000 hPa) and are designed for industrial applications, where critical processes require measurement and monitoring with accuracy up to 0.05 % of full scale value.

Pressure test: The integrated test menu on the testo 526 series manometers permits seamless recording, particularly for leak tests in containers. The data can be subsequently processed using software or printed out via the printer so that the pressure test is documented. The testo Comsoft3 easy to use software contains data base, analysis, trend, and chart functions.

Advantages of the 521

Two probe sockets for connecting additional probes for measuring pressure, temperature, current and voltage
Dynamic pressure measurement at a measuring frequency of 0.04 seconds to once every 24 hours, user selectable
Calculation of flow velocity and volume flow via pitot tube
Transmitter signal with a 0/4...20 mA interface
Available in 2 accuracy classes: 0.2 % and 0.1 % of full scale value

Additional Advantages of the 526

Verification of pressure drop in tanks, pipes etc. via the integrated test menu
Measurement of leakage rate (time-dependent pressure drop)

Available in 2 accuracy classes: 0.1 % and 0.05 % of full scale value

521-526 Manometer Common Data
Sensor Type	Piezoresistive pressure sensor for external pressure probes	Ceramic sensor for external pressure probes	NTC / Thermistor Probes
Measuring Range	0 to 800 in H2O 0 to 2000 hPa	-33.5 to 13,382 in H2O (-1 to 400 bar)	-40 to 302°F -40 to +150° C
Accuracy	±0.1% of reading	±0.2% of reading	±0.2°C (-10 to 50°C) ±0.4°C (rem. meas. range) 0.1°C
Resolution	0.1 Pa (0638 1347) 0.001 hPa (0638 1447) 0.01 hPa (0638 1547) 0.1 hPa (0638 1647; 0638 1747; 0638 1847)	±4.0 in H2O (±0.01 bar)	0.1° F 0.1° C
Sensor Type	Type K (NiCr-Ni)	Volt measurement (0554 0007)	Current Measurement (0554 0007)	Current Measurement (0554 0528)
Range	-328 to 2498°F -200.0 ... 1370.0°C	0 to 10 volt	0 to 20 mA	0 to 20 mA
Accuracy	±1.0 °C (-200.0 to -100.0 °C) ±0.4 °C (-100.0 to 200.0 °C) ±1.0 °C (200.0 to 1370.0 °C)	± 0.01 V	±0.01 mA	See sensor data
Resolution	0.1°F 0.1°C	0.01 V	0.01 mA	0.01 mA
Operating Temp (compensated)	0.0...50.0 °C
Storage Temp	-20.0...70.0 °C
Battery Type	9 volt (6LR61)
Battery Life	AlMN rechargeable battery: 30 hours NiMH: 10 hours Zinc Carbon: 18 hours	Miscellaneous	AC connection & battery charging connection built into the instrument
Housing	ABS	Connections	Hose: Ø internal 4 mm Ø external 6 mm
Display	LCD Display with symbol, 7-segment display and dot matrix
Refresh Rate	2x per second, for quick measurements 4x per sec.
Memory	100 KB - corresponds to approx 25,000 measurements
PC	RS232 Interface
Warranty	2 years

Technical Data
	521-1	521-2	526-1	526-2
Pressure Sensor Type	Piezoresistive pressure sensor		Piezoresistive pressure sensor
Measuring Range	0 to 40 in H2O 0 to 100 hPa		0 to 800 in H2O 0 to 2000 hPa
Overload	120 in H2O (300 hPa)		1,200 in H2O (3000 hPa)
Static Pressure	800 in H2O (2000 hPa)		800 in H2O (2000 hPa)
Accuracy ±1 digit	±0.2% full scale	±0.1% full scale	±0.1% full scale	±0.05% full scale
Resolution	±0.0004 in H2O (±0.0010 hPa)		±0.004 in H2O (±0.01 hPa (0.0 to 1000.0 hPa)) ±0.04 in H2O (±0.1 hPa (1000.0 to 2000.0 hPa))
Dimensions	8.6" x 2.7" x 2" (219.0 x 68.0 x 50.0 mm)		9" x 2.7" x 2" (229.0 x 68.0 x 50.0 mm)
Weight	10.58 Oz (300g)		11.36 oz (322g)

Ordering information and Accessories

Model #	Description
0560 5210	testo 521-1 Differential pressure meter 0 to 40 in H2O (100 hPa) including battery and calibration certificate. Accuracy ±0.2% full scale
0560 5211	testo 521-2 Differential pressure meter 0 to 40 in H2O, (100 hPa) including battery and calibration certificate. Accuracy ±0.1% full scale
0560 5280	testo 526-1 Differential pressure meter 0 to 800 in H2O (0 to 2000 hPa) including quick-release coupling, battery and calibration certificate. Accuracy ±0.1% full scale
0560 5281	testo 526-2 Differential pressure meter 0 to 800 in H2O (0 to 2000 hPa) including quick-release coupling, battery and calibration certificate. Accuracy ±0.05% full scale
0554 0545	testo IR printer, 1 roll of thermal paper, 4 AA size batteries
0409 0178	RS232 Computer Interface Cable
0554 0830	Comsoft3 Software used by all datalogging instruments
0516 0446	TopSafe protective case
0604 0493	Temp - Immersion-penetration probe (-330 to 1112° F)
0610 9714	Temp - Air and gas probe with fixed cable
0604 0194	Temp - Surface sensor with spring action thermocouple strip
0600 4593	Temp - Pipe wrap probe (up to 2" diameter) flow temp measurement
0638 1847	Absolute pressure probe interface 0 – 800 in H2O (0-2000 hPa)
0430 0143	* Probes requiring cables – standard 5’ cable
0430 0145	* Probes requiring cables – longer 16’ cable
0638 1347	Differential pressure probe, 0 – 0.4 in H2O (0-100 Pa)
0638 1447	Differential pressure probe, 0 – 4 in H2O (0-10 hPa)
0638 1547	Differential pressure probe, 0 – 40 in H2O (0-100 hPa)
0638 1647	Differential pressure probe, 0 – 400 in H2O (0-1000 hPa)
0638 1747	Differential pressure probe, 0 – 800 in H2O (0-2000 hPa)
0409 0202	**Cable, 2.5 m for probes 0638 1347/1447/1547/1647/1747
0635 2145	Pitot tube 14" long stainless steel (350 mm)
0635 2045	Pitot tube 20" long stainless steel (500 mm)
0554 0440	Silicone Hose
0554 0441	Connecting hose set
0516 0527	Transport case
0516 0526	System case

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Interlink Marketing Corporation
dba SMG/interlink®
PO Box 260795
Plano, Texas 75026
Toll free 1-800-804-6196
Ph: 972-985-0883
Fx: 972-985-3252
2203 Glen Forest Ln
Plano, Texas 75023

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