The Adjustable Transmitter is a device used in an analog current loop to test a 4-20mA Input, calibrate or demo equipment. The 4-20mA Current Simulator is a current simulator/loop simulator, which simulates an analog field device such as a Pressure Transducer or Temperature Transmitter. When placed in the analog current loop, the loop powered 4-20mA simulator regulates the current in the loop to the setting on the knob from 4 to 20 mA. When a more precise setting is required, place an ammeter in the current loop to display the loop current.
The BOAC is a device that performs the various task required to manage a 12VDC alarm system that has an alarm strobe light and horn that must be powered by a 12V backup battery. The BOAC charges the backup battery, provides a Power Loss Alarm (when required), has a repeat cycle timer for the horn, a system push-to-test button and indication of the battery charging mode.
During an alarm condition the alarm strobe light and horn are powered by the battery. After an alarm condition and with 120VAC applied/restored, the BOAC will recharge the 12V backup battery. During an alarm condition battery power is conserved by operating the horn intermittently, on for 2 seconds, and then off for 2 seconds.
Upon closure of an alarm contact across pins 3 and 10 the strobe light and horn will be activated. Also, upon the loss of 120VAC power, the Power Loss Alarm (if enabled) will activate the strobe light and horn. The Power Loss Alarm may be enabled/disabled by setting the Power Loss Alarm Mode switch to the desired setting.
The push-to-test button is provided to verify system operation. When pushed, the battery charger is turned off so that the strobe light and horn may be powered solely by the battery during the test.
The BOAC utilizes a battery Charge Controller IC chip that was specifically designed to manage the charging of sealed lead-acid batteries. This chip carefully controls the charging current and voltage during the charging process to maximize battery capacity and life. The Charge Controller has two charging modes, “Cyclic Charging” and “Float Charging”. During an alarm event, the strobe light and horn will slowly run down the battery. As long as the battery voltage stays above 12.1V (50% charged), the Charge Controller will stay in the Float Charging Mode. In the Float Charging Mode, the battery will be recharged to 13.6V ± 1% @ 25°C, when the alarm clears. If the alarm where to be turned on often enough (or stay on long enough) to run the battery down below 12.1V (50% charged), the Charge Controller will toggle into the Cyclic Charging Mode and recharge the battery to 14.6V ±1% @ 25°C. After a period of time in the Cyclic Charging Mode with no alarm events, the charging current will drop below 25 mA, and the Charge Controller toggles back to the Float Charging Mode. Battery manufacturers typically recommend this dual voltage charging regiment to ensure the optimum capacity and life of their batteries. To accommodate lead-acid battery chemistry, the Charge Controller also adjusts the charging voltage to account for changes in the ambient temperature (-20.7mV/C° or -11.5mV/F°).
Pump Monitor Relay PMR1
The Pump Monitoring Relay (PMR1) performs both Motor Over-Temperature and Pump Seal Leakage Monitoring in one unit. The Seal Fail Relay is powered by 120VAC, with relay contacts rated for 8 Amps at 120VAC, and comes in a white case with an included socket.
The Over Temperature Relay has two mounting options with standard surface mounting or deadfront mounting so that the deadfront door need not be opened to see the status of the Seal Leakage condition and Pump Over-Temperature, as well as power indication, the Auto/Manual reset select switch, the reset pushbutton, and the adjustment potentiometer.
The Automatic Reset Seal Fail Relay applies a low voltage DC signal to the Motor Thermal Sensor to check its status, and uses a low voltage AC signal to measure the resistance between a single (or dual) Leakage Probe(s) and the grounded motor housing, or between two Leakage Probes to check for the Seal Leakage condition.
Pump Monitor Relay PMR2
The PMR2 is a direct replacement for Xylem-Flygt MiniCas product part numbers 14-407129, 14-407113, 835848, and 835857 and works with pumps using FLS and CLS sensors. The PMR2 performs both Motor Over-Temperature and Seal Leakage Monitoring in one unit, can be powered by 120VAC, 24VAC, or 24VDC, has relay contacts rated for 8 Amps at 120VAC, and comes in a blue case.
The PMR2 is deadfront mountable so that the deadfront door need not be opened to see the status of the Seal Leakage condition and Pump Over-Temperature, as well as power indication, the Auto/Manual reset select switch, and the reset pushbutton.
The PMR2 applies 12 VDC to the sensor and measures the current flow through the sensor. The sensor controls the current in the circuit. If the sensor current is in the normal range the Temperature Alarm Relay is energized to allow normal pump operation. If the sensor circuit becomes shorted, the 12 VDC is turned off and all LEDs flash. With the sensor current below the Trip Point, the Overtemp Indication is turned on. If the sensor current increases above the Trip Point, the Leakage Indication is turned on.