Description
Overview
Modern process plants demand a quarter-turn explosion-proof actuator that does more than just open and close a valve. It must talk to PLCs, accept remote setpoints, report its health, and fail safely. The BJ/BJM15-IIC Series from Bonray (a factory specializing in high-integrity valve automation) delivers this level of intelligence. This quarter-turn explosion-proof actuator integrates absolute position and torque sensors, a multi-language LCD, and plug-in fieldbus cards. You get a device that not only moves a butterfly valve but also becomes a node in your Industrial Internet of Things (IIoT) network.
The factory builds each quarter-turn explosion-proof actuator around a planetary gearbox that eliminates the hand/auto shift mechanism – a common source of failure and maintenance. With output torque from 50 to 3000 N.m and a compact footprint, this actuator fits any quarter-turn valve. You control it via analog (4-20mA), digital (dry contacts or voltage), or digital bus (Profibus, Modbus, Devicenet, Hart, FF). The non-intrusive interface allows you to change parameters, read torque profiles, and diagnose faults without opening the housing, preserving the IP68 seal.
Features
1. Absolute Encoder Technology
The factory uses a non-contact BM12 single-turn encoder for valve position.
Field Application Diagram of BJBJM-IIC A separate absolute torque sensor reads actual output torque.
No batteries needed. Power loss does not affect position memory.
Accuracy remains stable from -30°C to +70°C.
2. Fieldbus-Ready Architecture
The main control board includes a standard 4-20mA input/output.
You plug a daughter card into the bus slot: Profibus-DP (V0 or V1), Modbus RTU (half or full duplex), Devicenet, FF, Hart, or even wireless (4G, LoRa, Bluetooth).
The quarter-turn explosion-proof actuator appears as a slave on the bus, sharing position, torque, alarms, and accepting setpoints.
3. Redundant Bus Option
For critical services (e.g., pipeline stations), the factory offers dual bus cards.
If one bus card fails, the second card takes over automatically.
Redundant Profibus or Modbus cards are available.
4. Data Logging and Diagnostics
The actuator stores peak torque values, number of starts, and total travel.
You retrieve this data via the IR setter or bus communication.
Predictive maintenance: track torque trends to detect valve wear before a failure.
5. ESD with Selectable Override Logic
Program ESD to act as “close”, “open”, or “freeze” (disable all motion).
Choose whether ESD overrides a local stop command or a motor overheat condition.
ESD can be active-high (24Vdc or 220Vac) or active-low (0V).
6. Loss of Signal Protection
In analog control mode, you configure the actuator’s behavior when the 4-20mA signal drops below 3.6mA.
Options: stay put, go to full open, go to full closed, or go to a preset position.
The quarter-turn explosion-proof actuator reports a “Signal Loss” alarm via relay or bus.
7. Dual-Stable Relays for Power-Off Memory
The 62x wiring series uses magnetic latching relays for S1-S4 outputs.
Even if you cut power to the actuator, the relay contacts maintain their last state.
Critical alarms (e.g., over-torque) do not disappear when the power cycles.
Model and Type
The factory divides the quarter-turn explosion-proof actuator range by duty cycle and control complexity. Choose based on your required starts per hour and positioning precision.
| Type | Starts/Hour | Duty Cycle | Control Modes | Best For |
|---|---|---|---|---|
| BJ15-IIC On-Off | ≤60 | 33.3% | Dry contacts, voltage | Isolation valves, on/off services |
| BJ15-IIC Intermittent Modulating | ≤60 (600 for 3-phase) | 33.3% | Adds 4-20mA | Tank level, simple flow loops |
| BJM15-IIC Frequent Modulating | ≤1200 (600 single-phase) | 50% | Solid-state relays, higher accuracy | Dosing, HVAC, continuous regulation |
| BJM-IICF Split-Body | Same as BJM-IIC | Same as BJM-IIC | All above, with remote controller | High temp, high vibration |
Specifications
- Power Supply：Single-phase: 220Vac ±10%, 50/60Hz Three-phase: 380Vac ±10%, 50/60Hz; (Factory also supplies 110V, 240V, 415V, 24Vdc on request)
- Control Signals：4-20mA, dry contacts, DC24V, AC220V pulse/level; Profibus-DP, Modbus, Hart, Devicenet, FF
- Mounting：ISO5211:2017 (F05, F07, F10, F12, F14, F16)
- Ambient Temp ：-30°C to +70°C
- Protection Class：IP68 (2m, 48h); Flameproof: Ex db IIC T4 Gb; Dust-proof: Ex tb IIIC T130°C Db
- Output Torque：50 N.m to 3000 N.m
- Output contact capacity: 250Vac/5A or 30Vdc/5A
- Output current load impedance: ≤750Ω
Does this quarter-turn explosion-proof actuator support Modbus TCP/IP over Ethernet?
Not directly on the standard card. However, the factory offers a Modbus RTU-to-TCP gateway that you install near the actuator. The gateway converts the serial signal to Ethernet. Alternatively, choose the Profinet option (available on request).