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220 Loop Powered Level Monitor

220 Level Monitor by ContrecContrec's Model 220 Loop Powered Level Monitor accepts a 4-20mA signal from a wide range of level sensors, including pressure transmitters, ultrasonic sensors or capacitance probes, and displays both level and tank contents on a large LCD display.

The 220 is a higly accurate, intrinsically safe level monitor that has been desgined to operate with digital output flowmeters. With an IP67 weatherproof housing, new tactile keyborad and various mounting options the 220 level monitor is perfect for the most arduous of installations.

The solid state relay outputs provide up to four level alarms and a 25 point non-linearity correction table that allows the instrument to be programmed to fit most tanks. This Level Monitor is powered entirely from the 4-20mA current loop requiring no external power or batteries.

This versatile instrument is fully programmable with setup parameters such as span, offset, alarm levels, etc, stored in a non-volatile memory which will retain all data for more than 10 years without power.

A wall mounting bracket is supplied as standard, while a 2″ pipe mounting bracket is available as an option. Alternatively, the Model 220 can be supplied as a panel mount instrument. The Model 220 is housed in an attractive IP67 (Nema 4X) polycarbonate enclosure which is completely watertight. 


220 Level Monitor features

  • Non-linear Tank Correction
  • Density Correction
  • Four Level Alrams
  • Level Bar Graph Display
  • Tank Contents Display
  • Powered by 4-20mA Loop
  • Intrinsically Safe
  • Wall, Pipe and Panel Mounting
  • Watertight to IP67 (Nema 4X)
  • ATEX, IECEx, CSA Approved
  • CE Compliant


Level bar graph
Displays measured level as a percentage (0 - 100%)
7 digit numeric display of contents with programmable span. An offset can be programmed to account for conetnts remianing in the tank whne the measured level is 0%. The contents are displayed with 42 digit resolution so that larger values are displayed iwth trailing zeros (for example: 1437765 would be displayed as 1437700 and 5467289 would be displayed as 5467000)
A programmable filter will filter out fluctuations in readings caused by agitation in the tank.
Density correction is provided for level devices which are density sensitive. Should the desity change, a correction factor can be prgrammed via the front panel.


Four solid state opto-isolated DC relays arranged as high-high, hgh, low and low-low
Alarms can be programmed for continuous operation or for an acknowledge mode of operation where the display key is pressed to acknowledge and cancel the relay alarm output.
Normally energised or de-energised relay
Relays are programmable to alarm in either mode.

Non-Linearity Correction

A 25 point non-linear correction table can be programmed to handle any shaped tank. Up to 25 points on both the x and y axes can be programmed and the Model 220 will perform linear interpolation between points. The curve enables the contents of vessels, such as cylindrical tanks, bullet shaped tanks or hoppers to be displayed directly in engineering units as a volume or mass. A conversion program which runs under Windows 95 is available to calculate theoretical values for the conversion program based on tank dimensions.

Intrinsic Safety

The 220 is certified as intrinsically safe to European ATEX / IECEx standards and CSA US/C standards for both the USA and Canada (refer to specification details for more information) 


220 Loop Powered Level Monitor Specifications

Display Type
LCD Display
Level 20 segment bar graph
Level Span
0...100% proportional to input signal
For non-inverting tanks 0% is 4mA and 100% is 20mA
For inverting tanks 0% equals 20mA and 100% is 4mA
7 digits with 12mm high digits on teh LCD. Contents are displayed with 42 digit resolution and trailing zeros
Contents Span The contents span is programmable in the range of 0.000...9,999,999. The contents zero is the contents in the tank at 0% level
Decimal Points Decimal point position for contents is programmable in range of 0...3 decimal point places
Physical Operating Temperature -20°C to +60°C
Enclose Dimensions 98mm x 151mm x 43mm
Protection Sealed to Nema 4X or IP67 standards
Wall Mounting Options
Wall: Universal wall mounting bracket
Pipe: A galvanised metal bracket is available which enables the Model 220 to be attached to a 51mm (2") vertical or horizontal pipe
Panel: Supplied with mounting brackets. Terminals accessible from the rear. (Note: that the panel mount version is not watertight)
4-20mA Power Input Resolution & Linearity 0.05% of span
0.05% of span @ 25°C
0.1% (typ) of span, full temperature range
Update Time 0.5 second
Connection Two wire
Voltage Drop 2.5 volts maximum
Alarm / Pulse Outputs Type 4 x open collector outputs suitable for driving DC solenoids or external relays. The outputs provide high, high-high, low and low-low flow alarms
Switching Power 200mA. 30Vdc maximum
Saturation Voltage 0.8Vdc typical across the output in the "on" state
Isolation Outputs are separately opto-isolated
Hazards Area Approval ATEX Rating - II 2G Ex ia IIB T4 Gb [Cert No. BVS 15 ATEX E 106 X]
IECEx Rating - Ex ia IIB T4 Gb [Cert No. IECEx BVS 15.0099X]
CSA US/C Rating - Class 1, Group C & D [Cert No. 104840-5]
Intrinsically Safe Parameters Maximum Ambient 60°C
Maximum Input Parameters
4-20mA or Relays
Ui = 28V
Ii = 93mA
Pi = 653mW
Maximum Output Parameters
Ui = 28V
Ii = 93mA
Pi = 653mW
Important: Specifications are subject to change without notice


220 Level Monitor Drawings for product dimensions

Drawings for 220 Loop Powered Level Monitor by Contrec from Procon Instrument Technology