Email: jiedong@sxrszdh.com
Phone / Wechat：+86 15340683922Description
Product Core Brief
- Model: DS200SSHVMG1A
- Brand: General Electric (GE)
- Series: Mark V DS200
- Core Function: Safety-rated valve monitor with partial stroke testing
- Product Type: Safety Valve Monitor (1 channel, SIL 2)
- Key Specs: 4–20 mA feedback | 2 x safety relay outputs | Partial stroke test | SIL 2 certified
- Condition: New Original.
Product Introduction
The DS200SSHVMG1A is a safety-rated valve position monitor for GE’s Mark V DS200 series, used in Safety Instrumented Systems (SIS) for emergency shutdown valves. It monitors the position of critical safety valves and provides partial stroke testing (PST) to verify valve operation without full closure.
The SSHVMG1A is certified to SIL 2 per IEC 61508. It accepts a 4–20 mA position feedback from the valve, compares it to the commanded state, and provides two safety-rated relay outputs (valve closed, valve open). The partial stroke test feature automatically moves the valve to 10–20% stroke and back, verifying it has not stuck. Use it for emergency shutdown valves (ESD), blow-down valves, and any safety-critical valve that must operate on demand.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Position feedback input | 4–20 mA (2-wire or 4-wire) |
| Feedback accuracy | ±0.5% of span (SIL 2 rated) |
| Feedback loop power | 24 VDC supplied (100 mA) |
| Discrete inputs | 4 x 24 VDC (valve limit switches, PST request) |
| Safety relay outputs | 2 x Form C (1 A @ 24 VDC) |
| Safety output rating | SIL 2 capable (IEC 61508) |
| Partial stroke test | Programmable: stroke 5–20%, hold time 1–60 sec |
| PST interval | Programmable 1–365 days |
| PST auto-revert | Yes (returns to original position) |
| Valve position thresholds | Open: 85–100%, Closed: 0–15%, configurable |
| Diagnostic coverage | >90% (including PST) |
| Safety integrity level | SIL 2 (IEC 61508, IEC 61511) |
| HFT (Hardware Fault Tolerance) | 0 (type B subsystem) |
| PFDavg | <1.0 × 10⁻² (1 year) |
| Proof test interval | 1 year (or per PST schedule) |
| Event logging | 1000 events (time-stamped) |
| Configuration | Web browser (HTTP/HTTPS) |
| Operating temperature | −40°C to +70°C |
| Dimensions | 6U x 4HP x 160 mm (single slot) |
| Accessories | SIL 2 certificate, safety manual, configuration guide, PST configuration tool |
Key Selling Points & Differentiators
- SIL 2 certified for emergency shutdown valves – TÜV certified per IEC 61508. Use for ESD valve monitoring.
- Partial stroke testing (PST) – Automatically moves valve to 5–20% stroke and returns. Verifies valve not stuck. No process interruption. Logs results.
- Safety-rated relay outputs – Two outputs: “Valve Closed” and “Valve Open”. Energized to safe state (de-energize to trip). SIL 2 rated.
- Diagnostic coverage >90% – Includes PST, feedback loop monitoring, output monitoring.
- Programmable PST schedule – Daily to yearly. Automatic execution. Reports pass/fail.
- Event logging (1000 events) – Records all PST results, valve position changes, faults.
- Web configuration – No software installation. Configure via web browser.
- QC includes SIL 2 validation – Verified by TÜV-certified test procedures.
- 5-year warranty
Frequently Asked Questions (FAQ)
Q: What is Partial Stroke Testing (PST)?
A: PST partially moves a safety valve (typically 10–20% of stroke) and returns it to the original position. This verifies the valve is not stuck. Full stroke testing would shut down the process. PST allows proof testing without interruption. Required by IEC 61511 for SIL 2 safety functions.
Q: How does PST work?
A: The board sends a signal to move the valve (via external solenoid valve or positioner). It monitors the 4–20 mA feedback to verify the valve moves to the setpoint, then returns. The PST request can be manual (input contact) or scheduled (automatic). PST duration typically 1–5 minutes.
Q: What valves are compatible with SSHVMG1A?
A: Any valve with 4–20 mA position feedback and ability to be positioned partially (via I/P converter or smart positioner). For on/off valves (no positioner), PST cannot be performed. Use external solenoid valve cycling instead.
Q: Do I need to proof test the valve annually if I use PST?
A: IEC 61511 allows reduced proof test interval with PST. For SIL 2, PST monthly may extend full proof test to 5 years. Consult your safety engineer. The board logs PST results for review.
Q: Can the SSHVMG1A be used without PST?
A: Yes—as a simple SIL 2 valve position monitor. Disable PST via configuration. The board will monitor valve position and provide safety relay outputs.
Q: What QC tests are specific to the SSHVMG1A?
A: Ten tests:
- Feedback accuracy: 4–20 mA, error <±0.5%
- Safety relay operation: 1000 cycles at 1 A
- PST execution: 5%, 10%, 20% stroke, verify position and return
- PST fault detection: simulate stuck valve, verify alarm
- Diagnostic coverage: >90% via fault injection
- PFDavg calculation: <1.0 × 10⁻²
- Isolation: input/output to backplane at 2500 VAC
- Event logging: 1000 events read/write
- Temperature: −40°C to +70°C
- Burn-in: 168 hours at +65°C
Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, hard plastic clamshell case, desiccant. Double-wall box with “SAFETY CERTIFIED,” “SIL 2” labels. SIL 2 certificate laminated. Safety manual (150 pages) included. Configuration guide included. PST configuration tool (USB) included. Each board ships individually. Factory site visit recommended for first-time safety integration. Contact us for safety application engineering support.
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