"Optics obstructed," Elias read aloud. He looked at the unit. The internal infrared sensor was blocked. It wasn't a software glitch; the machine was blind. It couldn't see the gas because it couldn't see anything at all.
4 to 20 mA analog interface alongside digital HART® communication.
Before diving into the manual, let's familiarize ourselves with the device's components:
Alignment of the transmitter and receiver can be completed by a single person using a handheld terminal, eliminating the need for alignment mirrors or telescopes. Weather Compensation: drager pulsar 7000 manual
Opening the transmitter or receiver enclosure in a hazardous area requires a hot work permit unless the circuit is proven intrinsically safe or completely de-energized.
The Dräger Pulsar 7000 manual is not just a startup guide – it is a comprehensive reference for calibration, maintenance, data management, and safety. Always keep a digital or printed copy with the instrument. For missing manuals, contact Dräger service (1-800-437-2437 in North America) with the device serial number.
| Fault | Possible Cause | Remedy | | :--- | :--- | :--- | | | Incorrect power supply, no voltage | Establish correct power supply | | "Beam Block" / signal blocked | Measuring path blocked, dirty lenses | Clear the measuring path, clean lenses, align system | | Communication impossible | Faulty connection, dead batteries in interface adapter | Replace batteries, establish correct connection | | No 4-20 mA signal | Incorrect 4-20 mA line connection, damaged DIGITAL LINK | Check 4-20 mA line, repair DIGITAL LINK | | Transmitter warning LEDs on | DIGITAL LINK interrupted, transmitter in "Fault" state | Clear causes, align system, check transmitter function | | Alignment mode points not displayed | Transmitter not active or in wrong state | Ensure transmitter is working, switch to alignment mode | | Zero calibration unsuccessful | Gas in measuring path, dirty lenses, misalignment | Remove gas from path, clean lenses, re-align system | | Persistent error | Internal fault requiring HART/PC diagnosis | Connect HART/PC to read and clear error, contact Dräger | "Optics obstructed," Elias read aloud
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Key target gases include a wide range of gaseous hydrocarbons such as .
Verify that the 4-20mA output shifts to match the expected value within the tolerances printed in the manual. It wasn't a software glitch; the machine was blind
Globally certified for hazardous areas (ATEX, IECEx, FM, CSA).
Symptom: Fault 2.0 mA (Dirty Optics) occurs constantly even after cleaning.