Foxboro RH101AA Single-Loop Panel Indicator

Technical Specifications:

• Input Types: Type J, K, T, E, S, R, B Thermocouples; Pt100, Pt1000, Cu50, Cu100 RTDs; 0–20 mA, 4–20 mA, 0–10 V, 1–5 V
• Display: Monochrome backlit LCD, 6-digit, 14 mm digit height
• Accuracy: ±0.1% of reading + 1 digit (for mA/V inputs); ±0.5% of span (for TC/RTD inputs)
• Sampling Rate: 2 readings per second (typical)
• Record Memory: 4000 data points with timestamp (date and time)
• Alarm Setpoints: 2 alarm setpoints (Hi and Lo) with relay outputs
• Power Supply: 85–265 V AC / 90–300 V DC / 24 V DC (universal)
• Operating Temperature: 0°C to +55°C (+32°F to +131°F)
• Protection Rating: IP65 front panel (NEMA 4X equivalent when panel-mounted)
• Dimensions: 96 mm x 48 mm x 75 mm (W x H x D)
• Cutout Size: 92 mm x 45 mm

Functional Features:

• Universal Input Acceptance: Accepts all major thermocouple types, RTD types, and standard analog signals
• Trend Recording: Stores up to 4000 timestamped readings in non-volatile memory
• Dual Alarm Outputs: 2 SPDT relay outputs for High and Low alarm conditions
• Peak/Valley Hold: Captures and holds maximum and minimum process values
• Max/Min/Avg Display: Shows statistical process data on demand
• Retransmission: Isolated 4–20 mA retransmission output (optional)

Material Composition:

• Front Bezel: Polycarbonate (Lexan), UV-resistant, flame-retardant UL 94 V-0
• Housing: ABS plastic with IP65 gasket seal
• LCD Cover: Scratch-resistant polycarbonate with anti-glare coating
• Terminal Block: Phosphor bronze, tin-plated

Structural Characteristics:

• Form Factor: 1/8 DIN panel-mount instrument
• Mounting: Panel cutout with snap-in mounting clips
• Weight: Approximately 200 grams
• Display Area: 68 mm x 28 mm visible display window

Working Principle:
The RH101AA receives the process signal via its universal input terminals. The input signal is digitized by a 16-bit ADC and scaled to engineering units using user-configurable range parameters. The processed value is displayed on the LCD. Every 0.5 seconds, the value is stored in non-volatile EEPROM memory with a timestamp. When the process value crosses either alarm setpoint, the corresponding SPDT relay changes state to activate external alarm devices.

Advantages / Highlights:

• Universal input compatibility eliminates need for multiple instrument types
• Non-volatile trend memory retains data during power loss
• Large 14 mm digits for excellent visibility from distance
• IP65 front panel provides protection against washdown environments
• Universal power supply (85–265 V AC) simplifies inventory management

Applicable Industries:

• Food and Beverage Processing
• Pharmaceutical Manufacturing
• HVAC and Building Automation
• Water Treatment
• Light Industrial Process Control

Installation Requirements:

• Cut 92 mm x 45 mm opening in the control panel
• Mount using included snap-in clips from the rear of the panel
• Connect field wiring to screw-clamp terminal block (max 2.5 mm² wire)
• For alarm relay outputs, connect external devices to terminals AL1 and AL2
• Ensure minimum 50 mm clearance behind the panel for wiring access
• Connect power to terminals L and N (AC) or + and – (DC)

Usage Precautions:

• Do not exceed the maximum input voltage of 50 V DC on mV/mA inputs
• For thermocouple inputs, use correct thermocouple extension wire to avoid measurement errors
• Cold junction compensation (CJC) is automatic; do not disable it
• Do not open the housing while powered — risk of electric shock
• Clean the front bezel with damp cloth only; do not use solvents