Current and Voltage Alarms February 2001 Affordable Alarm Trip The ECA DIN-style Alarm features a solid metal housing that stands up to the continual rigors of process control and factory automation applications. Rugged and reliable, the 4-wire (line-powered) ECA is the low-cost solution when alarm trip outputs are needed to indicate high or low process conditions. Available models accept current and voltage input from field transmitters, transducers, and other process instruments. When the input falls outside of a pre-set limit (user configurable), the ECA provides contact closure outputs ideal for indicating a high and/or low condition via a bell, buzzer, light or other annunciating device. Configurable Dual Alarms—The ECA is offered in a wide variety of dual alarm models. Choose any combination of high or low, failsafe or non-failsafe alarms, and the ECA will be factory-set for you. Internal jumpers allow for changes after it arrives at your plant. Figure 1. ECA-DIN dimensions. 40mm (1.57 in) Compact durable aluminum housing snaps quickly and securely onto standard G-type and Top Hat rails. Features • Independently configurable dual alarms. Individually field-configure the ECA’s dual alarms to low/low, high/high, low/high, or high/low output, and failsafe or non-failsafe trip operation. • Wide range of input options. Available models accept common ac and dc input types. • RFI/EMI Protection. The ECA provides an effective barrier against the unpredictable, harmful effects of radio frequency and electromagnetic interference. TRIP B DEAD BAND TX • Fully-adjustable trip point. A potentiometer on the front panel will allow quick selection of trip point values from 0-110% of input span. 138.2mm (5.44 in) When Installed • LED provides alarm indication. The ECA’s LED clearly indicates when the alarm trip changes from normal mode to alarm mode. Figure 2. The ECA comes equipped with two alarm outputs, and will power a transmitter using the –TX option. DUAL ALARM DEAD BAND

Current and Voltage Alarms Specifications Performance Repeatability: Trip point repeats within ±0.1% of full scale Stability: Trip point within ±0.2% of span per year Burden: 4-20mA is 1V, max; 0-5A is 0.01V, max Power Consumption: 1.5W, typical; 2.5W, typical with –TX option; 3.5W max, with –TX option Deadband: 1-20% of span standard (see -AD100 option for 1-100% deadband range) Alarm Response: 50 msec for a step change of 10-90% beyond trip point(s) Performance Line Voltage Effect: 0.005% (Continued) per 10% line change Isolation: 1500Vrms between input, output and power Maximum Input Overrange:...