Description
Honeywell 51401546-150
Technical Specifications Channel Count: 16 RTD input channels Supported Sensor Type: Pt100, Pt1000 Wiring Mode: 2-wire, 3-wire, 4-wire configurable Constant Current Excitation: 0.2mA per channel Measurement Range: -200℃ to 850℃ Power Supply: 5V DC Power Consumption: 7.4W Operating Temperature Range: 0℃ to 60℃ Storage Temperature Range: -40℃ to 85℃ Isolation Withstand Voltage: 1500V AC Relative Humidity: 5% to 95%, non-condensing
Functional Features It supports software switching of 2-wire, 3-wire and 4-wire RTD wiring compensation algorithm. It provides high-stability constant current excitation for each RTD channel. It carries out wire resistance compensation to eliminate measurement error caused by long field cables. It detects open circuit and short circuit of RTD sensor and field wiring. It supports hot swap operation. It stores RTD type and wiring mode configuration parameters in non-volatile memory. It uploads real-time temperature value and channel fault status to the DCS system.
Application Scenarios Pipeline medium temperature monitoring for water, steam and oil pipelines. Bearing temperature monitoring of large pumps, fans and compressors. Tank liquid temperature measurement for crude oil and chemical storage tanks. Replacement and spare stocking for aging RTD multiplexer cards in legacy TPS systems.
Performance Parameters Measurement Resolution: 0.01℃ Full Scale Accuracy: ±0.12% FS Channel Scan Period: 2.5ms per channel Constant Current Drift: ≤10ppm/℃ Non-volatile memory retention time: 10 years without external power supply
Material Composition PCB Substrate: High-TG flame-retardant FR-4 multi-layer glass fiber board, analog and digital circuit partition layout High-stability constant current source chip High-precision ADC conversion chip RTD linearization logic FPGA chip Gold-plated back edge fingers Gold-plated field terminal block contacts Cold-rolled steel front panel with electrostatic spray coating
Structural Features Standard European pluggable card structure, installed in dedicated analog I/O slot of UCN I/O rack. Front panel is equipped with run indicator light, fault indicator light and channel fault indicator light. Field wiring terminals are arranged on the side panel for RTD sensor cable connection. Weak resistance signal traces adopt shielding design to reduce external electromagnetic interference. Constant current source components are arranged with heat isolation structure to reduce thermal drift.
Working Principle The module outputs stable constant current to each RTD sensor. The resistance value of RTD changes along with medium temperature, generating corresponding voltage signal. The high-precision ADC converts the voltage signal into digital value. The FPGA chip executes wire resistance compensation and RTD characteristic linearization calculation, converting raw resistance data into standard temperature reading. It sends temperature data and channel health status to the rack IOP processor through backplane bus. It records open-circuit, short-circuit and over-range fault events with time stamp.
Installation Requirements Insert the module vertically into the dedicated analog I/O slot of UCN rack and tighten front panel fixing screws. Connect RTD sensor cables to the corresponding terminal ports following wiring mode marking. Adopt shielded twisted pair cables for field RTD wiring and single-point grounding of shielding layer. Download channel configuration, RTD type and wiring mode parameters from Control Builder software after power on. Verify temperature reading accuracy and zero fault alarm on the HPM diagnostic screen.
Precautions Release static electricity before plugging the module to protect high-precision analog circuit. 2-wire wiring mode brings larger wire resistance error, 4-wire mode achieves highest measurement precision. Do not route RTD cables alongside high-power AC cables to avoid inductive interference. Long field cables require regular calibration of wire resistance compensation parameters. The module cannot accept thermocouple millivolt signals, it is designed exclusively for RTD resistance measurement.
