VG Smart Technology T200 Single-Channel Multi-Parameter Transmitter

Overview

The VG Smart Technology T200 Single-Channel Multi-Parameter Transmitter is an industrial-grade digital process transmitter engineered for continuous, real-time monitoring of multiple water and wastewater quality parameters within a single measurement channel. Unlike conventional single-parameter transmitters, the T200 employs a unified digital architecture that supports plug-and-play integration with a broad family of smart digital sensors—including pH, ORP, dissolved oxygen (DO), conductivity, salinity, turbidity, suspended solids (SS), sludge interface, and ion-selective electrode (ISE) sensors. Its core design follows the principle of sensor-agnostic signal conditioning: each connected sensor communicates via a standardized digital interface, enabling automatic identification, firmware handshake, and parameter-specific scaling without manual configuration. The transmitter operates on a robust embedded platform compliant with IEC 61000-4 electromagnetic compatibility standards and is calibrated traceably to NIST-traceable reference standards during factory verification. It is intended for fixed-installation use in process-critical environments where long-term stability, repeatability, and interoperability across heterogeneous sensor types are essential.

Key Features

• Single-channel architecture supporting up to 10 distinct digital sensor types—pH, ORP, DO, conductivity, salinity, turbidity, SS, sludge interface, and ISE—with automatic sensor detection and parameter mapping.
• Dual isolated 4–20 mA analog outputs, independently programmable to represent any measured parameter or derived value (e.g., temperature-compensated conductivity or % saturation DO).
• Three fully configurable relay outputs supporting high/low alarm thresholds, maintenance triggers (e.g., scheduled sensor cleaning), time-based actuation, and fault-state signaling—all assignable per parameter via intuitive menu navigation.
• Hot-swap capability: Sensors may be replaced or reconfigured under live power conditions; the transmitter auto-detects new sensor identity, model number, and calibration status without requiring system reset or manual reconfiguration.
• Bilingual (English/Chinese) graphical user interface with context-sensitive workflow prompts, step-by-step calibration wizards, and real-time diagnostic feedback—including sensor health indicators and communication integrity checks.
• IP65-rated ABS enclosure rated for indoor and semi-outdoor deployment in humid, chemically aggressive, or dust-laden environments typical of bioreactors, chemical dosing stations, and municipal water treatment facilities.

Sample Compatibility & Compliance

The T200 is compatible exclusively with VG Smart Technology’s certified digital sensor family, all featuring RS485/Modbus RTU output and built-in temperature compensation. Sensors utilize chemically resistant materials—including acid-alkali-resistant glass pH bulbs, Pt1000 RTD elements, and optical turbidity cells with sapphire windows—to ensure long-term reliability in corrosive media. The transmitter meets CE marking requirements under the EU Electromagnetic Compatibility Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. Its analog outputs comply with IEC 60947-5-1 for industrial control equipment, and relay logic conforms to SIL 2 functional safety principles per IEC 61508 when integrated into larger safety instrumented systems (SIS). While not FDA 21 CFR Part 11-certified as a standalone unit, audit trails, calibration logs, and parameter change histories are timestamped and exportable—supporting GLP/GMP-aligned documentation practices in regulated water quality applications.

Software & Data Management

Data acquisition and configuration are managed locally via the front-panel interface or remotely through Modbus RTU over RS485. The transmitter stores up to 30 days of 1-minute interval historical data onboard (non-volatile memory), including raw sensor values, temperature readings, and relay activation timestamps. All configuration changes—including range settings, alarm thresholds, and relay assignments—are logged with user ID (if enabled), timestamp, and pre-/post-change values. Optional PC-based configuration software (VG ConfigTool v3.x) provides batch setup, firmware updates, and CSV report generation. Integration with SCADA, DCS, or cloud-based IIoT platforms is supported via standard Modbus register mapping—enabling seamless ingestion into PI System, Ignition, or Siemens Desigo CC without proprietary drivers.

Applications

The T200 serves as a central monitoring node in diverse industrial and municipal processes where multi-analyte insight improves process control fidelity and reduces instrumentation footprint. Key application domains include: aerobic and anaerobic bioreactor monitoring in pharmaceutical fermentation; pH and ORP control in chlorine dosing and coagulant feed systems at drinking water plants; simultaneous conductivity and turbidity tracking in boiler feedwater and cooling tower circuits; real-time sludge blanket level and SS concentration monitoring in clarifiers and thickeners; and corrosion-resistant sensing in flue gas desulfurization (FGD) scrubber recirculation loops. Its modular sensor support enables retrofitting legacy analog systems with digital intelligence while preserving existing 4–20 mA infrastructure.

FAQ

Does the T200 support HART or Foundation Fieldbus protocols?
No—the T200 uses RS485-based Modbus RTU exclusively. It does not implement HART, Foundation Fieldbus, or Profibus physical or protocol layers.
Can the transmitter store calibration coefficients for multiple sensors simultaneously?
Yes—each connected digital sensor retains its own factory calibration and user-adjusted offset/gain coefficients in non-volatile memory. The T200 references these per-sensor profiles automatically upon connection.
Is the 24 V DC power option intrinsically safe?
No—the 24 V DC variant is non-IS rated. For hazardous area installations, the unit must be mounted in a Class I, Division 2 or ATEX Zone 2-compliant enclosure with appropriate barrier certification.
What is the maximum cable length between the T200 and a digital sensor?
Up to 100 meters using shielded twisted-pair cable (AWG 22–24) with proper grounding. Longer runs require active repeaters or fiber-optic media converters.
Does the T200 provide temperature compensation for all supported parameters?
Yes—integrated Pt1000 or NTC thermistor inputs (depending on sensor type) enable automatic temperature compensation for pH, conductivity, DO, and turbidity per ISO 7888, ASTM D1125, and EN 27888 standards.