UTM20 Series

Ultrasonic Transit-time Flowmeters

The Spirax Sarco UTM20 ultrasonic transit time flowmeter measures volumetric flow and heating/cooling energy rates in clean liquids as well as those with small amounts of suspended solids or aeration, such as surface water or raw sewage.
UTM20 flow and energy meters clamp onto the outside of pipes and do not make contact with the liquid inside the pipe

By clamping onto the outside of pipes, the meters have inherent advantages over other flow meter technologies, including:

  • Reduced installation time and cost
  • Non-invasive, non-contact measurement
  • Continued operation during installation – no need to shut down the process
  • No pressure head loss
  • No moving parts to maintain or replace
  • Large, bi-directional flow measuring range
  • Data log up to 8 records
  • Modbus® RTU or BACnet® MS/TP over EIA-485; Modbus TCP/IP; BACnet/IP
  • Configure and troubleshoot over USB with SoloCUE software
  • Reynolds number, ultrasonic speed and temperature compensation
  • Large, easy-to-read graphical display
  • Rugged, aluminum enclosure for a long service life in harsh environments

The UTM20 meter is available in a variety of configurations that permit the user to select a meter with features suitable to meet particular application requirements.
The UTM20 meter is available in two versions:

  • A volumetric flow meter for water, sewage, cooling water, water-glycol mixtures, alcohols and chemicals.
  • A heating/cooling energy flow meter used in conjunction with dual clamp-on RTDs for temperature measurement; ideal for hydronic process and HVAC applications.

Transit time flow meters measure the time difference between the travel time of an ultrasound wave going with the fluid flow and against the fluid flow.
The time difference is used to calculate the velocity of the fluid traveling in a closed-pipe system.
The transducers used in transit time measurements operate alternately as transmitters and receivers.
Transit time measurements are bi-directional and are most effective for fluids that have low concentrations of suspended solids and are sonically conductive.
UTM20 Series
An ultrasonic meter equipped with heat flow capabilities measures the rate and quantity of heat delivered or removed from devices such as heat exchangers.
By measuring the volumetric flow rate of the heat exchanger liquid, the temperature at the inlet pipe and the temperature at the outlet pipe, the energy usage can be calculated.

Liquid Types Most clean liquids or liquids containing small amounts of suspended solids or gas bubbles
Flow Accuracy Medium and Large Pipes (RZ, NZ, WZ, HZ, LZ, YZ, JZ, KZ) ± 0 5% ± 0 0 049 ft/s (0 015 m/s)
Small Pipes (CA-CT, UZ) 1 in (25 mm) and larger = ±1% ± 0 03 ft/s (0 009 m/s) 3/4 in (20 mm) and smaller = ±1% of full scale
Repeatability 0 2% above 1 5 ft/s
Velocity Medium and Large Pipes Up to 40 ft/s, depending on pipe and fluid
Small Pipes Up to 20 ft/s, depending on pipe and fluid
Straight Run Requirements 10 diameters upstream, 5 diameters downstream from single elbow
Certification and Compliance General Safety (all models):
cCSAus, CE, Pollution Degree 2, CE compliance to Low Voltage Directive, 2014/35/EU

U.S./Canada Hazardous Location transmitter and transducers: Transmitter and transducers (certification option B): cCSAus Class I Division 2 Groups ABCD T4 Volumetric Flow Meter Only (not available for Energy Meter)
Requires flexible conduit
Not available with UZ, HZ or JZ and KZ (Easy Rail) transducers, Auxiliary Dry Contact card

Transmitter (certification option R):
cCSAus Class I Division 2 Groups ABCD T4; cCSAus Ex ec ic nC IIC T4 Gc; Ex tc IIIB T100° C Dc; Class I, Zone 2, AEx ec ic nC IIC T4 Gc; Zone 22, AEx tc IIIB T100° C Dc; Class II, Division 2, Groups FG; Class III
Not available with Auxiliary Dry Contact card

Transducers LZ, NZ, RZ, WZ and YZ (certification option R):
cCSAus Ex ec IIC T6 Gc; Ex tc IIIB T60° C Dc; Class I, Zone 2, AEx ec IIC T6 Gc; Zone 22, AEx tc IIIB T60° C Dc; Class II, Division 2, Groups FG; Class III Requires flexible conduit Not available with CA-CT, UZ, HZ or JZ and KZ (Easy Rail) transducers

Power Options 24 Vdc/AC 9…28 Vdc @ 8 W max or 20…26 AC 47…63 Hz @ 0 5 A max , 2 Amp slow-blow fuse, not field replaceable
Mains AC 85…264 Vac 47…63 Hz @ 24VA max 1 Amp slow-blow fuse, manually field replaceable
Over-Voltage Rating Category II (CAT II)
Display Options Display with keypad or no display/keypad
Keypad 4-button navigation, keypad with tactile feedback; polyester film
Display 128 × 64 pixel LED backlit graphical display; adjustable brightness and timeout; polycarbonate window
Flow rate/total 8-digit
Enclosure NEMA Type 4X, IP67
Construction Aluminum construction; painted; wall, panel or pipe mounting; stainless steel fasteners and mounting hardware; EPDM gasket
Conduit Holes (4) 1/2 in NPT, M20 × 1 5 or 1/2 BSPP; cable glands available for NPT and M20
Environmental Ratings Pollution Degree 2
Altitude Restriction Up to 2000 m (6561 ft)
Ambient Temperature Range -4…140°F (-20…60°C)
Storage Temperature Range -40…176°F (-40…80°C)
Humidity 0…85%, non-condensing
Configuration Via optional keypad or SoloCUE configuration software; SoloCUE available on DVD or download
Units (FieldSelectable) Velocity feet/second, meters/second
Volumetric total US Gallons, Million Gallons, Imperial Gallons, Million Imperial Gallons, Acre-Feet, Liters, Hectoliters, Cubic Meters, Cubic Feet, Oil Barrels (42 gallons), Fluid Barrels (31 5 gallons), Imperial Fluid Barrels (36 imperial gallons), Pounds (Kilograms) and custom units
Flow rate Acre Feet/Day, Liters/Second, Liters/Minute, Liters/Hour, Cubic Meters/Second, Cubic Meters/Minute, Cubic Meters/Hour, Cubic Feet/Minute, Cubic Feet/Minute, Cubic Feet/Hour, Gallons/Second, Gallons/Minute, Gallons/Hour, Million Gallons/Day, Imperial Gallons/Second, Imperial Gallons/Minute, Imperial Gallons/Hour, Million Imperial Gallons/Day, Oil Barrels/Day, Fluid Barrels/Day, Imperial Fluid Barrels/Day and custom units
Energy total (energy meters) British Thermal Unit (Btu), Thousand Btu, Millions Btu, Kilocalories, Mega calories, Kilowatt-hour, Megawatt hour, Kilojoules, Mega joules, Ton-hour (Refrigeration)
Heat/cooling rate (energy meters) Btu/hour, Thousand Btu/hour, Millions Btu/hour, Ton (Refrigeration), Watts, Kilowatts, Megawatts, Kilojoules/hour, Mega joules/hour, Kilocalories/hour, Mega calories/hour
Temperature (energy meters) Farenheit, Celcius, Kelvin
Flow Meter Energy Meter
Inputs and Outputs 0/4…20 mA output One 16-bit, isolated, max 800 Ohms, internal or external power Two 16-bit, isolated, max 800 Ohms, internal or external power
Digital input One 5…30 Vdc, isolated, externally or internally sourced, reset totalizer or alarm output
Digital output Two selectable pulse, alarm, flow direction, sink isolated open collector, 5…30 Vdc, max 50 mA externally or internally sourced, leakage current 1uA max Three selectable pulse, frequency, alarm, flow direction, isolated open collector, 5…30 Vdc, externally or internally sourced, leakage current 1uA max
Frequency output: 50% duty cycle, 63…10k Hz maximum frequency
Pulse (totalizer) output: 5 kHz max output, open collector, pulse width 5…500 ms programmable
Optional: Two dry contact output for alarm or flow direction 30 Vdc max , 5A max (Ethernet not available with this option)
RTD (energy only) None Two 2-wire, 3-wire or 4-wire Pt100/Pt1000 RTD 12-bit inputs; Range of -40…200°C; Clamp-on resistor kits available
Ports Programming USB 2 0 mini B connector for connection to a device with SoloCUE configuration software
EIA-485 Modbus RTU command set or BACnet MS/TP; Baud rates 9600, 14400,19200, 38400, 57600, 76800, 115k; terminating resistor selectable
Ethernet Optional 10/100 Base T RJ45, communication via Modbus TCP/IP or BACnet/IP
Data Logging Number of points Up to 8 parameters per record Selectable 1 second to 1 day Transfer logs via memory card
Real Time Clock Backed up with a super capacitor, minimum of 32 days of data retention without power; Requires no servicing
MicroSD card slot 8 GB card, included with transmitter
Alarms Records 150 previous alarms, warnings or errors
Languages English, French, German, Italian, Spanish
Security Four levels: Read-only, Operator, Service and Admin; 6-digit passcode number; selectable auto logout
Model Construction Cable Length Max. Pipe/Tubing Sizes 1 Flow Rate Max. GPM (LPM) Pipe/Tubing Materials
CA-CT ⁵ fixed small pipe CPVC, Ultem®, Nylon cord grip, PVC cable jacket; -40…194°F 100 ft 0 5…2 in 190 See 2
UZ adjustable small pipe CPVC, Ultem, and anodized aluminum track system; Nickel-plated brass connector with Teflon insulation; PVC cable jacket, -40…194°F (-40…90°C) 100 ft (30 m) 0 5…2 in (12…50 mm) 190 (720)
NZ (IP67) standard pipe PVC, Ultem®, Nylon cord grip, PVC cable jacket; -40…194°F (-40…90°C) 300 ft (90 m) 2 5…12 in (DN65…DN300) 4000 (15,000)
RZ (IP54) standard pipe PBT glass filled, Ultem®, Nylon cord grip; PVC cable jacket; -40…250°F (-40…121°C) 300 ft (90 m) 2 5…12 in (DN65…DN300) 4000 (15,000)
JZ, KZ (IP54) standard pipe, integrated rail PBT glass filled, Ultem, Nylon cord grip; PVC cable jacket; -40…250°F (-40…121°C) 300 ft (90 m) 2 5…6 in (DN65…DN150)
2 5…12 in (DN65…DN300)
4000 (15,000)
WZ (IP68) standard pipe, submersible CPVC, Ultem, Nylon cord grip; Polyethylene cable jacket; -40…194°F (-40…90°C) 300 ft (90 m) 2 5…12 in (DN65…DN300) 4000 (15,000)
HZ high temperature PTFE, Vespel, Nickel-plated brass cord grip; FEP cable jacket; -40… 350°F (-40…176°C) 300 ft (90 m) 2 5…12 in (DN65…DN300) 4000 (15,000)
LZ (IP67) large pipe CPVC, Ultem, Nylon cord grip PVC cable jacket; -40…194°F (-40…90°C) 300 ft (90 m) 8…48 in (DN200…DN1200) 3, 4 33,000 (125,000)
YZ (IP68) large pipe, submersible CPVC, Ultem, Nylon cord grip; Polyethylene cable jacket; -40…194°F (-40…90°C) 300 ft (90 m) 8…48 in (DN200…DN1200) 3, 4 33,000 (125,000)

1 Recommendations based on unlined, new pipes with water Recommended pipe or tubing sizes vary with pipe conditions and fluid
2 PVC, CPVC, HDPE, PTFE, PDVF, stainless steel, ductile iron, aluminum, brass naval, carbon steel copper
3 Large pipe transducers are recommended for 8…12 in pipes if normal velocity is expected to be greater than 12 ft/s (3 6 m/s)
4 Consult factory for larger pipe sizes
5 Not for metric pipes

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