Environmental Market

How can a history of rainfall be recorded reliably and economically at remote sites that have no external power supply?

Servicing the gauges at remote weather stations and collecting the data are not trivial pursuits in terms of cost and personnel time. Many weather stations are located in remote sites with no electricity.

Both the Telog R-2107 pulse/event recorder and the R-3303 and R-3307 Telogers can monitor the contact closure of a tipping bucket rain gauge even in the most remote sites.

A tipping bucket rain gauge is commonly used for monitoring rainfall. When filled by precipitation the small bucket tips and causes a relay contact to close. Each relay closure is recorded as an event that is then translated to a certain level of rainfall, e.g., 0.01 inch.

Since Telog's R-2107, R-3303 and R-3307 can work with battery power, there is no need to supply external power at sites. Data can be copied from the R-2107 directly or via a Telog A-203 data transfer unit. Data retrieval in the R-3303 and R-3307 Telogers can be direct or via modem. All these Telog recorders works with easy-to-use software so that compiling reports and data summaries is simple.

The amount of precipitation is useful information for individuals who perform ground water monitoring, meteorological studies, or are interested in combined sewer overflow modeling.

Industrial & Process Market

How to increase the reliability and decrease the maintenance cost of flow data recording without replacing existing flow meters?

It is common for a company to bill individual departments for their total or peak use of steam or water. In addition, flow recording is important for inventory control of various industrial gases that may be used in different plant processes. The plant's facilities group monitors these various flows. To compute total flow or to determine peak rates, they often use planimeters to transcribe the analog data of charts. Doing so, however, may be inaccurate. Furthermore, it will require additional time to enter this data onto computer.

The Telog R-2100 Series Recorders include models for recording pulse, linear and/or squared inputs making them ideal for use with turbines, smart transmitters and differential pressure devices. When set to collect hourly averages, a R-2100 Series Recorder would take over 260 days to fill its memory. The R-2100 Flow Recorders have flow totalizers to complement the rate profiles they generate. Data may be collected with the A-203 Data Transfer Unit for later transfer to a computer.

Water Utilities Market

Is there a Telog solution to the billing and operational information needs of waste water municipalities?

With the soaring cost of new construction, many small municipalities cannot afford to build waste water treatment facilities of their own. Consequently, they use the contractual services of neighboring municipalities to process their effluents.

In accepting the waste water of the contracting municipalities, the processing organizations require a variety of information. For billing purposes, they must know the total number of gallons to be processed. They also require historical data of flow rates to anticipate and to control waste flow so they can avoid exceeding capacity.

Waste water is channeled to the processing plants through elaborate sewer systems. At strategic points, open channel flow meters are located to measure the incoming flow.

With the Telog R-3000 Data Acquisition and Communication System, circular chart recorders are replaced with solid-state reliability and accuracy. The R-3000 eliminates the need to visit a site to replace pen and paper or to gather data. This translates into immediate savings in overhead costs. The R-3000 uses a built-in modem to send data automatically to a central computer via common voice-grade telephone lines. At the computer, numeric as well as graphic reports can be generated. The R-3000 even has an accumulator to calculate flow totals from analog signals. Computer data reduction guarantees that the data provided will not change no matter who reads it.



How to increase the reliability and decrease the maintenance cost of flow data recording without replacing existing flow meters?


It is common for a company to bill individual departments for their total or peak use of steam or water. In addition, flow recording is important for inventory control of various industrial gases that may be used in different plant processes. The plant's facilities group monitors these various flows. To compute total flow or to determine peak rates, they often use planimeters to transcribe the analog data of charts. Doing so, however, may be inaccurate. Furthermore, it will require additional time to enter this data onto computer.

The Telog R-3000 series Telogers include channels for recording pulse and/or linear inputs making them ideal for use with turbines, smart transmitters and differential pressure devices. When set to collect hourly averages, a R-3000 series Teloger would take over 375 days to fill its memory. As a flow recorder the Teloger has flow totalizers to complement the rate profiles it generates. Data may be collected with a portable computer or via modem for reporting and analysis.

Power Utilties Market

How to predict the useful life of compressors in a power substation?

When did the compressor start and stop? What was its cumulative run-time? These are questions often asked by the power utility maintenance engineer since preventive maintenance saves money.

Predicting the useful life of a compressor is not a trivial matter, especially when it is used infrequently. In a power substation, a compressor is used to maintain the optimum gas pressure in gas-charged circuit breakers.

The breakers are used by many power utilities to contain large power surges. The gas in the breakers is held at pressures above 200 psi and is released instantaneously when the breaker opens. Should the gas pressure at the breaker drop, the compressor will automatically turn on. The gas limits the magnitude of the arc across the breaker contacts. This in turn prevents the growth of weld spots on the contacts themselves and lengthens their life.

The Telog R-2107 Pulse/Event/Run Time Recorder is perfect for this type of application. When connected across a relay on the compressor, the R-2107 records the exact date and time that the compressor starts and stops as well as the total time that it was on and running. The start/stop times provide frequency information on the compressor. Constant activity may indicate a gas line leak. The total run time provides preventive maintenance information on the compressor to prevent motor burn-out.


The process of timely data collection and information processing of a paper chart recording system is time-consuming, error-prone and labor-intensive. Is there a better way for substation maintenance groups to check transformer load condition and schedule maintenance and equipment replacement?


In unattended electric utility substations, large numbers of circular chart recorders monitor transformer parameters such as watts, VARs, line voltage, line current, transformer temperature and cooling oil pressure.

With a paper chart system, the utility substation maintenance group sends skilled technicians to substations weekly to collect the charts, employs skilled chart readers to reduce the data to averages by eye, and hires keypunch operators for computer data entry. The information is then used for scheduling maintenance and equipment replacement.

Instead of chart recorders, the utility may use the Telog R-3000 Data Acquisition and Communication System. The R-3000 satisfies two major goals of the utilities today: reducing manpower and equipment costs and obtaining better data on operations. The R-3000 System costs less than circular charts, requires no maintenance, saves manpower in data collection and reduction, and report generation, and provides better data integrity.

The R-3000 Recorder can automatically collect and transfer information from remote substations to a central computer at a fraction of the cost of a conventional circular chart system. It can be connected to the telephone commonly installed in the substation. The R-3000 Recorder will auto-dial the office computer on a regular schedule (e.g. daily, weekly), or under alarm conditions, such as overheating or overloading of transformer. The utility's maintenance group can also call the R-3000 Recorders installed at substations to obtain stored data or current readings.


How to predict the useful life of compressors? When did the compressor start and stop? What was its cumulative run-time? These are questions often asked by the power utility maintenance engineer since preventive maintenance saves money.


Predicting the useful life of a compressor is not a trivial matter, especially when it is used infrequently. In a power substation, a compressor is used to maintain the optimum gas pressure in gas-charged circuit breakers.

The breakers are used by many power utilities to contain large power surges. The gas in the breakers is held at pressures above 200 psi and is released instantaneously when the breaker opens. Should the gas pressure at the breaker drop, the compressor will automatically turn on. The gas limits the magnitude of the arc across the breaker contacts. This in turn prevents the growth of weld spots on the contacts themselves and lengthens their life.

The Telog R-3303 and R-3307 Telogers are perfect for this type of application. When connected across a relay on the compressor, a Teloger's digital channel records the exact date and time that the compressor starts and stops as well as the total time that it was on and running. The start/stop times provide frequency information on the compressor. Constant activity may indicate a gas line leak. The total run time provides preventive maintenance information on the compressor to prevent motor burn-out.


What is the most reliable and economical means of measuring power substation battery status?


Every electric utility substation has a station battery system held in reserve as emergency back-up power. This very important system provides DC power to operate the protective relay equipment should all else fail. Monitoring this system is an ongoing task.

Telog’s R-3000 series Teloger analog channels are perfectly suited to monitoring the ready voltage of the station battery. Various operating voltages are used in station batteries. The most common voltages are 50 and 120 Vdc, but some lower values are also found. Since 20 Vdc is the maximum input for a Teloger, a simple voltage divider should be used to step down the higher station battery voltage being recorded. This divider can be a potentiometer or a resistor network. Since the input impedance of a Teloger is 2 megohms, a voltage divider with sufficiently high impedance to limit current draw from the battery may be conveniently used.

Since Telogers operate on their own battery power, a station battery can be monitored through all operating conditions, providing valuable records of both the system stand-by status and its performance during emergency conditions. A Teloger storing average battery voltage every four hours can operate unattended for over a year before overwriting older data or requiring a new battery. In addition, the alarm feature of a R-3000 series Teloger can signal whenever the stand-by voltage drops below the safety limit.

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