Gas Flow Meter Sludge Level Meter Sensor Ultrasonic Level Meter SLM600A/B PLUS Ultrasonic Level Meter SLM300C/800C Ultrasonic Level Meter SLM800S/1200S (SLM600A/B PLUS) EXPLOSION PROOF EXPLOSION PROOF ◈ ◈ Maximum sensing range : 6m SLM 600A : 3 Wire type SLM 600B : 2 Wire type ◈ ◈ Maximum sensing range : 3m/8m 2 Wire type ◈ ◈ Maximum sensing range : 8m/12m Separated type (Transducer & Monitor)