Merlin RSTH Temperature & Humidity Monitor

Description

The RSTH Temperature Sensors & Humidity Room Sensors, designed to be used across residential, public, commercial, and light industrial settings.  These sensors offer digital RS485 Bacnet MS/TP, Modbus RTU & analog outputs. Various thermistor outputs available.
  • Versatile Outputs: Delivering 2x 0-10V analog signals for Temperature (°C or °F), and Humidity (% Relative), alongside digital RS-485 communication supporting Modbus RTU or BACnet MS/TP protocols.
  • Robust Construction: Designed for straightforward wall mounting with a 1/2” DIA rear entry and snap-offs for side trunking, encased in a durable ABS UL Flame retardant housing, assuring longevity and safety in diverse environments.
  • Flexible Power Options: Compatible with 12-24V AC/DC or 230VAC electrical systems.
  • Optimal Performance: Exhibiting rapid response times, quick warm-up periods, and excellent long-term stability, with minimal interference, guaranteeing accurate readings and consistent operation over time.
  • Temperature Monitoring: Offers a normal indication range of 32-122°F, with a swift response time of t63% @ 77°F in approximately 20 seconds, an accuracy of ±0.5° @ 50-113°F, and a resolution of 0.1°.
  • Humidity Sensing: Provides indication across a range of 0-100% RH, with a quick response time of t63% @ 77°F in about 8 seconds, an accuracy of ±2% @ 59-86°F (20-90%RH), and a resolution of 0.1%.
TECHNICAL SPECIFICATION
MECHANICAL ELECTRICAL
Mounting Wall Mounted 24V AC/DC Power Rating 12-24VDC (11-32VDC) / 24VAC (20-27 VAC) 50-60Hz
Entry 1” / 25.4mm DIA Rear Entry 230VAC Power Rating Nominal 230VAC (90-250V AC) 50-60Hz
Size (W x H x D) 86 x 114 x 35mm (Low Profile RS – 86 x 114 x 25mm) Internal Fuse Resettable PPTC 240VAC, 400mA
Weight (Max) 0.164Kg max Communication 127 units max
Enclosure ABS UL Flame retardant – IP40 Power Consumption Max 2.5W
ENVIRONMENTAL I/Os
Operating Temperature -10 to 50°C Analog Outputs 3x Linear 0-10V/2-10V CO2, Temperature & Humidity, Thermistor (10K3)
Storage 10-30°C / 0 to 95% RH Digital Networks BACnet MS/TP / MODBUS RTU (Parity: None Data bit: 8bit Stop bit: 1)
Humidity 0 to 95% RH (continuous) non-condensing Relay Outputs 1x SPST 70mA, 30V
Atmospheric Pressure 80 to 110Pa Thermistor 10K3A1B (Alternative thermistors available)
Altitude <2000m
Installation Cat (230V) II (Class 2) Pollution Degree 2
Installation Cat (24V) III (Class 3) Pollution Degree 2
CABLE SPEC USER INTERFACE
Power 1.0 – 2.5mm² max Language English
Analog Output 1.0 – 2.5mm² max Optional Display 2.8” TFT
Digital Output 1.0 – 2.5 mm² twisted pair + ground, shielded cable with 120Ω impedance Optional LED Indication Green: Power (OK)
Yellow: Warning (Pre-Alarm)
Red: Danger (Alarm)
Relays 1.0 – 2.5mm² max
CONFORMANCE
Safety BS 61010-1 (CE / UKCA) Electromagnetic Compatibility BS 50270 (CE / UKCA)
Other (Applied or Considered) IGEM/UP/11, BS 50543

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