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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | ATB16-4 |
| Manufacturer | Valmet Automation / Lyngso Marine |
| Module Type | 16-Channel Relay Card / PCB Module |
| Primary Function | Relay interface with 4-20mA signal output |
| Channel Count | 16 channels |
| Signal Type | 4-20mA current loop |
| Temperature Range | 0-100°C (Bnr 0-100˚C) |
| Weight | 740 g (1.63 lbs) |
| Alternate Part | ATB16-4/2 terminal board variant exists |
| Related Model | ATB16/3 temperature monitoring interface (0-100°C) |
| Application | Temperature transmitter / process monitoring interface |
| Condition | Used, marine/industrial surplus |
Product Introduction
Valmet ATB16-4 is a 16-channel relay card controller board module used for temperature transmitter and process monitoring applications. It provides 4-20mA current loop signaling for 0-100°C temperature ranges in industrial and marine automation systems.
This module is associated with Lyngso Marine and Wieland Bamberg systems, commonly found in marine process control and temperature monitoring installations. It is typically sourced as used surplus from decommissioned marine or industrial equipment.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No 4-20mA output on channels | Module power failure or internal fault | ✅ High | Measure module supply voltage (check 24V input), check output at terminals | Replace module if input power is present but no output |
| One channel dead, others work | Channel relay driver failure | ✅ High | Test output on affected channel with multimeter, compare to working channel | Replace module if single channel fails consistently |
| All channels show 0mA | Power supply or wiring fault upstream | ❌ Medium | Check 24V supply at module input, verify common ground | Check PSU and wiring before replacing module |
| Output stuck at 20mA max | Shorted output or relay stuck closed | ✅ High | Disconnect load, measure output current, check for short | Replace module if output stays high with load removed |
| Temperature reading wrong (0-100°C) | Calibration drift or sensor fault | ❌ Medium | Verify sensor with known reference, check sensor wiring | Replace sensor first, then module if reading still wrong |
| Intermittent channel response | Loose terminal or corrosion | ❌ Low | Inspect terminal connections, check for corrosion/vibration | Clean terminals and reseat connections before replacement |
| Module overheats or burns | Overcurrent or shorted channel | ✅ High | Measure channel current draw, inspect for burnt components | Replace module and correct the shorted load |
Contact technical support with photos of the front label, terminal wiring, multimeter readings (input voltage and output current), and the application system if you cannot isolate the fault.
- ATB16-4
Frequently Asked Questions
Q: Is Valmet ATB16-4 still available from the factory?A: No. This is a legacy marine/industrial module. You will find it only through surplus dealers as used stock, often from decommissioned Lyngso Marine or Wieland Bamberg systems.
Q: What does the “16” in ATB16-4 mean?A: It indicates 16 channels. This module handles 16 separate relay outputs with 4-20mA current loop signaling for temperature or process monitoring.
Q: Is ATB16-4 the same as ATB16/3?A: No. ATB16/3 is a temperature monitoring interface module (also 0-100°C), but ATB16-4 is the relay card controller board. They serve different functions in the system.
Q: Can I hot-swap this relay module?A: Do not assume it is hot-swappable. Kill power to the rack before removal. Pulling relay modules live can damage the backplane or cause relay chatter.
Q: Will configuration be lost when I swap it?A: This module is typically a pass-through relay interface. It does not hold user logic, but you should verify channel mapping and calibration after the swap, especially for temperature readings.
Q: What is the ATB16-4/2 variant?A: ATB16-4/2 is a terminal board variant of the same module family. It may have different terminal arrangements but serves the same 16-channel relay function.
Q: Why is it cheaper than ordering new from OEM?A: Because the OEM does not actively stock it. You are buying used surplus from decommissioned marine or industrial systems, which drives the price down but adds verification responsibilities.
Q: What temperature range does this module support?A: The module is rated for 0-100°C temperature monitoring, with 4-20mA current loop output for process transmitter applications.
Q: Is this a direct replacement for every ATB16-4?A: The model number is the right first check. However, verify the variant (ATB16-4 vs ATB16-4/2 terminal board) and your system compatibility (Lyngso Marine, Wieland Bamberg) before ordering. Do not assume plug-and-play without that check.
