Description
VISATRON VN115/87-EMC is a crankcase oil mist detector
Brand: Schaller Automation (VISATRON) | Model: VN115/87-EMC Oil Mist Detector (OMD)
Product Title & Description
The VISATRON VN115/87-EMC is a crankcase oil mist detector, designed for four-stroke marine / industrial diesel engines. It continuously samples crankcase gas and optically measures oil mist opacity. When dangerous oil mist concentration is detected, it triggers pre-alarm and main alarm signals for slowdown or engine shutdown to prevent crankcase explosion. Widely used on merchant ships, power plant diesel gen-sets, offshore engine units. It is the EMC enhanced version of VN/87 series, replaced later by VN115/87plus.
Core Product Overview
VN115/87-EMC adopts optical opacity measurement principle. It uses single suction pipe sampling for 4-stroke engine crankcase compartments. The built-in measuring head contains light emitter & receiver; oil mist particles attenuate light beam, the controller calculates mist density. It has pre-alarm (70% of main alarm threshold) and main alarm relay outputs. EMC enhanced hardware for strong electromagnetic interference environments on vessels and power stations. It has self-test function, wire-break monitoring and LED status bar for local fault indication. When oil mist rises above threshold, relay contacts activate to send trip signal to engine safety control system. It complies with IACS UR M10 marine classification rules.
Product lifecycle note: VN115/87-EMC was phased out, succeeded by /87plus. It is now mainly available as spare, reconditioned or exchange unit for legacy engine retrofit/maintenance.
VN115-87-EMC
Main Technical Specifications
- Manufacturer: Schaller Automation (Germany, VISATRON brand)
- Model: /87-EMC
- Type: Crankcase Oil Mist Detector (OMD)
- Target application: 4-stroke diesel engines, single-tube sampling design
- Measuring principle: Optical opacity measurement
- Power supply: 24VDC
- Alarm: Pre-alarm + Main alarm relay dry contact output
- Diagnostics: Cable break monitoring, internal self-test, LED status indicator
- Protection class: IP54
- Operating temperature: 0℃ ~ +70℃
- Storage temperature: -25℃ ~ +80℃
- Approvals: DNV, LR, BV marine class certification, IACS UR M10
- EMC: Enhanced EMC performance for marine high EMI environment
Quality Control Procedures
Schaller oil mist detectors comply with ISO9001 and marine classification standards.
- Incoming inspection: optical sensor, light source, relay circuit, sampling pump screening.
- Assembly with unique serial number for full traceability.
- Functional test: optical calibration, alarm threshold test, self-test, wire break simulation, relay output verification.
- Environmental screening: temperature cycling, vibration, EMC interference test for marine environment.
- Final inspection & packing: visual inspection, anti-static packaging with factory test certificate.
Brand Related Matching & Replacement Models
- VN115/87plus: Direct successor replacement model
- VN116/87-EMC / VN215/87-EMC: 2-stroke engine versions of same VN/87 EMC family
- Measuring head 10601: core spare part for VN115/87-EMC
- Flexible bellow, gaskets, sampling hose: consumable spares for sampling pipeline
- Engine safety PLC / governor: Woodward 8200-1301, GE Mark VIe for engine protection interlock
FAQ
Q1: What engine type is /87-EMC for? A1: Designed for 4-stroke diesel engines, single suction pipe sampling. VN116/215 series for 2-stroke engines.
Q2: What risk does it protect against? A2: Crankcase oil mist explosion. When bearing failure creates heavy oil mist, it sends alarm and engine slowdown/shutdown signal.
Q3: Is /87-EMC still in production? A3: Discontinued. Replaced by /87plus. Now sold as new old stock, refurbished or exchange spare for existing vessels/gensets.
Q4: What output signals does it provide? A4: Dry contact relay outputs: pre-alarm and main oil mist alarm, plus cable break fault monitoring.
Q5: Warranty for VISATRON /87-EMC? A5: Refurbished/NOS unit carries 12-month warranty under proper installation and operating conditions.
Installation & Configuration Guide
7.1 Pre-installation Preparation
Verify /87-EMC unit, inspect measuring head, LED indicator and pipe ports. Prepare sampling pipeline, G1/2 fittings, flexible hoses, 24VDC power, shielded alarm cables. Isolate engine and power before installation.
7.2 Installation Steps
Mount detector in engine room suitable location. Route sampling pipe from crankcase compartments to detector inlet, install flexible bellow and gaskets. Wire 24VDC supply and relay alarm dry contacts to engine safety system. Check pipe tightness and no leakage. Keep optical measuring head clean.
7.3 System Configuration & Commissioning
Power up unit, check green ready LED. Perform manual self-test function to verify alarm relay actuation. Check pipe siphon oil level (follow manual). Simulate oil mist test via test box, confirm pre-alarm and main alarm trigger. Verify signal transfer to engine governor/PLC. Record commissioning test report.
7.4 Maintenance & Precautions
Regularly clean optical measuring window, inspect sampling hose blockage, pipe leakage and siphon oil level. Perform self-test periodically. Do not disable alarm interlock during operation. If false alarm or no detection, check sampling pipeline clogging and optical lens contamination before replacing the detector.
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