P.O. Box 607, Orinda, CA 94563
(925) 939-8877 | fax: (925) 939-8883
|
JC Controls
P.O. Box 607, Orinda, CA 94563 (925) 939-8877 | fax: (925) 939-8883 |
FOR USE WITH :
This manual contains operational information for the JC Controls, LN2 level controllers.
Fully integrated comparitors, coupled with precision resistor, provide superior level sensing performance. Large switching hysterisis margins eliminate any possibility of solenoid or relay chatter.
Two regulated power supplies provide power for the sensor and logic circuitry, ensuring reliable operation under varying AC line and transient conditions. A dual wound transformer provides a factory configured 115/230 VAC capability for installation flexibility.
All operational controls for the LN2 level controllers are located on the front panel of the units with power, sensor and control connections at the rear. Maintenance is minimized by use of a single, printed circuit board plug in module containing all the electronic components.
Inspect the shipping container for external damage. After unpacking, inspect the instrument for any shipping damage. If visible damage exists, a claim should be filed with the carrier. When inspecting the printed circuit board it may appear that some of the components are missing. Areas without components are used for optional functions not ordered by your company. An operational check will insure that the equipment is supplied to your specifications. Details for an operational check are given in subsequent paragraphs of this section.
The control units are normally supplied completely wired but a kit can be purchased. For a kit, put a 'K' at the end of the part number.
The kit consists of the following:
One printed circuit board, complete
One set (as required) of sensors
One set mounting screws and standoffs
One, 15 pin P.C. board receptacle
One potentiometer & knob on timer models
1. Plug the unit into a 115 VAC outlet.
2. Set the power switch to the ON position and verify that the power indicator is illuminated.
3. Verify that the solenoid indicator is illuminated. This indicator should be illuminated when the sensors are not in cryogenic liquid.
4. If an alarm is installed, check that the buzzer is making noise when the alarm sensor is out of liquid. A switch is provided to turn the buzzer off.
In the manual position, the transfer line solenoid is activated, allowing the cryogenic liquid to flow into the reservoir. The liquid will continue flowing until it is manually turned off.
In the Auto position the Solenoid output is activated when the sensor is not in liquid. If the sensor is in liquid the output is off.
In the Auto position, with one sensor placed at the lower limit and the other sensor placed at the upper limit, the solenoid output is activated when the liquid level is below the lower sensor. The level will rise until it is above the upper sensor and the output will be turned off.
In the Auto position, with the sensor placed at the lower limit, the solenoid output is activated when the liquid level is below the sensor. As the level begins to rise above the sensor the timer will start. The time interval is adjustable from the front control knob, it's nominal range is 0 - 6 Min. The solenoid output will turn off when the time runs out.
In the Auto position, with the sensor placed at the upper limit, the timer will start when the liquid level is below the sensor. The time interval is adjustable from the front control knob, it's nominal range is 0 - 20 Hours. When the time runs out, the solenoid output will become activated and the level of liquid start's to rise. When the level is above the sensor the output will turn off.
All LN2 level controllers can have either a standard alarm option or a valve operator alarm option. The standard alarm is low level alarm. It is activated when the sensor is not in liquid. If a "high" alarm is custom ordered then the alarm indicates when the sensor is in the liquid.
When the alarm is activated and the alarm switch is on, you will hear a buzzer. With the switch turned off, the buzzer is off.
This option operates like the standard alarm but you also have a valve operator socket on the back panel. This socket is normally activated. When the alarm is activated the socket is turned off. The alarm switch has no effect on this socket.