The Series PM-RM 1/8 DIN True RMS Meters, with Jumper-Selectable AC Signal Input Ranges are designed for process automation applications. The line is a versatile family of controls with a multitude of input and output selections. PM’s are fully scalable for customizing to the exact application requirements allowing the display to read in desired engineering units, ideal when using current and voltage signal transformers. Current input models can be set to one of 4 input ranges from 2.0000 mA with 0.1 μA resolution to 5.000 A with 1 mA resolution. The voltage input models may be set to one of 6 input ranges from 200.00 V with 10 μV resolution to 600.0 V with 0.1 V resolution. Universal AC or DC power options enable flexibility with usage in various power situations. The PM-RM’s offer optional 8 A contact or 120 mA solid state relay outputs, plus an analog process signal output with 4 user-selectable current or voltage ranges. To provide a higher level of communication and integration into a system’s network, several communication protocols such as RS-232, RS-485 and even USB options are available.

The PM-RM True RMS Meters are ideal for AC loads found in applications like electrical motors which will only operate properly if the AC line voltage and frequency are within the motor’s specified tolerances. If the thresholds specified by the motor manufacturer are exceeded, permanent damage to the motor as well as plant equipment could occur. Drops in line voltage or frequency may indicate an excessive load and the possibility of equipment malfunction. In these situations, the PM-RM meters are a simple means to monitor AC power lines and provide an alarm of non-compliance.

Parameter Name	Parameter Value
Measured value	current, voltage
Display	5-digit
Type	panel-mount
Other characteristics	RS-485 RS-232 analog input