FlowCERT

FlowCERT offers a high degree of accuracy on almost any flume or weir construction found worldwide. It features a 32 point curve fit facility for non-standard flumes or weirs should it be required.

• Choice of DUET transducer assembly with high resolution and accuracy in varying climatic conditions or dBMACH3 transducer.
• Optional Speedy Velocity Sensor for applications where no flume or weir (PMD) is present performs a velocity x area calculation to establish flow rate.
• Uses doppler frequency changes to measure liquid velocity when inserted into a channel or pipe.

DUET

DUET is a new concept in ultrasonic measurement featuring two transducers mounted on a common frame, one higher than the other. Both transducers fire together, but the echoes returning from the flow surface are only processed at the lower unit. By constantly monitoring the phase difference between the two transducers, DUET dynamically compensates for any changes in the speed of sound between the transducers and liquid surface.

Conventional transducers compensate for variations in temperature which, while important, is only part of the story. The speed of sound actually varies with air density, which derives primarily from changes in temperature. DUET is unique in that it is directly and immediately compensating for changes in air density throughout the entire column of air between the transducer face and the liquid surface.

Conventional temperature compensation does not react quickly enough to be really effective and can only compensate at the point at which the temperature is measured. DUET is a significant breakthrough. In tests, against a temperature variation of more than 30ºC, DUET plus FlowCERT achieved linear measurement accuracies of ±0.5mm.

FlowCERT also offers 32-point linearisation and velocity x area flow calculations where no primary measurement device exists, with the addition of Pulsar’s Speedy velocity sensor. Speedy is available either as a “wedge” sensor to be fitted to the bottom of a channel or pipe, or as a pipe sensor. In both cases the Doppler effect is used to calculate the liquid flow velocity.

Speedy Interface

Pulsar’s Speedy Interface is a digital to analogue converter that works with the latest Speedy velocity sensor in two important ways. It frees up the RS485 output from a FlowCERT controller in applications where digital RS485 communications are required, and allows users of Pulsar's older equipment to upgrade to the latest Speedy sensor. It also provides the option of alarms based on flow velocity. 

Pulsar's Speedy velocity sensor communicates digitally and is designed to connect to Pulsar's FlowCERT open channel flow monitor via FlowCERT's on-board RS485 interface board, where it provides the velocity measurement for velocity x head calculations of flow where no primary measurement device (PMD) exists. However, there are some applications where external digital communications are required, for example to network flow measurements or modify the programming of the unit. Speedy interface converts the digital output of the Speedy velocity sensor into a 4-20mA signal proportional to the flow velocity, which can then be fed to the analogue input terminal on the FlowCERT controller. This leaves the RS485 connection included in the FlowCERT free to be used for digital bus communications.

Speedy Interface is easily configured using the integral keyboard, and includes a display of flow velocity. There are two on-board relays that can provide alarms or control signals on high or low flow velocity. The Speedy Interface is self-contained to the extent that it can be used without the FlowCERT controller where a simple alarm on flow velocity or a 4-20mA signal proportional to velocity is required.

FlowCERT

FlowCERT offers a high degree of accuracy on almost any flume or weir construction found worldwide. It features a 32 point curve fit facility for non-standard flumes or weirs should it be required.

• Choice of DUET transducer assembly with high resolution and accuracy in varying climatic conditions or dBMACH3 transducer.
• Optional Speedy Velocity Sensor for applications where no flume or weir (PMD) is present performs a velocity x area calculation to establish flow rate.
• Uses doppler frequency changes to measure liquid velocity when inserted into a channel or pipe.

DUET

DUET is a new concept in ultrasonic measurement featuring two transducers mounted on a common frame, one higher than the other. Both transducers fire together, but the echoes returning from the flow surface are only processed at the lower unit. By constantly monitoring the phase difference between the two transducers, DUET dynamically compensates for any changes in the speed of sound between the transducers and liquid surface.

Conventional transducers compensate for variations in temperature which, while important, is only part of the story. The speed of sound actually varies with air density, which derives primarily from changes in temperature. DUET is unique in that it is directly and immediately compensating for changes in air density throughout the entire column of air between the transducer face and the liquid surface.

Conventional temperature compensation does not react quickly enough to be really effective and can only compensate at the point at which the temperature is measured. DUET is a significant breakthrough. In tests, against a temperature variation of more than 30ºC, DUET plus FlowCERT achieved linear measurement accuracies of ±0.5mm.

FlowCERT also offers 32-point linearisation and velocity x area flow calculations where no primary measurement device exists, with the addition of Pulsar’s Speedy velocity sensor. Speedy is available either as a “wedge” sensor to be fitted to the bottom of a channel or pipe, or as a pipe sensor. In both cases the Doppler effect is used to calculate the liquid flow velocity.

Speedy Interface

Pulsar’s Speedy Interface is a digital to analogue converter that works with the latest Speedy velocity sensor in two important ways. It frees up the RS485 output from a FlowCERT controller in applications where digital RS485 communications are required, and allows users of Pulsar's older equipment to upgrade to the latest Speedy sensor. It also provides the option of alarms based on flow velocity. 

Pulsar's Speedy velocity sensor communicates digitally and is designed to connect to Pulsar's FlowCERT open channel flow monitor via FlowCERT's on-board RS485 interface board, where it provides the velocity measurement for velocity x head calculations of flow where no primary measurement device (PMD) exists. However, there are some applications where external digital communications are required, for example to network flow measurements or modify the programming of the unit. Speedy interface converts the digital output of the Speedy velocity sensor into a 4-20mA signal proportional to the flow velocity, which can then be fed to the analogue input terminal on the FlowCERT controller. This leaves the RS485 connection included in the FlowCERT free to be used for digital bus communications.

Speedy Interface is easily configured using the integral keyboard, and includes a display of flow velocity. There are two on-board relays that can provide alarms or control signals on high or low flow velocity. The Speedy Interface is self-contained to the extent that it can be used without the FlowCERT controller where a simple alarm on flow velocity or a 4-20mA signal proportional to velocity is required.