DP-Calc Micromanometers

DP-Calc Micromanometers

  • TSI - 5815 & 5825

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Model 5825

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

Added Features Model 5825

  • Calculates flow
  • Data logging with time and date stamp
  • Stores 12,700+ samples and 100 test IDs
  • Includes LogDat2™ downloading software
  • Programmable K factors

The DP-CALC 5815 and 5825 micromanometers allow you to easily make HVAC pressure measurements. These robust 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.


  • 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

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±0.005 in. H2O (±0.01 mm Hg, ±1% of
reading ±1 Pa)
Resolution0.001 in. H2O (1 Pa, 0.01 mm Hg)
Velocity (Pitot Tube)
Range2250 to 15,500 ft/min (.27 to 78.7 m/s)
Accuracy3±1.5% at 2,000 ft/min (10.16 m/s)
Resolution1 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)
RangeActual range is a function of velocity, pressure,
duct size, and K factor
Instrument Temperature Range 
Operating32 to 158°F (0 to 70°C)
Storage-40 to 185°F (-40 to 85°C)
Data Storage Capabilities
Range12,700+ samples and 100 test IDs
Logging Interval 
1 second to 1 hour
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 or optional AC adapter
Differential and static pressure
Velocity with pitot tube
Calibration Certificate
Sample statistics 
Volumetric flow rate 
Actual and standard velocity 
Variable time constant 
LogDat2 data logging software 
K factor