Omega CT485-RS

The Omega CT485-RS is a microprocessor-controlled chart recorder that simultaneously measures and documents temperature and relative humidity over extended periods. Designed for laboratory, environmental monitoring, and storage facility applications, it combines precision sensor technology with straightforward front-panel programming and dual-threshold alarm capability. The unit accepts plug-in external sensors via a 6-foot extension cable and supports optional 0.02 to 1.20 Vdc signal input with a voltage adapter, enabling integration into multi-parameter monitoring systems.

– Technical Specifications

Measurement Ranges:
• Temperature: −17 to 49°C (2 to 120°F); ±1°C accuracy
• Relative Humidity: 2 to 98% RH
• Sensor response time: 5 minutes for 63% step change
• Solid-state temperature sensor

Recording & Display:
• 8-inch (200 mm) circular linear radial chart; 1, 7, or 32-day recording intervals
• Stepper motor chart drive with magnetic retaining knob
• Disposable fiber-tip pens with motorized linear screw drive
• LCD display shows current temperature and humidity; °C, °F, or %RH selectable

Alarms & Control:
• Independent high/low setpoints for temperature and humidity
• Integral piezoelectric audible alarm
• 1 Amp, 30 Vdc alarm relay (SPST, normally open)

Power & Environmental:
• Four D-cell batteries included; >1 month runtime in 32-day mode
• Optional 9 Vdc, 1 Amp adapter (110 or 220 Vac, 50/60 Hz)
• Operating temperature: 0 to 49°C; 0 to 90% RH non-condensing
• Current draw: 300 mA (battery, pen active); 500 mA (AC adapter, pen active with chart lights)

Physical:
• Charcoal Gray or Computer Room White finish
• Benchtop or wall mounting; rotating stabilizing arm

– Key Features

• Dual independent alarm thresholds prevent manual limit monitoring
• Stepper motor precision eliminates drift common in synchronous drives
• Magnetic chart knob reduces paper damage during changes
• Extended sensor cable accommodates remote placement in confined spaces
• Battery operation supports field deployment without AC infrastructure

– Typical Applications

• Pharmaceutical and laboratory environmental validation
• Warehouse and cold storage condition documentation
• HVAC system performance verification
• Data center climate monitoring

– Compatibility & Integration

External voltage signals (0.02–1.20 Vdc) interface via optional adapter, permitting connection to third-party instrumentation. Alarm relay output (30 Vdc, 1 Amp) drives external control devices, notification systems, or data acquisition interfaces.