Blancett B2900 flow monitor (rate / total), Modbus RTU, intrinsically safe
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Quick overview
- Type: Flow
- Signal / Protocol: 4–20 mA, Modbus, RS-485, Pulse / frequency
- Hazardous area: Hazardous-area rated / option
- Genuine productsSourced from the manufacturer or authorised channels
- Delivery across BangladeshDhaka, Chattogram and all industrial zones
- After-sales supportInstallation guidance and warranty handling
- Reply within 24 hoursCall +880 1713 552466 or email hello@argonmark.com
Specifications
| General | |
|---|---|
| Part no. | BD-1448 |
| Category | Oil & Gas Instruments |
| Group | Instrumentation & Control |
| Brand | Blancett |
| Model | B2900 |
| Technical | |
| Type | Flow |
| Signal / Protocol | 4–20 mA, Modbus, RS-485, Pulse / frequency |
| Hazardous area | Hazardous-area rated / option |
Datasheet
Technical features
| Digital signal processing; works with almost any flow sensor giving a low-amplitude AC or contact-closure signal | |
| Simultaneous rate and total, or alternating rate and grand total; batch and grand totals | |
| Field-programmable rate units, total units and time base | |
| Alarm outputs with programmable dead band and phase | |
| Modbus RTU over RS485 (127 addresses) for remote monitoring | |
| Meter, remote, swivel and hand-held mounting; NEMA 4X polycarbonate enclosure |
Applications
| Secondary oil recovery, fracturing, coal bed methane | |
| Chemical injection, fertilizer and pesticide dispensing, batching, cooling water |
General
| Display | 5 × 7 dot-matrix LCD; 0.5 in digits; alarm, battery and COM annunciators |
|---|---|
| Power | 3.6 V lithium D cell (up to 6 years) with automatic switch-over to 4–20 mA loop power (7 V loop loss) |
| Accuracy | 0.05% |
| Response | 1 to 100 s, adjustable damping |
| Environment | −30 to +70 °C; 0–90% RH non-condensing |
| Enclosure | Polycarbonate, NEMA/UL/CSA Type 4X (IP66) |
| Units | Gallons, litres, barrels, m³, acre-feet, scf, Nm³ and more; K-factor in pulses per gallon, m³, litre or ft³ |
| Certification | IS Class I Div 1 Groups C, D; Class II Div 1 Groups E, F, G; EMC IEC 61326-1 |
Key specifications
| Input | Magnetic pickup 1–3,500 Hz (turbine sensors), amplified pulse or contact closure |
|---|---|
| Display | 6-digit rate + 7-digit total, simultaneous |
| Accuracy | 0.05% (frequency measurement ±0.1%) |
| Output | 4–20 mA loop, totalizing pulse, 2 status alarms, Modbus RTU RS485 |
| Power | 3.6 V lithium D cell (up to 6 years) or 4–20 mA loop |
| Approvals | Intrinsically safe Class I Div 1 Groups C, D; Class II Div 1 E, F, G |
Inputs
| Frequency range | 1 to 3,500 Hz |
|---|---|
| Frequency measurement accuracy | ±0.1% |
| Trigger sensitivity | 30 mVp-p (high) or 60 mVp-p (low), jumper selected |
| Over-voltage protection | 28 V DC |
| Amplified pulse | Direct connection to sensor pre-amp output |
Outputs and communication
| Analog | 4–20 mA two-wire loop, 25 mA limit |
|---|---|
| Totalizing pulse | One pulse per LSD increment; opto-isolated open collector or open drain FET; 28 V DC, 100 mA, max. 16 Hz, 30 ms |
| Status alarms | Two open-collector outputs, 28 V DC / 100 mA, adjustable rate with dead band |
| Digital | Modbus RTU over RS485, 127 units, 9,600–115,200 baud |
| Security | Two 4-digit passwords |
Notes
| Data from the manufacturer's published datasheet. Confirm model, range, materials and approvals with Argonmark before ordering. |
Photo: courtesy of Blancett, used with permission (source) — background removed by Argonmark. All photo credits
Description
The Blancett B2900 is a flow rate indicator and totalizer that reads the low-level frequency signal of turbine flow sensors (1 to 3,500 Hz) or contact closures and shows rate and total at the same time. It is accurate to 0.05%, offers batch and grand totals, two alarm outputs, a 4–20 mA loop, a totalizing pulse and Modbus RTU over RS485.
It runs up to six years on a lithium D cell or from the 4–20 mA loop, sits in a NEMA 4X polycarbonate housing for meter, remote, swivel or hand-held mounting, and is intrinsically safe for Class I Div 1 areas.
Argonmark Ltd supplies Blancett instruments across Bangladesh — Dhaka, Chattogram, Gazipur, Narayanganj and the gas fields, refineries, terminals and power plants beyond. Send us the model, range, process connection, output and any hazardous-area requirement, and we will confirm the right configuration, lead time and price.
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