Can your European designed controls do the following?

Inlet curves    Most European controls have separate bandwidths to operate inlets.  There are several problems that arise out of using a separate bandwidth for inlet control, the main problem being an inability to lead and lag the inlet opening in relation to the ventilation (exhaust).  A bandwidth is a proportional correction to an error in relation to the target value (temperature setpoint).  Example: if the setpoint of a room were 20.0^oC with a ventilation (exhaust) bandwidth of 5.0^oC the exhaust would reach 100% correction at 25.0^oC. Most European controls assume the relationship between intake (inlet) and exhaust is linear; that is, 50% exhaust equals 50% intake.  In Canadian climates this is not the case.  At the start of ventilation (particularly in cold weather) we generally want to lag the intake behind the exhaust so as to create enough static pressure to cause the air to travel further along the ceiling.  This gives the incoming air more time to mix (temper) with the warmer room air before falling (cold air always settles to the bottom); if air enters the room under too little static pressure, it falls quickly and causes drafts in the pen.

The Envirotech Controls allow the user to set up an inlet curve (which adjusts the inlet position in relation to exhaust) so that at 10% exhaust there might only be 5% intake.  There are 10 steps (every 10%) which allow for correcting the intake in relation to exhaust.  Most European controls either assume the relationship is linear or you adjust the relationship with a separate bandwidth.  The problem with a separate bandwidth is that in order to lag the inlets in the winter you have to increase the bandwidth, but in the summer when you want a linear relationship of intake to exhaust you have to set the bandwidth back to the same value as ventilation (exhaust).  This means a minimum of four times a year you have to remember to set the inlet bandwidth (spring, summer, fall and winter) and this still does not adequately cover the times of the year when temperature is warm during the day and cold at night.  Envirotech believes that fans should correct for temperature error and inlets should follow fans in a defined relationship which covers all aspects of exhaust, whether that is minimum ventilation or maximum ventilation, and once the relationship is set it should not have to be reset by the operator.

Inlet Stop Temperature    At extremely cold temperatures (-25.0^oC) ice can form at the leading edge of an intake when inlets bring air directly into a warm moist room (a well-constructed inlet will have an insulated door which reduces the problem, but no amount of insulation will eliminate the problem).  Ice does not necessarily form evenly on the leading edge of inlets, so that when an actuator calls for an intake to open or close the ice forms a blockage that causes each inlet control line to come out of adjustment.  An inlet stop temperature looks at the outside temperature and prevents the intake from moving until the temperature is above that value. 

Example: if ice forms in a Finisher room at -25.0^oC the operator sets the inlet stop temperature a few degrees higher at –22.0^oC.  When the outside temperature reaches the –22.0^oC the inlet will stop at its present position (usually the inlet minimum position).  As long as the outside temperature is lower than –22.0^oC the inlet will not attempt to move, therefore not causing the inlet control lines to come out of adjustment.  When the outside temperature comes above –22.0^oC the ice melts and the intakes are able to move again.

Inlet Calibration and built-in power supply    Every Envirotech Control comes with one solid state fused 24 volt DC inlet control with built-in potentiometer feedback.  This allows the user to directly connect a 24 volt actuator without using a separate power supply, and with two available relays to operate the inlet actuator.  Relays can also be programmed to operate higher voltage actuators, but then they are not available to be used for other functions, such as fans or heaters.  The Envirotech Control is simple to calibrate and gives the installer the option of entering their own pot calibration values or auto calibration, which drives the inlet automatically to the open and closed limits and stores the pot values.  The installer can see the pot values at all times, which allows them to troubleshoot a bad potentiometer much more easily than pushing open and close buttons and checking resistance values with a multimeter.

Inlet Dump Mode    In partial slat finisher barns it is sometimes desirable to direct air to the floor in high temperatures.  During the rest of the year, however, a draft on the floor can cause problems with improper dunging patterns.  The Envirotech Control allows a producer to program a room temperature at which the inlet will go over the normal 100% opening and allow air to be directed to the floor.

Built in Heat Pad control    Every Envirotech Control comes with a built-in Heat Pad (or lamp) control which can interface directly to the Hog Hearthä master mat.  This saves the customer from having to buy a separate heat pad control and provides the option to shut down the heat pads when the room temperature reaches above a user-set value.  It can also be programmed for floor heat control instead of heat pad for gestation and breeding rooms.

Two-stage Fogging (or Drip cooling)    Using the same relay we can program the fogging control to cycle a faster on and off time when a second set temperature is reached.  Example: If the fogger is set to come on at a temperature of 35.0^oC for 5 minutes on and 10 minutes off, a second setpoint of 40.0^oC can cycle the relay for 15 minutes on and perhaps only 5 minutes off. 

Humidity sensor interlock    If a humidity sensor is used, the fogging will discontinue at a user-set humidity level.

Two-stage Minimum Fan Speed    There are times when a two-stage minimum fan speed is desirable in order to cut heating costs.  Example: the first stage minimum fan speed might be set at 15%, as long as the supplemental heat can maintain room temperature.  The second stage, or low temperature minimum, might be set at 10% so that if the heat can not maintain room temperature the fan speed will reduce to the second setpoint in order to avoid low temperature alarms.