monitor screen for liquid nitrogen (LN2) micro dosing system

As mentioned earlier with each system software is included to display "what's going on inside the system". Although each system works autonomously, a PC screen is great to understand and to see "what's going on".

When you connect your system as received to a PC with the Monitor software installed, this is the screen you'll see.

Note white area and read Switch position 5 = 2-point level control. This indicates that the internal switch is in position 5. If you change the switch position, because you want another mode, the text in the white area changes accordingly.

for future expansion

click on nr. to see the corresponding screen for each switch position

show me a specification listing of all switch positions

view all modes

the above window is what you actually will see on your PC screen (the scoll bar doesn't work in this demo but will on your PC)

view all modes starts with switch position 0 and describes all other positions

below you can click for all 16 switch positions and scroll through the entire list

time running

the time indicated is the elapsed time since the system is connected to power

the pump status (standby or sleep) has no influence on this reading

pump model nr

the model number is read from the actual pump connected, in this sample a #915-model pump

the monitor software adapts itself to the pump in question

so when in real life e.g. a #905-series pump (which has less possibilities) is connected to the PC some features as shown in this demo with a #915-pump are not applicable

the pumpstatus can be "sleep" or "standby"; the status is changed by pressing the green knob on the front

pump status

the pumpstatus can be "sleep" or "standby"; this status ic changed by pressing the green knob on the front

when in "sleep", only the risepipe freeze protection is ON, there is no further action and the status LED on the pump flashes at a very low speed

when in "standby", the pump acts according to the position of a built-in multiposition switch

to see what happens if this pump is set to "standby" move your cursor over "status" in "Pump status" observe that the status reading changes as well

pump mode

the position of a 16-position switch inside the pump housing dictates the behaviour of the system

in this demo the switch is in position 5 (2-point level control)

observe that the details of the position selected are listed in the white section (the scoll bar doesn't work in this demo but does on your PC)

after having used the system for some time, you may have forgotten what the other positions do; therefor all switch positions are described in detail under "view all modes" please realise that this data is resident in the pump itself, so you don't need a manual if the application changes and you need to adapt the behaviour of the system accordingly

all you have to do is to put the switch in another position (e.g. to change from 2-point level control to temperature control means switching from position 5 to position 8)

below you can click for all switch positions, in that overview the exact specifications of each switch position is given

pre-pressure

pre-pressure is the pressure needed to bring the liquid level inside the risepipe just under the pumphead

this value is fixed and depends on the inner height of the used dewar

+8 mBar

this value is standard factory setting for the extra pressure required for the liquid to reach the pumphead

presssure bargraphs

the left bargraph displays the required pressure

note the small blue bar

this bar grows or shrinks according to the setting of the flow potentiometer on the pumpbody, but remains steady when set

in this demo the value is 64mBar

the right bargraph dynamically displays the actual pressure inside the Dewar

in this demo the value is 55 mBar at this moment

therefor you'll always have pre-set and actual pressure next to each other in view

it is easy to see that full flow is not yet established, because the right graph is not yet at the same level as the left graph

total required pressure

is the sum of

+pre-pressure = the pressure needed to raise the liquid level inside the storage Dewar to the pumphead (here 27 mBar)

+feeding height = the pressure needed to get the liquid to the highest point in the fill line (here 8 mBar)

the value is set on a PC screen with "SET" button

after setting the value the PC is no longer needed

+required flow = value is set on the pump by numbered thumbwheel (here 37 mBar)

or by remote signal (e.g. 0-5V= or RS232)

valve display

the status of the vent valve built into the pump head is dynamically displayed

now the valve is closed; at the end of a fill cycle the valve is opened and is displayed accordingly

required pumping flow

is the setting of the flow potmeter on the pumpbody

or from external signals

dewar pressure

the reading is the actual overpressure in the bottom of the Dewar relative to the atmospheric pressure

in this demo the value is 55mBar

status LED (yellow)

blinks slowly in standby mode
blinks fast in active mode
is ON when pump is in action

extra sensor LED (bi-color)

green: sensor is warm / dry
red: sensor is cold / wet
blink: sensor is broken / shorted

main sensor LED (bi-color)

red: sensor is warm / dry
green: sensor is cold / wet
blink: sensor is broken / shorted

warning LED (red)

blink: general alarm
ON: refill vessel + every 30 sec a double beep as reminder to refill the vessel

level sensor

a level sensor inside the Dewar senses when the liquid level drops below it

if so a signal is generated and on the PC screen the green spot becomes red

this is a timely warning

usually you may continue working for at least another day before the system shuts itself off because the Dewar is empty

heater

a heater is used to generate the required overpressure

the heat capacity applied depends a.o. upon the required flow

by observing the percentage you'll quickly develop a feel of how the system performs

feeding height

this window pops up when you press the "SET" button on your PC screen

in order to compensate for major height differences in the fill line all you have to do is to type in the height difference between the pump exhaust and the highest point in the fill line

when pressing the "write in pump" button the value you have typed is written into the pump memory and you have compensated for the extra height

this setting is of interest when the fill line runs e.g. over a 2-mtr high barrier

this compensation is resident in the pump; you only need a PC to change the value

temperaure bargraphs

these bargraphs indicate the temperature of the sensors connected to the system

note the small horizontal black lines on either side of the graph

these are the setpoint indicators

these setpoint indicators are dynamic and the vertical position along the bargraph change with the application setting

note also that you actually can see that higher sensor is warmer than the lower sensor and that you can read what their respective temperature is

in addition you can also see that the higher sensor is above setpoint and the lower has not reached it's setpoint yet

total required pressure=

+pre-pressure

the pressure needed to raise the liquid level inside the storage Dewar to the pumphead

+feeding height

the pressure needed to get the liquid to the highest point in the fill line

the value is set on a PC screen with "set" button

after setting a PC is no longer needed

+required flow

value is set on the pump by numbered thumbwheel or by remote signal (e.g. 0-5V= or RS232)

in the latter case the setting on the pump itself is the maximum flow limit