CPA - PC-Programmable Alarm (4-Wire)
8Pages

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips June 2009 The universal CPA PC-Programmable Alarms provide on/off control, warn of unwanted process conditions, and provide emergency shutdown. Very economical, they accept a direct signal input from transmitters, temperature sensors, and a wide array of other monitoring and control devices: • Current and Voltage Signals • 23 RTD Types • 9 Thermocouple Types • Resistance and Potentiometer Devices • Direct Millivolt Sources Single or Dual Alarm Trip Outputs The 4-wire (line/mains-powered) CPA provides one or two alarm relay outputs when a monitored process variable falls outside of user-set high and/or low limits. This is typically used to activate a warning light, annunciator, bell, or shutdown system. Figure 1. Available CPA models deliver versatile and programmable input and output choices. Programmable Input mA V RTD T/C ohms mV COMPUTER PROGRAMMABLE ALARM INPUT READY ALARM 1 ALARM 2 Programmable Output Single Relay Dual Relay (Trip Points, High Alarm, Low Alarm, Failsafe, Non-Failsafe, Normally Open, Normally Closed) Analog Output (optional) The CPA PC-Programmable Alarm features a metal, RFI resistant housing that snaps onto standard DIN-style rails. • Universal plant standard. There’s no need to stock dozens of different fixed range alarm trips. • 20-bit input resolution. Delivers industrybest digital accuracy for both sensor (RTD and thermocouple) and analog (current/voltage) inputs. • PC-programmable with Windows® software. From a single screen, you can choose, and then view to confirm, all of your application specific operating parameters from a PC. • Long-term stability. Provides up to 5 years between scheduled calibrations. • Combined alarm trip and transmitter. The analog output (-AO) option reduces costs and installation time when both alarm and transmitter functions are needed at the same location. • Isolated and RFI/EMI protection. Delivers superior protection against the effects of ground loops and plant noise, and radio frequency and electromagnetic interference. Certifications* CE Conformant – EMC Directive 89/336/EEC EN 61326; Low Voltage Directive 73/23/EEC EN 61010

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips All operating parameters configure quickly and easily using our Intelligent PC Configuration Software. Programmable functions include: • Input type and measurement range (zero and full scale values) • Input and output trimming • High or low alarm(s) with trip points • Failsafe or non-failsafe and normally open or normally closed alarm relays • Alarm deadband (0-100%) and alarm time • T/C reference junction compensation (on/off) • Standard and custom linearization curves Figure 2. The CPA programs quickly from a single...

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Combination Alarm and Isolated Transmitter Figure 5. When ordered with the Analog Output (-AO) option, the CPA is a combination alarm trip and signal transmitter. When ordered with the Analog Output (-AO) option, the CPA provides a proportional and isolated analog retransmission of the input signal that can be sent to remote monitoring/control devices like a DCS, PLC, PC, indicator, or data recorder. All analog parameters can be selected using the CPA Intelligent PC Configuration Software. Upon input failure, the analog...

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Specifications (HLPRG: mA and V Input Model) Performance Alarm Trip Repeatability: Current, ±0.01% of max. span (±2 microamps); Voltage, ±0.01% of max. span (±1mV) Input Accuracy: Current, ±0.01% of max. span (±2 microamps); Voltage, ±0.01% of max. span (±1mV) Overall Accuracy: The overall accuracy of the unit is the combined input and output (if any) accuracies. It includes the combined effects of linearity, hysteresis, repeatability, and adjustment resolution. It does not include ambient temperature effect Minimum...

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Specifications (TPRG: RTD, T/C, Ohm, mV and Pot Input Model) Performance Alarm Trip Repeatability: See Table 4 on Page 6 Input Accuracy: See Table 4 on Page 6 Overall Accuracy: The overall accuracy of the unit is the combined input and output (if any) accuracies. It includes the combined effects of linearity, hysteresis, repeatability, and adjustment resolution. It does not include ambient temperature effect Mimimum Span at Specified Accuracy: See Table 4 on Page 6 Cold Junction Compensation Accuracy (T/C Inputs Only):...

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Table 4. Accuracy with RTD, Thermocouple, Ohms, and Millivolt Inputs (Models with TPRG Input). Input Conformance Range Minimum Span Input Accuracy/Repeatability Maximum Range Direct Resistance

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Ordering Information Unit Input Output Power Options Housing CPA PC-Programmable Limit Alarm Trip HLPRG Programs to accept: Current: Any range between 0-50mA including: 0-20mA 4-20mA 10-50mA Voltage: Any range between 0-10Vdc including: 0-5Vdc 1-5Vdc 0-10Vdc TPRG Programs to accept (see Table 3 on Page 6 for details): 1PRG Single Relay (Relay is double-pole/ double-throw (DPDT, 2 form C, rated 5A@250Vac, 50/60Hz, non-inductive) 2PRG Dual Relays (Relays are single-pole/double-throw (SPDT, 1 form C, rated 5A@250Vac,...

PC-Programmable Current/Voltage and RTD/Thermocouple Limit Alarm Trips Figure 7. Installation Dimensions. 50mm (1.97 in) NOTE: While all CPA models (model with HLPRG input shown) are dimensionally identical, the CPA that accepts temperature inputs (TPRG input) features metal terminal blocks for enhanced cold junction compensation. COMPUTER PROGRAMMABLE ALARM INPUT READY Table 5. Terminal Designations. Top Terminals (Left to Right) Current Input (HLPRG) Voltage Input (HLPRG) RTD, Ohm & Pot Input (TPRG) Bottom Terminals (Left to Right) Single Alarm (DPDT Relay) Dual Alarms (SPDT Relays)...