Foxboro RH917HX High-Accuracy Dual-Input Panel Indicator

Product Name: Foxboro RH917HX High-Accuracy Dual-Input Panel Indicator / Recorder

Product Series: Foxboro RH900 Series — Precision Indicators

Product Introduction:
The RH917HX is a 96 x 96 mm high-accuracy dual-input panel-mount indicator and recorder designed for applications requiring superior measurement accuracy. It features enhanced ADC resolution, tighter accuracy specifications, and extended trend recording memory compared to standard RH900 series models. It accepts all universal input types with HART and RS-485 communication.

Category:
Description

Technical Specifications:

  • Input Channels2 universal inputs (independent, high-accuracy)
  • Input Types: Type J, K, T, E, S, R, B TC; Pt100, Pt1000 RTD; 4–20 mA (HART); 0–10 V; 1–5 V
  • DisplayDual-line 6-digit red LED, 14 mm digits, 200,000 count resolution
  • Accuracy: ±0.05% of span (mA/V); ±0.2% of span (TC/RTD) — superior to standard RH900 series
  • Recording Memory16,000 data points per channel with full date/time stamp
  • Recording Interval: 0.5 s to 60 s (configurable)
  • Communication: HART 7 + RS-485 Modbus RTU
  • Alarm Outputs2 SPDT relays per channel, 250 V AC / 30 V DC, 3 A
  • Retransmission: Isolated 4–20 mA per channel (HART pass-through)
  • Power Supply: 85–265 V AC / 90–300 V DC / 24 V DC
  • Operating Temperature: -10°C to +55°C (+14°F to +131°F)
  • Protection Rating: IP65 front panel
  • Dimensions: 96 mm x 96 mm x 95 mm (W x H x D)
  • Cutout Size: 92 mm x 92 mm
  • Weight: Approximately 480 grams

Functional Features:

  • High-Resolution ADC: 24-bit sigma-delta ADC provides 200,000 count resolution
  • Extended Recording: 16,000 points per channel — double the memory of RH916RB
  • HART + Modbus Dual Communication: Full device diagnostics and DCS integration
  • 4 Latching Alarm Relays: With independent hysteresis per channel
  • Statistical Display: Per-channel Max, Min, Avg, Peak, Valley

Material Composition:

  • Front Bezel: Flame-retardant ABS, precision-molded matte black
  • Housing: Polycarbonate (Lexan), IP65 gasket-sealed
  • Display: High-brightness red LED, optical-grade polycarbonate, anti-reflective
  • Terminals: Phosphor bronze, gold-plated for high-accuracy signal integrity
  • PCB: FR-4 with gold-plated traces on critical signal paths

Structural Characteristics:

  • Form Factor: 96 x 96 mm panel-mount (1/4 DIN)
  • Display Layout: Top line = Channel 1; Bottom line = Channel 2
  • Keypad: 8-button membrane with dedicated HART and recording menu access
  • Connectors: RJ-11 (RS-485), screw terminals (HART), screw terminals (power/I/O)

Working Principle:
The 24-bit sigma-delta ADC samples each input channel at high resolution, providing 200,000 counts for precise measurement. The microcontroller applies per-input-type linearization tables stored in firmware. Values are displayed on the dual LED lines. Every 0.5 seconds (minimum interval), the value is timestamped and stored in 16,000-point EEPROM memory. HART communication decodes diagnostics from field devices; Modbus RTU provides standard DCS communication. Alarm comparators with user-adjustable hysteresis (0.1% to 10% of span) drive the SPDT relays.

Advantages / Highlights:

  • ±0.05% accuracy on mA/V inputs — the highest in the RH900 series
  • 16,000-point trend memory provides the longest recording duration in the series
  • HART communication enables field device diagnostics without removing the transmitter
  • Gold-plated terminals ensure signal integrity for high-accuracy applications
  • IP65 front panel with gasket seal for washdown environments

Applicable Industries:

  • Oil and Gas (custody transfer, fiscal metering)
  • Chemical Processing (precision dosing)
  • Power Generation (boiler control, turbine monitoring)
  • Pharmaceutical (GMP-compliant processes)
  • Semiconductor Manufacturing

Installation Requirements:

  • Cut 92 mm x 92 mm panel opening
  • Mount with IP65 gasket and snap-in clips
  • Use shielded twisted pair cable for all analog and HART connections
  • RS-485: connect A, B, GND; install 120 Ω termination at bus ends
  • Provide 85–265 V AC or 24 V DC power
  • For HART: ensure 250 Ω loop resistor is present in the DCS I/O card
  • Set Modbus address via DIP switches (unique per device on bus)

Usage Precautions:

  • Do not apply > 50 V DC to any mA/V input terminal
  • HART communication requires proper loop resistance (250 Ω) — verify before use
  • Calibration verification recommended every 12 months for ±0.05% accuracy claims
  • Do not open housing during operation — risk of electric shock and accuracy void
  • Recording memory fills at 16,000 points — configure recording interval to match data retention requirements
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