CT7310-D Economical 2 Channel Circular Process Recorder

Supported Applications

The Omega CT7300 Series is an economical, microprocessor-based circular process recorder designed to measure and record up to two process variables on a standard 10-inch (254 mm) chart. The series supports recording applications requiring inputs from thermocouples (Types J, K, T, R, B, S), RTDs (Pt100 DIN), or linear signals including 4-20 mA and 0-5 Vdc.

Operating Conditions & Performance

The CT7300 Series operates within an ambient temperature range of 0 to 60°C (32 to 140°F) with a humidity rating of 0 to 90% RH non-condensing. Storage temperatures are rated from -40 to 65°C (-40 to 149°F). The unit is powered by 110/220 Vac, 50/60 Hz and includes battery backup for up to 48 hours of recording during power loss.

Performance specifications include a recording accuracy of ±0.5% of span (for a 100-division span) and cold junction accuracy of ±0.2°C/°F @ 25°C (77°F). Ambient error is specified as ±0.01% span/°C from 25°C ambient. The full-scale pen response time to sensor break is less than 10 seconds.

Input ranges supported by the series include:

• Type J: -130°C to 760°C (-202°F to 1400°F)
• Type K: -130°C to 1370°C (-202°F to 2498°F)
• Type T: -200°C to 400°C (-328°F to 752°F)
• Type B: 100°C to 1824°C (212°F to 3315°F)
• Type R: 0°C to 1650°C (32°F to 3002°F)
• Type S: 0°C to 1640°C (32°F to 3000°F)
• Pt100 (DIN): -210°C to 440°C (-346°F to 824°F)
• Linear: 4 to 20 mA and 0 to 5 Vdc

Configuration Options

The series is available in three primary configurations based on alarm relay integration:

• CT7310: Dual Pen Recorder without alarms.
• CT7311: Dual Pen Recorder with Alarm Relay for Pen 1.
• CT7312: Dual Pen Recorder with Alarm Relays for both Pen 1 and Pen 2.

Housing options include a standard NEMA 12X enclosure or an optional NEMA 4 (IP65) rated case, specified by adding "-NEMA" to the model number. An optional LED display indication is available for models with the suffix "-D".

Alarm relays are programmable for process, band, non-latching, or latching operation. The relay output is DPDT, 1.0 A @ 120 Vac resistive, with hysteresis set at 2 units and safe-sided activation. Error protection includes de-energization during sensor break.

Additional features include built-in chart lights for visibility in low-light conditions and a magnetic hub for easy paper replacement. The unit dimensions are 356 H x 356 W x 97 mm D (14 x 14 x 4") with a weight of 3 kg (7 lb).

Key Product Differences

The CT7300 Series distinguishes itself through configurable alarm capabilities and enclosure ratings. The base model, CT7310, provides dual-pen recording without relay outputs. Models CT7311 and CT7312 add programmable DPDT relays for one or two channels respectively.

Enclosure variations allow selection between the standard NEMA 12X rating and a more robust NEMA 4 (IP65) option, which is added to the model number as "-NEMA". The optional LED display suffix "-D" provides digital indication alongside the analog chart recording.

Replacement parts include red pens (P/N CT7300-RED), green pens (P/N CT7300-GREEN), and standard circular charts (P/N CT7000C series). Custom range paper is available via P/N CT7000C-CUSTOM.