Intrinsically Safe Loop Powered Dewpoint Meter
Intrinsically Safe Loop Powered Dewpoint Meter: the HDT utilizes Hyper-Thin-Film (HTF™) high capacitance aluminum oxide sensors, offering a measuring range of -100°C to +20°C (-148°F to +68°F). These sensors provide superior accuracy, response speed, and stability compared to conventional aluminum oxide or polymer sensors. Designed for tough, high-pressure, and liquid applications, the HDT sensor remains unaffected by condensation and liquid water, resuming measurements without recalibration once dried.
HART-Compliant Transmitter
The HDT is a HART-compliant dew point transmitter, featuring loop-powered analog and digital outputs. Encased in a 32 mm (1.25”) stainless steel housing with a total length of 136 mm (5.36”), including a 9.4 mm four-pin connector, it is the world’s smallest loop-powered dew point transmitter.
Analog Output Loop
Drawing 4-20mA from the power supply, the output is linear to factory-programmed units, such as °C(dp), with an output resolution of 0.1°C(dp) or 0.25uA, whichever is greater. The output range is programmable.
Digital Output Loop
The HDT provides a digital output by modulating the 4-20mA loop line, defined by HART. In digital mode, the HDT can be remotely operated, allowing for dew point and temperature readings. Multiple units can operate on the same loop cable as a multi-channel instrument, each drawing a fixed 4mA independent of the measured dew point.
Built-in Alarm
A factory programmable dew point alarm signal is available through a digital output pin. External devices or relays can be operated via the analog or digital loops.
Connections
The HDT interfaces with both metric 14 mm x 1.25 mm threads and unified 3/4″-16 threads, with other thread forms available per specifications. It connects through an inexpensive two-conductor cable over long distances.
Measurement Accuracy/Stability
Utilizing a multi-point calibration table, the HDT provides temperature-compensated dew point readings from -10°C to +70°C (+14°F to +158°F), ensuring accurate measurements over its full range, even in extreme temperature conditions, such as outdoor installations or proximity to heat sources.
A typical sample system for measuring at atmospheric pressure includes a digital display panel meter that provides power and display, with optional relays.
Features
- Leverages rugged, waterproof, fast, and accurate HTF™ Aluminum Oxide Sensor Technology.
- Operates on loop-powered (two-wire) 5 to 28 VDC.
- Offers Digital (HART Compliant) Output.
- Provides Analog (4-20mA) Output.
- Includes a programmable alarm signal.
- Encased in stainless steel housing.
- Uses an IP65 rated connector (with optional IP66 or IP67).
- Designed with a compact form factor.
- Incorporates temperature-compensated calibration.
- Suitable for installations at both pressure and ambient conditions.
