The batch controller utilizes the Extended counter main board and FR dual channel signal conditioner board to accept a wide range of pulse signals, in particular those from turbine flowmeters. The same signal is applied in parallel to the A and B channelsA 10 A contact relay serves as the batch relay to control repetitive fill operations. It repeats the batch cycles continually with a programmable delay from 10 ms to 199.99 sec, or based on an external control input. The batch total (Item #1) can be set up to count up from zero to a preset limit, or down from a preset limit to zero. The single-relay board fits in the slot which would otherwise be available for the analog output board.
An optional dual relay board (10 A contact or 0.12 A AC/DC solid state relays) is normally used. Either relay can be assigned to the batch total (Item #1) to serve as a pre-warn to slow down filling near the setpoint, to the grand total or number of batches (Item #2), or to flow rate (Item #3).An optional RS-232 or RS-485 board allows the batch controller to transmit Items #1, #2 and #3, as well as peak for #3 (rate). If required, all four items can be displayed simultaneously by augmenting the batch controller with up to three Laureate remote displays. Each of these can have its own analog output and dual relays for alarm or control.
Channel A is used for totalizing. The measured total is scaled mathematically for control and display in engineering units, such as litersChannel B is used for rate. The pulse frequency is determined by timing an integral number of periods over a specified gate time (plus 30 ms and 0-2 periods), and then taking the inverse of period. The inverse period approach allows much greater accuracy and faster update times than conventional rate meters which count signal pulses over a specified time interval. Update times can be as high as 25/sec. Rate in engineering units, such as liters per second, is obtained by multiplying the input by a scale factor.
For either total or rate, displayed values can be up to six digits (999,999) with a selectable decimal point.
Nine hysteresis and input levels are jumper selectable for reliable measurements at different signal levels. A 1600 Hz low-pass rolloff filter for noise reduction is selectableA built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
|Readout||6 digits, 7-segment, 14.2 mm (.56")||5 Vdc||5 Vdc ±5%, 100 mA max|
|Color||Red or green LED||10 Vdc||10 Vdc ±5%, 120 mA max|
|Range||-99999 to +99999 XXXXEX scientific notation beyond 999999||24 Vdc||24 Vdc ±5%, 50 mA max
|Indicators||4 red LED lamps||Output isolation||50 Vdc to meter ground|
|Time Base||Crystal calibrated to ±2 ppm|
|Span Tempco||±1 ppm/°C (typ)|
|Long-term Drift||±5 ppm/year|
|Frequency Technique||Inverse period||Voltage, std.
||85-264 Vac and 90-370 Vdc
|Conversion Time||Gate time + 30 ms+ 0-2 signal periods||Frequency
||DC or 49-440 Hz
|Gate Time||Selectable 10 ms to 199.99 s||Voltage, opt.||8-28 Vac and 9-37 Vdc
||Selectable 10 ms to 199.99 s
||Power isolation||Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
|Output & Display Updates||Same as conversion time|
||Pulses from NPN, PNP transistors, contact closures, magnetic pickups, AC||Selectable Hysteresis||(-12 mV to +12 mV), (+30 mV to +60 mV),
(-30 mV to -20 mV), (-150 mV to +150 mV),
(+350 mV to +600 mV), (-600 mV to -350 mV),
(-1.15 V to +1.15 V), (+1.25 V to +2.1 V),
|Signal ground||Common ground for channels A & B|
|Channel A Frequency||0 Hz to 1 MHz (totalizing), 0.005 Hz to 1 MHz (rate)||Rolloff Filter||(-2.1 V to -1.25 V)|
|Channel B Frequency||0 Hz to 250 kHz (totalizing), 0.005 Hz to 250 kHz (rate||Debounce Time||Selectable, none or 1600 Hz
Selectable 0, 3, 50 ms
|Operating Temperature||0°C to 55°C||Frequency Technique||Inverse period|
|Storage Temperature||-40°C to 85°C||Delay between batch cycles||Selectable 10 ms to 199.99 s|
|Relative Humidity||95% at 40°C, non-condensing||Display Update Time||Same as conversion time|
|Protection||NEMA-4X (IP-65) when panel mounted||Output Update Time||Same as conversion time|
The Prewarn relay slows down the pump near the preset to avoid overshoot. The Batch relay stops the pump at the preset. The Grand Total relay stops the filling operation once a predetermined number of drums have been filled.
Controller setup and monitoring of the mixing operation are facilitated by optional serial communications. RS-485 allows a single data line to handle multiple controllers.