400 Multifunction Instrument Temperature, Humidity, Dew Point, Air Velocity, Pressure, differential pressure, absolute pressure.
The Testo 400 is a multi-function instrument designed to simplify measuring tasks for professionals and tradesmen. Logs data with date, time and location over long time periods using the logger function in the measuring instrument. The measuring instrument guides you through volume flow calculations and calculates, for example, immersion depths, number of measuring points etc.

• Temperature with accuracy to <0.1 °C/°F. 
  Probes have calibration for adjustment capabilities.

• Humidity/Dew point, complete  Mollier diagram values.

• CO and CO2 with ambient levels.

• pressure, differential pressure and also absolute pressure

• Velocity measurements using thermal, vane and 
  Pitot tube probes.

• It also calculates volume flow, max, min and 
  values mention of ASHRAE  Speck's.

• The mV/ mA measurement input easily checks 
  transducers outputs.

• Calculates measuring inaccuracies on location

Description

The precision multifunction instrument and data logger measures temperature, CO,
CO2, rpm, mV and mA, % RH, pressure and velocity.

Rapid measurement with accurate temperature probes.
The instrument can extrapolate the final value for faster response times.

Highest precision due to system calibration (measuring instrument + probe)
Calibration data is saved in the probe.

Calculates all of the physical humidity parameters in the Mollier diagram:
- relative humidity (% RH)
- dew point, pressure dew point (tp, tdp)
- absolute humidity (g/m3)
- humidity levels (g/kg pressure-compensated)
- humidity, wet temperature °C and °F
- water vapor partial pressure in mbar/hPa
- Enthalpy kcal/kg

Humidity probes for every application, from remaining humidity to high humidity levels
Indent guaranteed long-term stability
Highest accuracy ±1 %
All of the conventional types of averaging are available
Volume flow measurement (cfm, m3/min, l/s)
Duct dimensions in the various measurement locations can be saved in the instrument. When the measurement location is called up the saved dimensions can be used to measure cfm.
Measures the barometric pressure (absolute pressure) as a reference value or for the correct Pitot tube measurement.
Measures turbulence levels.

 

Temperature
Pt100
Measuring Range:	-200 to +800 °C (-328 to +1472 °F)
System Accuracy:	up to ±0.1°C / ±0.1°F (Class A, B)
Resolution:	0.01°C (0.01°F)
NiCr-Ni
Measuring Range:	-200 to +1,370°C (-328 to +2498°F)
PtRh-Pt
Measuring Range:	0 to +1,760°C (32 to +3200°F)
FeCu-Ni
Measuring Range:	-200 to +1,000°C (-328 to +1832°F)
NTC
Measuring Range:	-50 to +150°C (-58 to +302°F)
System Accuracy:	up to 0.4°C (0.4°F)
Humidity
Temperature:	-30 °C to +180°C (-22°F to +356°F)
Measuring Range:	0 to 100% RH
System Accuracy:	up to ±1.0 % RH
Pressure
Measuring Range:	±0.1 bar ±0.01bar  2 bar 10 bar 30 bar
Velocity
Vane Measuring Range:	0 to 60 m/s (0 to 12,000 fpm)
Thermal Measuring Range:	0 to 20 m/s (0 to 4,000 fpm)
Pitot tube measuring range:	0 to 10 mbar / 100 mbar  0 to 40 m/s / 100 m/s (0 to 8,000 / 20,000 fpm)
Volume flow in l/s, m3/min, m3/h
Measuring Range:	360.000 cfm (max. calculated at 1 m2, 20,000 fpm  values)
CO
Measuring Range:	0 to 500 ppm
Accuracy:	±5 ppm
CO2
Measuring Range:	0 to 10,000 ppm  0 to 1 vol. %
Accuracy:	±5% of m.v. or 100 ppm
RPM
Measuring Range:	0.333 to 333 Hz  20 to 20,000 rpm
Accuracy:	±1 digit
Current Voltage
Measuring Range:	0 to 20 mA / 4 to 20 mA  0 to ±10 V / 0 to ±1 V
General technical data
Memory space
Basic version:	15 kB, corresponds to approx.  7,500 meas. values
Optional version:	1 MB, corresponds to approx.  500,000 meas. values
Power supply:  alternatively:	battery / rechargeable battery  8 V mains unit
Rechargeable battery lifetime:	18 h (continuous oper. w.   2 thermocouple probes)
Operation temperature:	0 to +50 °C (32 to +122°F)  short-term 0 to +60°C (32 to +140°F)
Storage/transport temperature:	-25 to +60°C (-13 to +140°F)
Weight:	650 g (incl. rech. battery) 1 lbs. 7 oz.
Other factors:	- Automatic recognition of all connected probes  - RS 232 interface for data management
Warranty:	Instrument: 3 years  Probe: 1 year

There are a lot of probes available including immersion/penetration, surface, air, and flue gas probes. For more information on these probes, click on "Request Additional Information" below.