Brandt Instruments distributing TSI Air Velocity Meters, Ventilation Meters, IAQ Meters, Micromanometers & Thermohygrometers

Environmental Monitoring & Industrial Hygiene Instrumentation
Brandt Instruments Distributing TSI 
DP-CALC Micromanometers

TSI DP-CALC Micromanometers, models 5815-5825

DP-CALC Micromanometers
Models 5815 and 5825
(Replace Models 8702/8705)

The TSI DP-Calc 5815 and 5825 micromanometers allow you to easily make HVAC pressure measurements. TheDP-Calc instruments can be used with Pitot probes to measure duct velocity. The DP-Calc 5815 is a simple to operate, hand held digital Micromanometer for fast, accurate differential and static pressure measurements. The high performance DP-CALC™ 5825 can calculate flow and has data logging capabilities.

Features and Benefits
  • Measure differential and static pressure from -15 to +15 in. H2O (-3735 to +3735 Pa)
  • Calculate and display velocity when using a Pitot tube
  • Variable time constant
  • Statistics

  • HVAC commissioning and troubleshooting
  • Testing and balancing
  • Pitot tube duct traverses
  • Static pressure measurements
  • Pressure drop across filters, coils, fans, and diffusers
  • Environmental air flow testing

5825 DP-Calc digital differentail pressure monitor

Model Comparison DP-Calc 5815 vs 5825



Differential and static pressure x x
Velocity with pitot tube x
Sample statistics x
Volumetric flow rate x
Actual and standard velocity x
Variable time constant x
LogDat2 downloading software x
K factor x
Certificate of Calibration x x

Specifications: DP-CALC Models 5815 and 5825

Static/Differential Pressure
 Range1 -15 to +15 in. H2O ( -28.0 to +28.0 mm Hg, -3735 to +3735 Pa)
 Accuracy ±1% of reading ±0.005 in. H2O
(±0.01 mm Hg, ±1 Pa)
 Resolution 0.001 in. H2O (0.1 Pa, 0.01 mm Hg)
Velocity (Pitot Tube)
Range2 250 to 15,500 ft/min (1.27 to 78.7 m/s)
Accuracy3 ±1.5% at 2,000 ft/min (10.16 m/s)
Resolution 1 ft/min (0.1 m/s)
Duct Size (5825) 1 to 250 inches in increments of 0.1 in. (1 to 635 cm in increments of 0.1 cm)
Volumetric Flow Rate (5825)
Range Actual range is a function of velocity, pressure, duct size, and K factor
Instrument Temperature Range
Operating 40 to 113°F (5 to 45°C)
Storage -4 to 140°F (-20 to 60°C)
Data Storage Capabilities (5825)
Range 12,700+ samples and 100 test IDs
Logging Interval (5825) 1 second to 1 hour
Time Constant (5825) User selectable
External Meter Dimensions 3.3 in. x 7.0 in. x 1.8 in. (8.4 cm x 17.8 cm x 4.4 cm)
Meter Weight with Batteries 0.6 lbs. (0.27 kg)
Power Requirements Four AA-size batteries (5815)
Four AA-size batteries or optional AC adapter (5825)
1 Overpressure range = 190 in. H2O (7 psi, 360 mmHg, 48 kPa).
2 Pressure velocity measurements are not recommended below 1,000 ft/min (5 m/s).
3 Accuracy is a function of converting pressure to velocity. Conversion accuracy improves when actual pressure values increase.

Specifications are subject to change without notice


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