STBT2900 FLOW MONITOR
The STBT2900 flow monitor incorporates state-of-the-art, digital signal processing technology, designed to provide exceptional flexibility at a very affordable price. Though it is designed for use with Blancett flow sensors, this monitor can be used with almost any flow sensor producing a low amplitude AC output or contact closure signal.
This monitor can accept low-level frequency input signals typically found in turbine flow sensors. The output signal for these types of sensors is a frequency proportional to the rate of flow. The STBT2900 monitor uses the frequency information to calculate flow rate and total flow. Through the use of the programming buttons, you can select rate units, total units and unit time intervals among other functions. If required, the monitor can easily be re-configured in the field. Finally, you can choose between simultaneously showing rate and total, or alternating between rate and grand total.
The monitor provides advanced communication capabilities over an RS485 bus using Modbus RTU and control outputs.
The package is a polycarbonate NEMA 4X enclosure.
Applications
The BT2900 monitor is suitable for application in a wide variety of metering needs. A few of the more common industries are:
Features
| SPECIFICATIONS | |
| Display | Common: Simultaneously shows Rate and Total; 5 x 7 Dot Matrix LCD, STN Fluid 6 Digit Rate, 0.5 inch (12.7 mm) numeric 7 Digit Total, 0.5 inch (12.7 mm) numeric Engineering Unit Labels 0.34 in. (8.6 mm) Annunciators: Alarm 1, Alarm 2, Battery Level, RS485 Communications (COM) |
| Power | Auto switching between internal battery and external loop power; includes isolation between loop power and other I/O Battery: 3.6V DC lithium D Cell gives up to 6 years of service life Note: Modbus enabled at baud rate of 19,200 or higher without loop power reduces battery life to 1 year Loop: 4…20 mA, two wire, 25 mA limit, reverse polarity protected, 7V DC loop loss |
| Modbus Digital Communications | Modbus RTU over RS485, 127 addressable units / 2-wire plus ground network, selectable baud rate: 9600, 19200, 38400, 57600 or 115200, long integer and single precision IEEE754 formats; retrieve: flow rate, job totalizer, grand totalizer, alarm status and battery level; write: reset job totalizer, reset grand totalizer |
| Power Data Configuration and Protection | Two four-digit user selectable passwords; level one password enables job total reset only, level two password enables all configuration and totalizer reset functions |
| Certifications | Safety: Intrinsically Safe; Class I Division 1, Groups C, D; Class II, Division 1 Groups E, F, G Entity Parameters: 4…20 mA Loop: Vmax = 28V DC; Imax = 26 mA; Ci = 0.5 μF; Li = 0 mH Pulse Output: Vmax = 28V DC; Imax = 100 mA; Ci = 0 μF; Li = 0 mH Reset Input: Vmax = 5V DC; Imax = 5 mA; Ci = 0 μF; Li = 0 mH RS485: Vmax = 10V DC; Imax = 60 mA; Ci = 0 μF; Li = 0 mH Turbine Input: Voc = 2.5V; Isc = 1.8 mA; Ca = 1.5 μF; La = 1.65 H EMC: IEC61326-1; 2004/108/EC |
| Measurement Accuracy | Common Accuracy: 0.05% |
| Response Time (Damping) | 1…100 seconds response to a step change input, user adjustable |
| Environmental Limits | –22…158° F (–30…70° C); 0…90% humidity, non-condensing; |
| Materials and Enclosure Ratings | Polycarbonate, stainless steel, polyurethane, thermoplastic elastomer, acrylic; NEMA 4X/IP 66 meter, remote and swivel mount; NEMA/UL/CSA Type 4X (IP-66) |
| Engineering Units | Liquid: US Gallons, Liters, Oil Barrels (42 gallon), Liquid Barrels (31.5 gallon), Cubic Meters, Million Gallons, Cubic Feet, Million Liters, Acre Feet Gas: Cubic Feet, Thousand Cubic Feet, Million Cubic Feet, Standard Cubic Feet, Actual Cubic Feet, Normal Cubic Meters, Actual Cubic Meters, Liters Rate Time: Seconds, minutes, hours, days Totalizer Exponents: 0.00, 0.0, X1, x10, x100, x1000 K-factor Units: Pulses/US Gallon, Pulse/cubic meter, pulses/liter, pulses/cubic foot |