Rosemount T56 Clarity II Turbidimeter

Complete turbidity system with Rosemount 56 transmitter (single or dual sensor), EPA 180.1 or ISO 7027 sensors, debubbler chamber, 0.001 NTU display resolution, four analog outputs, four relays, and HART.

Key advantages

0.001 NTU resolution — low stray light, bubble rejection, and stability for filtered drinking water.
EPA or ISO sensors — EPA 180.1 (incandescent) or ISO 7027 (860 nm LED); single or dual input.
Full I/O — four isolated 4–20/0–20 mA (Output 1 with HART); four Form C relays; 30-day USB data/event log.
Debubbler chamber — sample conditioning; sensors up to 50 ft (15.2 m) from transmitter.

Typical applications

Filtered drinking-water turbidity monitoring.
Wastewater discharge, condensate return, and clarifier monitoring.
Dual-point turbidity with one T56 transmitter.

Selection guide

Sensor — EPA (01/40) or ISO (02/41); one or two.
Accuracy (after cal @ 20 NTU) — 0–1 NTU: ±2% of reading or ±0.015 NTU (greater); 0–20 NTU: ±2% of reading. Sensor can read ~2–200 NTU with more cleaning.
Cable — 20 ft (6.1 m) or 50 ft (15.2 m).
Transmitter — Type 4X/IP66 polycarbonate; 85–265 Vac; ambient 0…55 °C.
Sample — 5…35 °C; max 30 psig; must drain to atmosphere.
Calibration — Order calibration cup + formazin/polymer standards separately.

Common mistakes

Ordering without a calibration cup — required to calibrate the sensor.
Choosing EPA vs ISO method incorrectly for the regulatory method in force.
Ignoring debubbler drain-to-atmosphere requirement.
Analytical / water quality

When to RFQ / what to tell us

EPA vs ISO; single vs dual sensor.
Cable length; back-plate factory-mounted option; cal cup/standards.
Power region; quantity; ship-to.

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Specs

Spec	Value
SKU	38338
Brand	Rosemount (Emerson)
Model	T56 Clarity II
Product type	turbidity measurement system
Measuring range	Display resolution 0.001 NTU; sensor accuracy specs 0–1 / 0–20 NTU (see OEM PDS)
Accuracy	0–1 NTU: ±2% of reading or ±0.015 NTU; 0–20 NTU: ±2% of reading (after cal @ 20 NTU)
Output signal	Four 4–20/0–20 mA (HART on output 1); four Form C relays
Supply voltage	85–265 Vac, 47.5–65 Hz
Ambient temperature	Transmitter 0 to 55 °C; sample/sensor 5 to 35 °C
Notes	Specs from Emerson Rosemount Clarity II T56 PDS 00813-0100-3565 Rev AC (May 2024).

Documents

FAQ

Q: EPA or ISO sensor? A: EPA 180.1 uses an incandescent source; ISO 7027 uses an 860 nm LED. Match the method required by your plant/regulator.

Q: What should I send for a quote? A: Sensor method/count, cable, cal accessories, quantity. Compatible with systems using Rosemount T56 if you need a drop-in check — we do not claim authorized-dealer status.