USEA Amplifier for sensors with low O/P's in mV or µV

EME Systems


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The Sensor measures: mV, Vdc, 0-20 mA, 4-20 mA
Output Signal: mV
Power Supply: 2.5 Vdc
Sensor for use in: Indoor

- USEA Universal Amplifier: amplifies the sensors low DC output signal to the logger.
- Input for µV or mV: Amplified Output for a data logger.
- Amplifier Factor: x2,5, 10, 1520, 50, 100, (seleccionable por puente) 200, 500, 1000, 1500.
- Does not require external power supply if connected to a HOBO logger (specify: USEA/HOBO).
- Output to an external input channel of a HOBO logger (0 - 2,5Vdc).

The Universal Single Ended Amplifier (USEA) provides a simple interface from low-level sensors to voltage input data loggers, chart recorders, HVAC, and control systems.

The USEA is a two stage non-inverting amplifier, voltage input to voltage output. It is optimized for amplification of low-level DC signals from transducers/sensors. The calibration for the sensor, in conjunction with the gain setting of the USEA, can be used to compute the instantaneous signal level with a high degree of accuracy. Two internal jumper blocks allow the user to select any one of ten gain settings ranging from x1 to x2250.

Specify gain required. 

There are a number of fixed gain settings that are user selectable. To see which gain settings are available, please see the manual.

Other gain settings are available on special order. An internal adjustment allows calibration to intermediate settings, either at the factory or by the end user. The USEA features a CAZ (Commutating Auto Zeroing) operational amplifier to achieve input offset voltage of typically 5 microvolts, and high accuracy, for amplification of small signals. The amplifier is designed for use with thermopile light sensors, O2 sensors, or any sensor that produces a small voltage that must be amplified to a higher level for interface to a data logger or control system. An option that can be installed at the factory is provision for an offset from zero, for sensors such as Net Radiometers that produce bipolar signals.


USEA OPTIONS (Specify in optional Accessories):

USEA: USEA Standard with polycarbonate box and two through frame.
USEA/HOBO: Use with HOBO Onset Recorders; Powered from the HOBO's internal 2.5V battery
USEA/offset: offset adjustment to a millivolt value (specify)

  • Supply Volts: 5 to 18 Volts DC or from the HOBO Logger (specify /HOBO in Optional Accessories)
  • Supply Current: less than 2 mA
  • Supply Voltage variation effect: less than 0.01% per Volt
  • Temperature variation effect: less than 0.01% per ºC
  • Fixed input offset voltage: less than 10 microvolts.
  • Optional input offset adjustment: 0 to +30 millivolts referred to the input.
  • Minimum saturation output voltage: 0.01 volt
  • Maximum output voltage: Supply-2 volts
  • Available Gain Settings : 2,5,10,1520,50,100, (jumper selectable), 200,500,1000,1500 and continuous adjustment between these settings.
  • Gain accuracy of setting ordered from the factory, +/- 0.1%
  • Gain accuracy of other jumper settings, +/- 1%
  • Output impedance: 1000 ohms
  • Input impedance: Greater than 10 Mohms
  • Zener anti-zap protection at the input.
  • Response time: <10ms for 90%fs step.
  • Enclosure: 2' x 2.5' x 1.4' NEMA 4 Polycarbonate
  • Temperature, -25 to +70 degrees Celsius
  • Gland nuts for cable entry, optional BNC input connector.

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