A magnetic pig signaler is a non-intrusive detector that clamps to the pipe, senses a magnet on the pig, and logs each pass with time. EMT’s unit needs no bore entry, no weld and no power line at the point of fit, which is why it suits live hazardous lines.
Introduction
A magnetic pig signaler solves the two problems that plague intrusive indicators. Mechanical flags can spark and jam, and electronic types false-trip on stray magnetic fields. EMT’s non-intrusive unit wraps the pipe, reads the magnet carried by the pig, and shows the result on a heated LCD. Because nothing enters the bore, there is no seal to leak and nothing to weld, so you fit it on a live line.
How It Reads The Pig
You fix the instrument to the pipe with two clamps and stick a magnet to the pig. As the pig passes, the field change trips the unit and the display shows the pass number and the time, to the minute. The device stores up to 99 passages, so a single station can log a full campaign before you read it back. The LCD has a heater for cold sites.
Power And Output
Power is flexible. Four AA cells run it standalone, or you feed 12 to 24V DC from the site. The remote leads are yellow and white for the signal and red and black for power. The unit transmits its state to an upstream system, so it fits both local reading and central alarm.
Hazardous Area Rating
The instrument is certified Ex db IIC T6 Gb with ingress protection IP66, and the rated supply is 24V DC at 3A contact. That rating lets it sit in Zone 1 gas service without extra enclosure. The clamp-on build means no breach of the pipe, which is the main safety gain over a welded or flanged detector.
Where To Use It
Pick it for live lines, for taps where welding is not allowed, and for stations that want a logged history of passes. It pairs well with a launcher or receiver where you need proof of arrival without a bore penetration. Tell EMT the pipe diameter and wall so the clamp and trigger threshold are set right.
Key Features
- No bore entry – Clamps on the pipe, no weld, no leak path.
- 99 pass log – Records number and time of each passage.
- Hazardous rated – Ex db IIC T6 Gb, IP66 for Zone 1 gas.
- Dual power – Battery or 12-24V DC site supply.
- Remote output – Transmits state to an upstream system.
- Heated LCD – Reads clearly in cold service.
Specifications
| Attribute | Value |
| Type | Non-intrusive, magnetic induction |
| Mount | Two clamps on pipe outer wall |
| Memory | 99 passages with time |
| Display | LCD with heater |
| Power | 4x AA battery or 12-24V DC |
| Ex marking | Ex db IIC T6 Gb |
| Ingress | IP66 |
| Contact | 24V DC, 3A |
| Remote leads | Red/black power, yellow/white signal |
FAQ
Does it need a weld or a flange?
Neither. It clamps to the pipe wall and reads the magnet on the pig, so it fits a live line with no bore penetration.
How many passes does it store?
It logs up to 99 passages with the time of each, which covers a full pigging campaign before you read the data back.
Is it safe in a gas area?
Yes. It is certified Ex db IIC T6 Gb with IP66 and runs on 24V DC at 3A contact, so it sits in Zone 1 without an extra enclosure.
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