Laurel RTD Temperature Panel Meter / Controller

The Laureate™ RTD meter is factory calibrated for four Resistance Temperature Detector (RTD) types: 100 ohm platinum (Pt 100) with DIN alpha of 0.00385, 100 ohm platinum (Pt 100) with ANSI alpha of 0.003902, 10 ohm copper with alpha of 0.00427, and 120 ohm nickel with alpha of 0.00672. The entire span of each RTD type is presented in a single range. The RTD type, unit of measure (°C or °F) and resolution (1°, 0.1° or 0.01°) are selectable from the front panel or via the meter's serial interface. Display in Kelvin or Rankin is selected by offsetting the Celsius or Fahrenheit ranges.

RTD connections can be via 2, 3 or 4 wires. With 3 or 4-wire connections, the meter automatically compensates for lead resistance to the sensor. With 2-wire connection, the meter can measure and then subtract the lead wire resistance.

All ranges for all RTD types are digitally calibrated at the factory, with calibration factors stored in an EEPROM on the signal conditioner board. This allows temperatures sensors and signal conditioner boards to be changed in the field without recalibrating the meter.

High read rates at up to 60 or 50 conversions per second while integrating the signal over a full power cycle are provided by Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, real-time computer interface, and control. Peak and valley values are standard. These may be displayed via a front panel pushbutton command or a control signal at the rear connector, or be transmitted as serial data.

Digital filtering is selectable for electrically noisy environments or resolution to 0.01°, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time to follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Key Features

Accepts 100Ω platinum, 10Ω copper & 120Ω nickel RTDs
2, 3 or 4-wire connection with lead resistance compensation
Highly accurate and repeatable
Selectable 1º, 0.1º, or 0.01º resolution
Selectable Celsius, Fahrenheit, Kelvin or Rankin scales
Up to 60 conversions per second
Peak or valley display
Universal AC power, 85-264 Vac
NEMA 4X, 1/8 DIN case

Options

Serial communications: Ethernet Interface, Ethernet-to-RS485 server, USB Interface, USB-to-RS485 server, RS485 interface (dual RF11), RS485 Modbus interface (dual RJ45), RS232 interface.
Low voltage power: 10-48 Vdc or 12-32 Vac
Relay outputs: 2 or 4 relays, contact or solid state
Analog outputs: Isolated 4-20 mA, 0-20 mA, 0-10V, 10 to +10V