Designed for OCEMS Compliance
- CPCB 2025 API ready with AES-256 encryption
- All State PCB APIs and payload formats supported
- Parallel push to multiple servers and protocols
- Network failure handling with server backfill
Our Products
Chroma Nexus Data Logger and Nexus Cloud SAAS — purpose-built for emission compliance and industrial analytics.
New
Flagship product
Chroma Nexus Data Logger
Built for emission compliance — industrial AI on the edge.
A DIN-rail mounted edge gateway purpose-built for OCEMS reporting. CPCB 2025 API ready out of the box, with AES-256 encrypted payloads. Integrates with any Modbus, 4-20 mA or TCP/IP analyser and pushes to Central, State and customer cloud servers in parallel.
CPCB 2025 API ready
AES-256 encrypted
DIN-rail mountable
OCEMS compliant
What's inside
Engineered for every part of the stack.
From the analyser terminal to the State PCB API — Nexus handles every hop, with audit-grade reliability.
Versatile Instrument Connectivity
- Modbus RS485/RTU & Modbus TCP/IP
- 6-channel 4-20 mA analog inputs
- 6-channel digital inputs & outputs
- TCP/IP parsing for WTW / Xylem
High-Performance Hardware
- Quad-core ARM Cortex-A76 (64-bit) @ 2.4 GHz — industrial Raspberry Pi compute
- 2 GB LPDDR4X SDRAM (expandable)
- 16 GB industrial SD storage (expandable to 1 TB)
- 4G/LTE + WiFi + Gigabit Ethernet connectivity
ChromaTech Firmware Stack
- MQTT, REST API & FTP with TLS/SSL security
- Flexible JSON and text payload generator · CSV export
- IP-based configuration with integrated web server
- Device APIs for remote configuration via MQTT
Parameters supported
Measure the parameters your PCB reports require.
Nexus reads from any compatible emission, stack and water analyser — and pushes the values your State and Central PCB integrations expect.
BOD
COD
TSS
pH
Chlorine
PM
Flow
SO₂
SOx
NOx
NO
CO
Optional add-ons
Extend Nexus for your plant.
Calibration workflows, State PCB integrations and hardware add-ons — available on the same chassis.
Optional
State PCB API support
Haryana, MP, Maharashtra, Tamil Nadu and Telangana out of the box. Other state PCBs available on request.
Optional
Analyser Calibration
Calibration flow over Modbus write with integrated CPCB reporting — keep the audit chain intact during calibration cycles.
Optional
DI/DO Calibration Module
Add-on module — Modbus to 6-channel DI (potential-free input) and 6-channel DO (potential-free relay, max 5 A @ 230 VAC).
Companion platform
Nexus Cloud SAAS
The cloud half of the Nexus stack. Sign in to see live readings, historical telemetry, threshold alerts and the CPCB push results for every Chroma Nexus on your plant.
- Live sensor readings refreshing in real time, per device
- Online status with last-heartbeat indicator on every device
- Hourly history and 30-second calibration samples for any date
- Custom date ranges for historical telemetry analysis
- Threshold alerts with unresolved counts and full event history
- CPCB push results with 24-hour sparklines per integration
nexuscloud.boldally.in
Technical data sheet
Specifications
Full reference for procurement, integration and commissioning. Need a printable PDF version? Ask our team.
Power & Form Factor
- Rated input supply
- 12V / 24V DC
- Mounting
- DIN rail and wall mounting
- Dimensions
- 100 mm (W) × 120 mm (H) × 70 mm (D)
- Enclosure
- ABS plastic · IP30 (IP67 optional for outdoor)
- Terminals
- 5 mm pluggable terminal jacks
- Operating temperature
- 0 °C to 60 °C
- Storage temperature
- -2 °C to 80 °C
- Humidity
- Upto 85% (non-condensing)
- Weight
- 300 g (approx)
Compute & Memory
- Processor
- Quad-core eARM Cortex-A76 (64-bit) @ 2.4 GHz
- RAM
- 2 GB LPDDR4X (or higher)
- Storage
- 16 GB industrial SD card (expandable to 1 TB)
- RTC
- Inbuilt accurate RTC with battery · NTP sync
- Display
- OLED screen for status and configuration
Communication & I/O
- Ethernet
- Gigabit (1000 Mbps)
- 4G / LTE
- LTE Cat 1 · backward compatible with 2G/GPRS
- WiFi
- Built-in WiFi
- RS-485 ports
- Two ports · configurable Modbus master/slave
- Analog inputs
- 6 channels · 0-20 mA / 4-20 mA
- Digital I/O
- 6 digital input · 6 digital output
- USB ports
- 2× USB 3.0 · 2× USB 2.0
- Optional add-on
- 4× USB Ethernet 1 (secondary)
OCEMS & API
- CPCB API
- CPCB 2025 API push with AES-256 encryption
- State PCB APIs
- Haryana · MP · Maharashtra · Tamil Nadu · Telangana (others on request)
- Cloud protocols
- MQTT · REST · HTTP · FTP over SSL/TLS
- Analyser calibration
- Calibration flow over Modbus write with CPCB integration
- DI/DO calibration
- Add-on module · Modbus to 6-channel DI/DO (potential-free relays, max 5 A @ 230 VAC)
- Modbus capacity
- Upto 500 tags · 24 Modbus slaves per channel
- Data logger
- Flexible CSV files (daily / monthly / yearly) · IP based device access
Part numbers
Choose your Nexus.
Two variants. Same firmware stack, same OCEMS compliance — sized to plant scale.
Nexus 200
Part · CT200- Ethernet
- Gigabit
- 4G / LTE
- 4G/LTE (India · Asia)
- RAM
- 1 GB
- Storage
- 16 GB
- I/O bus
- USB · LAN
Recommended
Nexus 400
Part · CT400- Ethernet
- Gigabit
- 4G / LTE
- 4G/LTE (India · Asia)
- RAM
- 2 GB (upto 8 GB available)
- Storage
- 32 GB
- I/O bus
- USB · LAN
Want to evaluate Chroma Nexus on your plant?
Tell us about the analysers you need to integrate and we will scope the right Nexus variant and Cloud subscription for you.
