Description
Product Introduction
To be honest, the Yokogawa ALP111-S00 is an indispensable I/O card for custody transfer metering and high-precision flow measurement loops in CENTUM VP distributed control systems. This FIO-compliant pulse input module accepts frequency and pulse train signals from turbine meters, positive displacement meters, and tachometers, converting them into reliable totalized volume and flow rate data.
Engineered for rugged industrial environments, it isolates field transients from the core processor backplane. In our field experience, keeping a verified spare ALP111-S00 on hand is essential for hydrocarbon processing plants, where an unannounced pulse card failure stops certified custody transfer tracking instantly.
Key Technical Specifications
| Parameter | Value |
| Module Type | Pulse Input Module (FIO Standard Type) |
| System Compatibility | Yokogawa CENTUM VP & ProSafe-RS DCS |
| Number of Input Channels | 8 Channels (isolated) |
| Input Signal Type | Voltage pulse, dry contact, or open collector |
| Maximum Input Frequency | Up to 10 kHz (application dependent) |
| Input Power Supply | 24V DC \pm 20% (via node unit bus) |
| Maximum Current Consumption | 0.4 A (Approx. 2.0 W power draw) |
| Explosion Protection | None (-S00 standard non-hazardous rating) |
| Operating Temperature | 0°C to +60°C |
| Physical Dimensions | Approx. 7.7 cm \times 4.2 cm \times 10.6 cm |
| Weight | Net \sim0.3 kg |
Application Scenarios & The “Trench” Experience
Picture this: It’s 4:00 AM at an export loading terminal. A massive crude oil tanker is hooked up to the manifold, and batch metering is running at full tilt. Suddenly, the primary fiscal meter reading freezes on the CENTUM VP operator screen because a lightning strike near the marshalling yard fried the pulse input card’s front-end optical isolators. Loading operations halt immediately, incurring massive demurrage penalties per hour. Having a direct, pre-tested surplus ALP111-S00 module on the maintenance shelf allows technicians to swap the card and resume custody transfer within minutes.
- Oil & Gas – Custody Transfer Metering: Totalizing high-frequency pulse outputs from turbine and Coriolis flowmeters for accurate fiscal accounting.
- Chemical Processing – Batch Reactor Feeding: Monitoring precise fluid addition rates via positive displacement flow sensors.
- Power Generation – Turbine Overspeed Monitoring: Tracking high-speed rotational frequency pulses to ensure emergency trip reliability.
ALP111-S00
ALP111-S00
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Yokogawa node racks. Every unit goes through a strict verification protocol:
- Inbound Inspection: Visual check for pin damage, bus connector integrity, and anti-counterfeit OEM label verification.
- Live Rig Testing: Insertion into an active FIO node unit rack to perform power-on self-tests and verify 24V bus power regulation.
- Pulse Train Simulation: Injecting calibrated 1 kHz to 10 kHz square-wave pulse trains into all 8 channels to verify counter accuracy and totalization registers.
- Thermal Stability Check: Operating the module under continuous signal load to verify internal component thermal dissipation.
- Final QC & Anti-static Packaging: Clearing internal memory registers, sealing in high-grade ESD shielding bags, and packing with shock-absorbing foam.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Hazardous Area Barriers: Do not wire unbuffered field signals from hazardous area flowmeters directly into a standard -S00 module unless appropriate galvanic isolators or intrinsic safety barriers are installed in the signal loop.
❗ Node Bus Hot-Swap Protocol: Always isolate node power or verify system software permission before extracting the ALP111 module. Yanking an active FIO card without proper software deactivation can corrupt the node processor’s I/O mapping table.
⚠️ Shield Grounding and Common-Mode Noise: Ensure pulse signal cable shields are grounded at only one end (typically the marshalling panel side) to avoid ground loops. High-frequency electrical noise picked up by unshielded pulse lines will cause phantom totalizer counts and erratic flow readings.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the ALP111-S00 hot-swappable?
A: Yes, the FIO hardware architecture supports online module replacement within compatible node units, provided your system configuration allows maintenance without tripping safety or control interlocks.
Q: Do I need to reconfigure the module after replacing it?
A: No. Channel configuration and scaling parameters are stored in the CENTUM VP engineering station and downloaded automatically to the replacement card upon boot.
Q: Does this unit come with a warranty?
A: Yes. All surplus and fully tested units include a standard 12-month replacement warranty.
Q: Why choose surplus over direct OEM channels for this card?
A: Legacy DCS components often carry extended factory lead times. We source surplus and overstock inventory so you can get an immediate, tested replacement to keep your plant compliant and running.
Start Chat
