SKF Machine Condition Transmitters (MCT) CMSS 570(A) Series Temperature/Monitor www.skf.com/reliability 9 CMSS 570(A) Series Temperature Transmitter/Monitor Introduction The CMSS 570(A) Series are solid state temperature transmitters/ monitors. They can be used with solid-state temperature sensor or dual output vibration/temperature sensor that provides a 10 mV/K output. The input signal is processed to provide temperature in degrees F or C. The output is a standard 4-20 mA current proportional to this temperature, within the specified full-scale range of 0-250 Degrees F. The 4-20 mA output is suitable for direct connection to a Programmable Logic Controller (PLC) or Distributed Control System (DCS). Buffered Output A BNC connector mounted on the front of the unit provides buffered access to a 0-5 Vdc temperature proportional signal that can be read with a standard voltmeter or data analyzer (Microlog). Fault Detection On board fault detection circuitry continuously monitors the transducer for normal operation. If a fault occurs, the output current is reduced to 2 mA to indicate the fault to the readout system. A red LED on the front of the unit is turned on to provide a local indication of the fault. Alarms This monitoring option adds two independent set points, with LED alarm indicators and output relay contacts (Alert and Danger). Set points are adjustable via potentiometer, from 0 to 110% of full scale. Each has an adjustable delay of 1 to 10 seconds. Relay contacts can be independently configured by the user for either Normally Open (NO) (Standard) or Normally Closed (NC) operation. Relays are normally de-energized and can be configured for latching or non-latching (standard) operation. Latched alarms may be reset locally or by remote contact closure. SPST (Single Pole Double Throw) Relay contacts are rated 5 Amps at 30 Vdc or 125 Vac for resistive loads. The Alarm option also provides set point multiplication of 3x via contact closure (2x available). Displays and Assemblies Various display options, NEMA and explosion-proof enclosures, and assembled multi-channel systems are available. Consult your SKF Reliability Systems Sales Representative. Specifications POWER REQUIREMENTS Supply Voltage: +24 V DC (23 V to 28 V). Reverse polarity and transient protection included. Supply Current: CMSS 570 – 55 mA CMSS 570A – 110 mA Total Power: 3.1 W maximum External Fuse: F250 mA/250 V Relay Ratings: Switching Voltage: 30 V DC maximum or 125 V AC Switching Current: 5 A maximum INPUT Sensor: CMSS 793T-3, CMSS 797T-1 Sensors Sensor Sensitivity: 10 mV/K OUTPUT Buffered Acceleration Output: BNC Connector, Screw terminal Sensitivity: Depending on used sensor input sensitivity, ± 10% 4-20 mA DC Output: 4-20 mA proportional to the full-scale range Accuracy: 0.5% of full-scale range ENVIRONMENTAL Operating Temperature: -4 °F to +176 °F (-20 °C to +80 °C) Storage Temperature: -67 °F to +257 °F (-55 °C to +125 °C) Relative Humidity: 0-95% Relative Humidity Non-Condensing MECHANICAL Weight: 6.0 Ounces (170 Grams) Enclosure: Thermoplast ABS Color: Black, with gray front panel Connectors: 12-pole screw terminal, 2 BNC’s and two 6-pole pluggable connectors. Mounting: 32 mm (G style) or 35 mm (T style) DIN-Rail Dimensions: Length: 3.11 inches (79 mm) Base: 1.80 inches (46 mm) Height: 3.95 inches (100 mm) The Machine Condition Transmitter (MCT) CMSS 570(A) Series Temperature Transmitter/Monitor available as a Basic Model (pictured at left) or as a stand-alone Monitor (right). Ordering Information • CMSS570A Temperature Transmitter with Monitor, Input CMSS 793T-3 or CMSS 797T-1, Full scale set to +250 °F • CMSS570 Temperature Transmitter, Input CMSS 793T-3 or CMSS 797T1, Full scale set to +250 °F NOTES: 1. The full-scale option specified at order entry is used by the factory for initial calibration. However, several other ranges can be jumper selected in the field. Full-scale values: 0 to +250 °F. Corresponding full-scale values: -17.8 °C to +121.0 °C. 2. Transducer and full-scale options not listed are available. Contact your SKF Reliability Systems Sales Representative.