438D Vibration Switches (mm/sec)
An Economical Machine Monitor with Remote Sensor
More than a simple switch, but not an expensive monitor either, the 438D is a single-channel vibration monitor that can be located in a centralized location, remote from operating equipment. The 438D is on guard around the clock to provide cost-effective protection of motors, pumps, fans and a wide range of other rotating equipment. It provides continuous digital readout of the vibration level, and signals when a predetermined setpoint level is reached.
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Measurement mode |
Velocity |
Frequency range |
Dependent on tranducer type and any special filtering (See “Transducer Types” below) |
Analog output |
4 – 20 mA DC, proportional to full scale range |
Input power |
120V or 240V AC, field selectable |
Setpoints |
2, adjustable from 0-100% of full scale |
Indicators |
LEDs: yellow for “Alarm”, red for “Trip”, green to indicate range |
438D operating temperature |
-20 to +160F (-29 to +71C) |
Enclosure |
NEMA 4, with hinged cover Dimensions: 9.5″H x 7″W x 4″D (24.1 x 17.8 x 10.2cm) |
Mounting |
Flat surface, 8-3/4″ x 4″ (22.2 x 10.2cm) bolt pattern |
Cable entry |
Transducer cable entry and cable grip provided; power and control cable entry by customer. |
Full scale range |
0 – 25 or 0 – 75 mm/sec |
Alarm & trip setpoints |
0 to 100% of full scale range |
Relay time delay |
0 to 20 sec. per relay |
Relay state |
Normally de-energized (open below setpoint) or normally energized (closed below setpoint) |
Relay configuration |
Latching or non-latching |
Relay inhibit |
Inhibits relay operation during start-up or machine maintenance |
Input power |
120V or 240V AC |
4033-400 (Velocity) |
Frequency range: 20 to 1,500 Hz |
4033-500 (Velocity) |
Frequency range: 20 to 1,500 Hz |
4034 (Velocity) |
Frequency range: 12 to 1,000 Hz |
4071A (Acceleration) |
Frequency range: 2.1 to 3,500 Hz |
4073 (Acceleration) |
Frequency range: 0.8 to 10,000 Hz |
