Trumeter | Innovation by Design
Trumeter | Innovation by Design


Rate Meter & Process Time Indicator


5 digit rate meter and process time indicator.


  • 14.2mm character high visibility LED display.
  • 1/8 DIN (96mmx48mm) bezel.
  • Fully programmable.
  • Programmable display update time 0.1 to 99.9 seconds.
  • Display scaleable to show engineering units.
  • (TAU) process time indication.
  • Programme lock out facility.
  • AC and DC powered models available.
  • Analogue re transmission option.
  • Dual relay output option.
  • RS485 communications option.
  • CE approved. (UL and cUL pending).

Suitable for a wide range of pulse inputs such as magnetic pick-ups, proximity sensors, photoelectric sensors and flowmeters. The 877X is a versatile unit suitable for many speed or process time indication and control applications.

PDF Instructions

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Power Supply

AC Powered 85-265VAC 47-63Hz 20VA
DC Powered 9-30VDC 12VA

Sensor supply

12VDC ± 12% 75mA max


14.2 mm character high visibility LED Display

Signal Input

Sink or Source DIP switch selectable


High 3.5 to 28VDC
Low 0-1.9VDC for single ended signals

Magnetic pick up range

200mV pk-pk to 65VRMS into 34.9 kΩ load

Frequency response contact closure

200Hz max, electronic signals 10kHz max (5V signals) dip switch selectable

Programme enable input

Sink only (4.75kΩ to +5VDC) Internal load


High 3.5 to 28VDC
Low 0-1.9VDC

Response time

25msecs max (5V signal)


Relay output
2 SPCO (Form C) relays
Contact ratings 5A 250VAC or 30VDC @ unity power factor

Data Retention

EEPROM 100years duration

Operating Temperature

0°C to 50°C

Storage Temperature

-20°C to 70°C


0 to 85%RH non condensing


2.5g’s 30-200Hz



Front Panel Protection

IP65 when properly mounted using gasket supplied


CE approved. (UL and cUL pending)

Ordering Information

8770 DC Powered Ratemeter / Process Time Indicator
8771 AC Powered Ratemeter / Process Time Indicator

Options – (Select & add to code 8770-?)

0 for No Options
1 for Dual Relay
2 for Analogue Output
3 for Dual Relay & Analogue Output
5 for Dual Relay & RS485 Comms
7 for Dual Relay, Analogue Output & RS485 Comms

e.g. 8770-1 = DC Ratemeter / Process Timer with Dual Relay Option Board Fitted

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