ATI’s Series B14 Receivers are compact electronic modules that provide local alarm, display, and signal retransmission functions for gas detection systems.

The modules are designed to accept input from either two, three, or four wire 4-20 mA transmitters located up to 10,000 feet from the receiver. They’re ideally suited for use with ATI’s Series A12 or B12 two-wire toxic gas transmitters, or Model A12-17 or B12-17 three-wire combustible gas transmitter.

B14 Alarm Receivers are DIN rail mounted modules that can be supplied in single or multiple unit enclosures.  Gas concentrations are indicated directly in PPM, PPB, percent, or percent LEL with the display range selectable by the user.

Each module provides separate caution, warning, and alarm setpoints with LED bar indicators of each alarm point. LED indicators flash on initial alarm condition and change to steady on when the alarm is indicated.  Modules contain individual alarm relays for each alarm setpoint. However, each relay can be assigned to any setpoint to allow multiple alarm functions at a single alarm point. Relays are configurable for either standard or fail-safe operation and for either latching or non-latching operation.  A fourth LED alarm bar and relay are provided to indicate trouble conditions.  The trouble alarm and relay will activate on loss of input signal or if the 4-20 mA input drops below a specific value. 

A gas alarm system shall be supplied for monitoring the concentration of                        (specify gas type) in                                                    (specify location).  The system shall consist of an enclosure containing individual alarm modules for           ___  (specify quantity) points of gas measurement.  The gas alarm system shall be ATI Series B14 or approved equal.  Each complete alarm system shall include a power supply of sufficient size to operate the number of alarm modules required.

Each B14 alarm module shall connected to a gas transmitter located remote from the panel and provide a high intensity digital LED display of gas concentration, plus alarm indicator LED's for Caution, Warning, Alarm, and Trouble. Three programmable alarm setpoints shall be provided for warning personnel of differing levels of leakage. Gas leaks shall be indicated by flashing LED indicators on the alarm module. The concentration of the gas shall be displayed directly in engineering units. Three alarm relays shall be provided for external alarming functions. Each alarm relay shall be independently assignable either to the caution, warning, or alarm setpoint, and shall also be programmable for latching and/or fail-safe operation. Relays shall also be configurable for “Horn Mode” of operation. In this mode, an external horn wired to this relay can be silenced using the front panel A/R pushbutton. In addition, a separate Trouble alarm shall be provided on each module to indicate the loss of signal from the sensor/transmitter. Each receiver shall provide an isolated 4-20 mA output signal proportional to gas concentration, and shall also contain remote reset input terminals to allow alarm acknowledgment from a remote location.

An alarm reset and acknowledge (A/R) pushbutton on the front of each alarm module shall provide the operator interface. In the event of an alarm, the corresponding LED indicator will begin to flash. When the A/R button is pushed, the LED indicator will change from flash to steady on state. This indicates that the alarm has been acknowledged. If the alarm is defined as non-latching, the LED indicator will turn off when the gas concentration falls below the setpoint. If the alarm is defined as latching, the LED will remain on until the A/R button is pressed again to reset the relay and indicator LED. The front panel A/R button shall also allow the operator to put the alarm module into an “Inhibit Mode” of operation, where alarm relays do not function. Alarm modules shall automatically return to normal operation after 4 hours if not manually reset.

Alarm modules shall be powered from DC input voltages from 12-28 VDC. Internally, each module shall provide a 24 VDC power supply to drive external transmitters, with this supply voltage independent of module input voltage.

Alarm modules shall be designed to mount to standard 7.5 x 35 mm DIN rail.  All electrical connections shall be to pluggable terminal blocks, allowing replacement of an alarm module without disconnecting any input or output connections.