GIGA Electronics Ltd
The PT-104 is a four-channel temperature measuring data logger. It offers the ultimate in resolution (0.001 °C) and accuracy (0.015 °C). Along with temperature it can also be used to measure resistance and voltage.
Although accurate temperature sensors are widely available, it has been difficult to take advantage of them due to errors caused by the measuring device. Your PT-104, however, is inherently accurate due to its innovative design. Rather than relying on voltage references, which tend to be temperature-sensitive, it uses reference resistors, which are extremely stable with low temperature coefficient and drift. The exact value of each resistor is stored in an EEPROM to provide the ultimate in accuracy (yearly recalibration is recommended). A high-performance 24-bit ADC is used to achieve the 0.001 °C resolution.
The PT-104 measures temperature using platinum resistance thermometers (PRTs). Both common industry standards (PT100 and PT1000) are supported. The unit is compatible with two, three and four-wire sensors (four-wire PT100 sensors are recommended for accurate measurements). A wide range of PT100 sensors are available for use with your PT-104.
For voltage measurements, each input connector can be treated as a differential input with ground, or two single-ended inputs. Both inputs must be zero volts or above, though it does not matter which input has the higher voltage.
Two voltage ranges are available (0 to 115 mV and 0 to 2500 mV). For the most accurate measurements use the 0 to 2500 mV range.
When measuring resistance, the PT-104 uses a four-wire circuit to give the greatest possible accuracy. Two resistance ranges are available (0 to 375 Ω and 0 to 10,000 Ω). The unit is calibrated for 0 to 375 Ω so this range should be used for accurate measurements.
Single channel screw terminal adaptor
Interfacing third-party sensors not fitted with the 4-pin mini-DIN connector or measuring voltage or resistance is possible using the PP660 screw terminal adaptor. This inexpensive adaptor has 4 breakout terminals and occupies a single channel of the PT-104.