The Adjustable Transmitter is a device used in an analog current loop to test, calibrate or demo equipment. The AT4201 simulates an analog field device such as a Pressure Transducer or Temperature Transmitter. When placed in the analog current loop, the Adjustable Transmitter 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 unit is a solid state device that charges the backup battery used in a 12 V DC alarm system that has an alarm strobelight and horn. The BOAC unit activates the alarm strobe light and horn automatically when there is a loss of 120 V AC power. Upon loss of 120 V AC power, there is a time delay of approximately 5 seconds when switching from the charging circuit to the battery powered alarm circuit. This delay prevents momentary power glitches from causing nuisance alarms. During an alarm with a loss of 120 V AC, the alarm strobe light and horn are powered by the battery. Battery power is conserved by operating the horn intermittently, on for 2 seconds, and then off for 2 seconds. An alarm contact closure across pins 3 and 10 with 120 ...
The Flasher provides a simple means of achieving a 120 V AC alarm flash circuit, without the high cost of a strobelight. The most common application would be flashing an incandescent light bulb. The rate of flash is approximately 30 flashes per minute.
The PS100 is a compact, regulated, linear 24 V DC power supply, capable of supplying up to 100 mA of current. It operates from 120 V AC and has a solid state resettable fuse on its output. The 24 V DC output is transient protected. The PS100 plugs into a 12 pin base, allowing fast installation and easy servicing.
Operation The Pump Monitor Relay provides Motor Over Temperature and Seal Leakage alarms for Submersible Pumps.
Motor Over Temperature Alarm - The Pump Monitor Relay applies a low voltage DC signal to the Motor Thermal Sensor to check its status. If the Pump Monitor Relay detects that the Motor Thermal Sensor contacts are closed (normal condition), the Overtemp indicator remains off, and the Overtemp Relay is energized, closing the contacts between terminals 2 and 11.
When the Motor Thermal Sensor contacts open (Over Temperature condition), the Overtemp Indicator is turned on and the Overtemp Alarm Relay is de-energized, opening the contacts between terminals 2 and 11, and closing the contacts between terminals 2 and 1.
When the Over Temperature condition has cleared, the Pump Monitor Relay will reset based upon the position of Alarm Reset Mode Select Switch (Auto or Manual). When in the Auto position, the Overtemp Alarm resets automatically. When the switch is in the Manual position, the Overtemp Reset Push-button must be pushed for approximately 1.5 seconds to clear the alarm.
Seal Leakage Alarm - The Pump Monitor Relay detects moisture inside a pump motor by using a low voltage AC signal to measure the resistance across Leakage Probes #1 and #2, or between the Leakage Probe(s) and the grounded motor housing. A Seal Leakage condition is considered present when the amount of moisture in the motor causes the resistance between terminals 6 and 5 to drop below the setting of the potentiometer. When this occurs, the Pump Monitor Relay turns on the Leakage Indicator and energizes the Leakage Alarm Relay, closing the contacts between terminals 9 and 10.
The alarm trip point may be set by the following procedure: Isolate the
Leakage Probe from terminal 6. Connect a resistor with the desired trip value across terminals 5 and 6. Slowly adjust the potentiometer to the point where the alarm turns on. Remove the resistor and reconnect the Leakage Probe(s) to terminal 6.
