Features
- Programmable controller
- Manual control capability
- For portable cryostats
- Includes solenoid valve and fill
and vent lines
- Battery-backed program
- Audible alarm
- Auxiliary controlled ac circuit
Description
The 2541M LN2 Controller is designed for automatic refill of portable
cryostats that are typically used with Ge and Si(Li) Detectors. The fill
cycle is scheduled at specific times determined by the user. The fill cycle
is terminated by an overflow sensor or by a programmed fill time
interval whichever comes first. An alarm sounds if the overflow sensor
remains cold after the fill cycle is terminated, which could indicate a
frozen (open) solenoid valve. The auxiliary output provides controlled
ac power during alarm conditions.
The 2541M is factory programmed for a MACor Big MAC. The user can
change the fill time and duration without a lot of expertise in programming.
Instructions are provided for complete programming (via the
key pad). The program is battery backed for 30 days (using non-rechargeable
batteries). It should be kept under power at all times to
avoid discharging of the batteries. The 2541M comes with a detachable
3 m(10 ft) sensor cable. The solenoid valve, which has 1/4 in. NPT
fittings, comes with a captive 3 m(10 ft) power cord. Unless a LN2 supply
tank is purchased with the 2541M, the customer is responsible for
connecting the solenoid valve to his container.
The 2541M Controller requires a source of LN2 at a pressure of 34 to
172 kPa gauge (5 to 25 psig). CANBERRA D-160 and D-240 containers or
their equivalents are highly recommended. A self-pressurizing withdrawal
device (NTD-30/50) with a 30 or 50 liter Dewar can be used but it
is not recommended because of marginal capacity and pressure for
most applications. The liquid quality must be good at the point of consumption.
This means there must be no ice in the liquid and that the
supply line must not be lossy (causing excess vaporization).
An overflow container may be required if there is no safe place for the
discharge of overflow gas and liquid. WARNING: Malfunctions can result
in the entire contents of supply containers being dumped through
the system. CANBERRA takes no responsibility for such accidents. The
user is responsible for the installation and for the safety measures that
are needed in this application.
Note to our International Customers: If you
would like a quote on this product, please contact
your Local Sales Office for assistance.
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| 2541D: Dipstick LN2 Controller |
| 2541I: Integral LN2 Controller |
