Foxboro RH916RB Dual-Input Panel-Mount Recorder with RS-485

Product Name: Foxboro RH916RB Dual-Input Panel-Mount Recorder with RS-485

Product Series: Foxboro RH900 Series — Recording Indicators

Product Introduction:
The RH916RB is a 96 x 96 mm dual-input panel-mount indicator with built-in trend recording and RS-485 communication. Unlike the RH916MZ, the RH916RB emphasizes data logging capability with extended memory for trend recording. It displays two process variables on dual 6-digit LED lines and stores timestamped trend data in non-volatile memory.

Category:
Description

Technical Specifications:

  • Input Channels2 universal inputs (independent configuration)
  • Input Types: Thermocouple (J, K, T, E, S, R, B); RTD (Pt100, Pt1000, Cu50, Cu100); 4–20 mA; 0–10 V; 1–5 V
  • Display: Dual-line 6-digit red LED, 14 mm digits
  • Recording Memory: 8000 data points per channel with date/time stamp
  • Recording Interval: 1 second to 60 seconds (user-configurable)
  • Communication: RS-485, Modbus RTU, 9600–38400 baud
  • Alarm Outputs2 SPDT relays per channel, 250 V AC / 30 V DC, 3 A
  • Retransmission: Isolated 4–20 mA per channel
  • 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 RatingIP65 front panel
  • Dimensions: 96 mm x 96 mm x 92 mm (W x H x D)
  • Cutout Size: 92 mm x 92 mm
  • Weight: Approximately 450 grams

Functional Features:

  • Extended Trend Recording: 8000 points per channel with full date and time stamp
  • Dual Display: Simultaneous real-time display of both channels
  • Data Download: Trend data downloadable via RS-485 Modbus to host system
  • Alarm with Latching: Relays latch in alarm state until manually reset
  • Max/Min/Avg: Per-channel statistical display

Material Composition:

  • Front Bezel: Flame-retardant ABS, matte black
  • HousingPolycarbonate (Lexan), IP65 gasket seal
  • Display WindowOptical-grade polycarbonate, anti-reflective
  • Terminals: Phosphor bronze, nickel-plated screw terminals

Structural Characteristics:

  • Form Factor: 96 x 96 mm panel-mount (1/4 DIN)
  • Keypad: 6-button membrane with channel toggle and menu navigation
  • Communication Connector: RJ-11 modular jack, rear-mounted
  • Memory Type: Non-volatile EEPROM — data retained during power loss

Working Principle:
Each channel’s signal is digitized by a dedicated 24-bit ADC. The microcontroller applies range-specific linearization and stores the value in EEPROM at the configured recording interval along with a real-time clock timestamp. The current value is displayed on the LED. The RS-485 interface responds to Modbus function codes to read current values, alarm status, and download recorded trend data. Alarm comparators drive SPDT relays independently per channel.

Advantages / Highlights:

  • 8000-point non-volatile memory provides extensive trend history without external recorder
  • Dual-channel recording captures two process variables simultaneously
  • Modbus RTU enables direct integration with Foxboro I/A and third-party DCS/SCADA
  • Latching alarms ensure alarm conditions are not missed during transient events
  • IP65 front panel suitable for washdown and outdoor panel applications

Applicable Industries:

  • Oil and Gas (production, refining, transportation)
  • Chemical Processing
  • Power Plants (thermal, hydro, nuclear)
  • Pharmaceutical Manufacturing
  • Food and Beverage

Installation Requirements:

  • Cut 92 mm x 92 mm panel opening
  • Mount with snap-in clips and IP65 gasket
  • Wire Ch1 input to Ch1 terminals, Ch2 input to Ch2 terminals
  • Connect RS-485 to A, B, GND — use shielded twisted pair cable
  • Provide 85–265 V AC or 24 V DC power
  • Set Modbus address via DIP switches (default address typically 1)
  • Install 120 Ω termination at bus endpoints

Usage Precautions:

  • Do not power cycle during trend recording — may corrupt EEPROM data
  • Verify recording interval matches application requirements (shorter interval = faster memory fill)
  • Maximum 8000 points per channel — configure recording interval accordingly
  • Do not apply > 50 V DC to mA/V input terminals
  • Cold junction compensation is automatic — do not disconnect CJC sensor
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