PR 5725 Programmable Frequency Indicator

The PR 5725, from PR electronics, measures, scales, and displays frequency signals found in many process speed and flow rate applications. The indicator can measure the period of the frequency, useful for displaying the elapsed time between events. The 5725A is the standard model. The 5725D has two SPDT set point contacts and a 0/4-20 mA output for process control. The display provides IP65 environmental sealing, and additional protection is provided by the optional 8335 splash proof cover.

• measures NPN, PNP, Contact, NAMUR, S0, Tacho, and TTL sensors
• programmable frequency input span of 0.001 Hz to 50 kHz
• 5725D has two SPDT relays and one analog output
• easy to read 4-digit, 14-segment LED display with scrolling help text
• universally powered by 21.6-253 VAC or 19.2-300 VDC

Common Uses of the PR 5725 Frequency Indicator

• the PR 5725 measures, scales, and displays frequency signals in many process speed and flow rate applications
• the indicator can measure the period of the frequency, which is useful for displaying the time elapse between events
• the 5725D has two SPDT set point contacts and a 0/4-20 mA output for process control
• the display provides IP65 environmental sealing, and additional protection is available with the optional 8335 splash proof cover
• measurement of almost any pulse sensor
• speed measurement of many types of machinery
• redundant verification of process automation

Features of PR 5725 Frequency Converter

• 4-digit display with 13.8 mm high, 14-segment LED digits, and adjustable decimal point
• fast response time of 1 cycle + 100 ms, and excellent accuracy of better than 0.05% of selected range
• the analog output current on the 5725D can dampen from 0.1 to 60 seconds and can handle up to 800 Ohms loop load
• the 5725 meets NAMUR NE21 recommendations for high performance in harsh EMC environments
• 2.3 kVAC galvanic isolation between input, output and supply
• excellent signal / noise ratio of > 60 dB

Low Cut-off Filter

The PR 5725 frequency indicator has a selectable low cut-off filter, which sets the display and output to 0% when the frequency measurement is ≤ 0.5 Hz (2 s). This filter allows the display to ignore extremely low frequencies from flow meters and encoders that are sometimes present when the process is at idle.

Fast Analog Output

Users can adjust the analog output response time to a fast 0.1 second, allowing the analog output to track faster changing input signals.

Programmable Display Response Time

Configuration of the response time of the PR 5725 display readout can be independent of the analog output response time. This feature ensures a stable and easy readout of unstable or jittering input signals.

Out of Range Indication at f/I Function

Out of range minimum limit is < 0.0009 Hz / (18 minutes 31 seconds).

• If the In.Lo value is set to “0.0” Hz then the display readout will be “0.0” when reaching the out of range minimum limit.
• If the In.Lo value is set different from “0.0” Hz then the display readout will be flashing “In.Lo” when reaching the out of range minimum limit.

Fast Set Point Adjustment and Relay Test (only on the PR 5725D)

These menus are interactive and allow adjustment of the set points while the display is measuring the input signal. The front LEDs will then indicate when the relays change state, thus easing the set point adjustment in many situations. By activating 1 and 2 simultaneously, a relay test will initiate and the relay will change state. Users can save the set point adjustment by a quick press of 3 button. Holding down 3 for more than 0.5 seconds will return the display to the default state (monitor) without changing the set point.

Frequency Display with Easy Mounting and Programming

• easy to mount 1/8 DIN (48×96 mm) panel meter with IP65 (type 4X) sealing
• suitable for use with marine applications
• fully push-button programmable
• password protected