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Janis Research offers
liquid helium and liquid nitrogen level indicators from top industry
suppliers. Model specifications are listed below. If you do not have a
preferred model, Janis will supply the indicator most appropriate for your
system.
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 Model 110A Liquid
Helium Level Meter
The low-cost Model 110A
liquid helium level meter reliably measures the helium level in a
dewar. A 3.5 inch analog display provides 0-100% liquid helium
level indication. A 0-10 V recorder output is provided on the
rear panel of the instrument. The Model 110A can be used with
any AMI liquid helium level sensor up to 60 inches in active length.
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| Model
110A Specifications |
| Input
power: |
90-132
VAC or 180-264 VAC, 50-60 Hz |
| Sensor
current: |
75
mA |
| Linearity: |
±
2% of full scale |
| Absolute
calibration: |
±
2% of full scale |
| Display: |
3.5
in. analog meter |
| Recorder
output: |
0-10
V standard (0-100 mV optional) |
| Dimensions: |
3.8"
H x 8.4" W x 10.75" D, Standard
3.5" H x
19" W x 10.75" D, Rack Mount |
| Weight: |
4.0
lbs. Standard; 4.7 lbs. Rack Mount |
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 Model 135
Sample-and-Hold Level Monitor
The Model 135 is an advanced
liquid helium level monitor which incorporates AMI's patented
sample-and-hold design with automatic helium level sensor vacuum
burnout protection. The Model 135 is ideal for operation in
systems where it is important to monitor the liquid helium level while
also minimizing the helium losses.
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| Model 135 Specifications at 25 °C |
| Level Measurements |
| Resolution: |
0.1%, 0.1 cm, or 0.1 in |
| Accuracy: |
± 0.5% of active sensor length |
| Linearity: |
± 0.1% |
| Sensor Current: |
75 mA nominal |
| Sensor Voltage: |
approx. 70 VDC for 80" active sensor length |
| Operating Parameters |
| HI and LO Alarms: |
0% to 100% adjustable |
| HI/LO Alarm Relay Contact Ratings: |
30 VAC or 60 VDC, 10 VA (up to 0.5 A max)
[normally open, closed on alarm] |
| Sample-and-Hold Period: |
0.1 to 600.0 minutes (or hours) |
| 0-10 Volt Analog Output |
| Integral Non-linearity: |
±0.012% |
| Resolution: |
16 bits |
| Total Error: |
±1.1% |
| Voltage Drift (0-10 V): |
100 ppm / °C |
| 4-20 mA Analog Output @ 24 V |
| Vext Supply Range: |
13-32 VDC |
| Integral Non-linearity: |
±0.012% |
| Resolution: |
16 bits |
| Total Error: |
±0.25% |
| Current Drift (4-20
mA): |
75 ppm / °C |
| PSRR: |
10 µA
/ V |
| Power Requirements |
| Primary*: |
100-120 or 200-240 VAC ±10% 50-60 Hz, 50 VA |
| Physical |
| Dimensions (Standard): |
97 mm H x 213 mm W x 273 mm D
(3.8" H x 8.4" W x 10.75" D) |
| Weight (Standard): |
1.8 kg (4.0 lbs) |
| Dimensions (Rack Mount): |
89 mm H x 483 mm W x 273 mm D
(3.5" H x 19" W x 10.75" D) |
| Weight (Rack Mount): |
2.3 kg (5.0 lbs) |
| Environmental |
| Ambient Temperature: |
Operating: 0 °C to 50 °C (32 °F to 122 °F)
Non-operating: -20 °C to 60 °C (-4 °F to 140 °F) |
| Relative Humidity: |
0% to 95%; non-condensing |
*Maximum active sensor length is limited to 68 inches for input line voltages below 105 VAC or 210
VAC.
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Microprocessor-based
electronics provide 0.1% readout accuracy.
Nonvolatile, read only memory maintains instrument calibration
without battery backup. Watchdog timer circuitry and low
line voltage (brownout) detector prevent microprocessor
lock-up and provide fail-safe operation.
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 Model LM-500 Liquid
Cryogen Monitor
The LM-500 Liquid Cryogen
Level Monitor is a compact instrument featuring all commonly requested
functions controlled via the front-panel keypad.
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Standard Features:
- Bright two line vacuum
fluorescent display
- Sample and hold operation
(1 min to 99 hrs)
- Sensor de-ice Cycle (LHe
only)
- Sensor calibration via
front panel menu
- Control output with high
and low setpoints (Open collector output standard, TTL output
available by changing a jumper on the circuit board)
- Audible alarm
- RS-232 interface
- Manual update or
continuous operation
- LHe sensor filament
burnout protection
- Can drive sensors up to
200 cm active
- Level indication in
centimeters, inches or percent
- Adjustable constant
current source
Optional Features:
- Option 001: Analog Output
- Option 002: IEEE-488.2
Interface
- Option 003: Two Sensor
Readout with separate High and Low controller setpoints.
Configurable to monitor either two each LHe or capacitance-based
liquid level sensors, or one of each.
- Option 004: 19" Rack
Mountable Cabinet. Up to (3) LM-500's can be mounted
side-by-side in one 3.5" high rack.
- Option 005: Line Voltage
Controller Output
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JANIS RESEARCH COMPANY, INC.
2 Jewel Drive, P.O. Box 696
Wilmington, MA 01887-0696 USA
TEL: +1-978-657-8750 FAX: +1-978-658-0349
E-Mail: sales@janis.com
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