HF Scientific MTOL+ Online Process Turbidimeter

Continuous nephelometric turbidity monitor for finished or raw water — EPA 180.1 white-light or ISO 7027 infrared models, patented ultrasonic autoclean, and simultaneous isolated 4–20 mA plus RS-485 Modbus.

Key advantages

Regulatory model choice — White-light cat. 28028 for USEPA Method 180.1; infrared 860 nm LED cat. 28027 for ISO 7027 / DIN 27027.
Ultrasonic autoclean — Patented optical-chamber cleaning for finished or raw-water service.
Dual process outputs — Isolated 4–20 mA and RS-485 Modbus at the same time; two programmable Form-C alarms.
Range flexibility — 0–10 NTU pre-calibrated; 0–100 and 0–1000 NTU firmware on the USB key.
Field logging / updates — USB for data download and firmware; IP65 sealing; ½ in conduit entry.

Typical applications

Drinking-water plant effluent turbidity reporting.
Filter effluent and clarifier monitoring with online NTU trending.
Raw-water intake turbidity where ultrasonic cleaning reduces optical fouling.
SCADA integration via 4–20 mA and Modbus RTU.

Selection guide

Light source — White light (28028) vs infrared (28027) per the method you must meet.
Range firmware — Keep 0–10 NTU factory config or load 0–100 / 0–1000 from USB.
Accessories — ProCal kit 39953; ultrasonic cuvette 24166S; mounting plate 28157; optional factory flow alarm.
Power — 100–240 VAC standard; 24 VDC option per OEM sheet.

Common mistakes

Ordering infrared when the plant QAPP requires EPA 180.1 white light — or the reverse for ISO 7027 sites.
Assuming 0–1000 NTU is factory-loaded — higher ranges ship as USB firmware files.
Skipping ProCal primary standards when verifying low-NTU compliance points.
Mounting outdoors without weather protection — OEM rates indoor use / IP65 instrument sealing.

When to RFQ / what to tell us

White light 28028 vs infrared 28027; target NTU range.
Need for ProCal kit, mounting plate, flow-alarm option, power cord region.
Quantity and ship-to country.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	47493
Brand	HF Scientific (Watts)
Model	MTOL+
Product type	Online process turbidimeter
Measurement	Nephelometry (90° scattered light)
Ranges	0–10 NTU pre-calibrated; 0–100 / 0–1000 NTU via USB firmware
Accuracy	2% of reading or ±0.02 NTU below 40 NTU (greater); 5% above 40 NTU
Resolution	0.001 NTU below 10 NTU (user-selectable)
Outputs	Isolated 4–20 mA + RS-485 Modbus simultaneously
Alarms	2 programmable Form-C; optional factory flow alarm
Light source	White light tungsten (28028) or IR 860 nm LED (28027)
Operating / sample temp	1–50 °C
Inlet pressure	1–101 psi (7 bar) with regulator set ≈15 psi
Power	100–240 VAC, 47–63 Hz (24 VDC option)
Enclosure	IP65; ABS; ½ in conduit

Documents

FAQ

Q: EPA or ISO — which model? A: White-light 28028 targets USEPA 180.1; infrared 28027 targets ISO 7027 / DIN 27027.

Q: Does ultrasonic cleaning come standard? A: Yes — patented ultrasonic autoclean is standard on MTOL+.

Q: What should I send for a quote? A: Light-source model, NTU range, accessories, quantity, ship-to.

Parameter	Value
Accuracy	2% of reading or +/-0.02 NTU below 40 NTU (whichever greater); 5% above 40 NTU
Type	HF scientific MTOL+ online process turbidimeter (EPA 180.1 / ISO 7027 models)
Ranges	0-10 NTU pre-calibrated; 0-100 and 0-1000 NTU firmware on USB
Measurement	90 degree nephelometry; resolution 0.001 NTU below 10 NTU
Outputs	Isolated 4-20 mA and RS-485 Modbus simultaneously
Cleaning	Patented ultrasonic autoclean of optical chamber
Alarms Enclosure	Two programmable C-form alarms; IP65 sealing; 1/2 in conduit
Light Source	White light (tungsten) cat 28028 or infrared 860 nm LED cat 28027
Operating	1 to 50 C; inlet 1-101 psi with regulator set about 15 psi; power 100-240 VAC
Document	HF scientific MTOL+ specification sheet S-HF-MTOL_Plus 2510 (watts.com / HFscientific.com)