ITM-4 4-Beam Turbidity Meter

Measurement of suspended solids through the use of infrared light

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The Anderson ITM-4 Turbidity meter offers precision measurement of suspended solids through the use of infrared light. Utilizing a 4-beam technology the ITM-4 has multiple emitters and receptors to produce an online, real-time measurement of turbidity that can yield information critical to both process function and product quality. The compact integral design makes installation and set-up easy. But this simplicity in design does not mean that the ITM-4 is short on features. There are standard switching and analog (4-20mA) outputs along with 4 remote selectable ranges that are available to handle different products on the same process line. Specifying the ITM-4 is easy with the line connection size as the only decision that needs to be made. Configuration is done with a simple three button navigation of the on-screen menus that makes selecting units of measure, analog output range, and switch point for your product a quick task. Most important to food and dairy processors is the robust design which offers lower cost of ownership than many other turbidity meters. The LED lamp technology provides longer life than devices utilizing tungsten bulbs and a sapphire lens is resistant to damage commonly found on other lens materials. Since this unit employs multiple beams, fouling of the optics is compensated automatically which significantly reduces the need for servicing. Most importantly the construction is the same rugged watertight stainless steel construction you have come to expect from Anderson. In fact the unit complies to the German IP69K standard which is more stringent that NEMA 4X. Whether the application involves alarming a process when signs of premature filtration failure occur or to provide constant feedback on a solids concentration to ensure product quality, the ITM- 4 offers the needed performance and durability to give years of trouble free operation.


  • 3-A Compliant; Third party verified in accordance with standard 46-03
  • 4-20 mA plus switch output
  • 4 Remote selectable ranges
  • Ranges from 0-5 NTU to 0-5000 NTU
  • 2 units (NTU and EBC) 11 ranges each


  • Whey/tower water monitoring
  • Chill water monitoring
  • Filter monitoring
  • Yeast monitoring/dosing
  • Quality control
  • Waste water control
Specifications/Spare Parts
0-100NTU ± 3%, 101-1000NTU ± 4%, 1000 - 5000NTU ± 6%, above accuracies to FNU - Formazine Scale
Operating Range
0 to 5000 NTU range, 4-20mA span selectable to 11 ranges: 0-5,10, 20, 50,100, 200,500,1000,2000,4000,5000 NTU (internally selectable), Any two remotely selectable
Ambient Temperature Limits
14 - 140° F (-10 - 60 °C)
Process Temperature Limits
32 - 212°F (0 - 100 °C)
CIP/SIP-Cleaning Temperature Limits
up to 266°F (130 °C) maximum 30 minutes
Operating Pressure
145 psi (10 Bar) maximum
Response Time
Programmable 0,1,2,4,8,16,32,64,128 sec
Supply Voltage
18-36 VDC; 160 mA maximum
Analog, 4-20mA active (scaled to measurement range)
Range Switching, E1 and E2 (24 VDC) DC decoupled
Electrical Connection
Cable Connection, 2x M12 plug-in(SS 316), (1) 4-pin, (1) 5-pin
Process Connections
ASME Sanitary Clamp
LCD-Indicator with Illumination, 2x8-digit
Fitting Materials and Finishes
SS 1.4404 (316L)
Lens Materials and Finishes
Surface Finish
32 Ra max
Optical Block Materials and Finishes
Connection Head Materials and Finishes
SS 1.4305 (303 SS) 89 mm dia.
3-A compliant
1 year
Process Fluid Requirements
Turbidity below 5000 NTU
Measuring Principle - acc. to EN 7027
4-beam alternating light, wavelength 860nm ± 60nm

Spare Parts

42117H0025 5-Conductor Molded Cordset w/25' Cable
42117H0050 5-Conductor Molded Cordset w/50' Cable
42117H0100 5-Conductor Molded Cordset w/100' Cable

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