AM-ULM-B Small Blind Area Ultrasonic Level Meter

An ultrasonic level meter times a pulse from a transducer above the liquid down to the surface and back. AM-ULM-B is the short-span version: 0–3 m, a blind zone under 0.1 m, 1 mm of display resolution and ±0.15 % in the parameter table. It is for the vessel where the useful band sits low — a collecting well, a dosing tank, a sump — and the top of the tank is close enough that a metre of dead space would swallow the alarm point.

Three metres is the whole span, so a taller tank is a different instrument rather than a setting. The datasheet also fixes the rest of the envelope: atmospheric pressure only, ambient −20 to +60 °C, IP65, a G2 process connection and an M20×1.5 cable entry. What the buyer gives up is the medium side — no wetted material, no medium temperature and no chemical-resistance data are published, so acid, alkali or high-temperature service cannot be signed off from the sheet, and foam or a churning surface leaves nothing to time.