Model 186 Liquid Level Controller Model 186 Liquid Level Controller |
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| Product Brochure |
The American Magnetics, Inc. (AMI) Model 186 Liquid Level Controller (cryogen monitor) system is an advanced, microprocessor-based solution designed to provide accurate and reliable level monitoring and control of virtually any cryogenic liquid.
Capacitance-based level sensing
Automated fill and alarm functions
The Model 186 fill control and alarm functions are front panel programmable from 0 to 100 percent of the active sensing length. Two independent control band setpoints, "A" and "B", activate a power receptacle on the rear panel. When the liquid level drops below the "B" setpoint, the power receptacle is energized and remains energized until the liquid level rises to the "A" setpoint. The Model 186 also provides a fail-safe timer feature that automatically de-energizes the power receptacle once a user programmed maximum time interval of up to 600 minutes is reached. The Model 186 is ideal for unattended systems where automated fill is required.
In addition, the Model 186 provides "High" and "Low" alarm setpoints to activate front panel LED warning indicators and rear panel relay outputs in the event of an overfill or liquid loss condition. The "Low" level alarm also energizes an audible warning which can be silenced from the front panel.
Convenient display
The instrument is equipped with a 4-digit LED display which provides liquid level indication in inches, centimeters, or percent as selected by a front panel switch. A front panel switch allows the user to easily adjust the instrument's length setting for a specific active sensor length. The sensor active length can be entered in either inches or centimeters.
Remote monitoring or control
The Model 186 can be provided with an optional 0-10 volt DC signal on the rear panel of the instrument for use with a recorder. A 4-20 mA current loop option is available in lieu of the voltage signal. Computer interface options, including RS-232 Serial Port/Data Logger or IEEE-488, are also available.
| Level Measurements | |
| Resolution: | 0.1%, 0.1 cm, or 0.1 in |
| Linearity: | ± 0.1 % |
| Maximum Length Readout: | 650.0 cm (255.9 in) |
| 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] |
| A and B Control Setpoints: | 0% to 100% adjustable |
| Controller Output: | AC line voltage @ 2A max current |
| Fill Timer: | 0.1 to 600.0 minutes |
| 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 |
| Maximum Load: | 4 mA (2.5 kW @ 10 V output) |
| 4-20 mA Analog Output @ 24 V | |
| Vext Supply Range: | 13-32 VDC |
| Voltage Compliance: | Vext - 3.5 |
| Integral Non-linearity: | ± 0.012 % |
| Resolution: | 16 bits |
| Total Error: | ± 0.25 % |
| Current Drift (4-20 mA): | 75 ppm / °C |
| PSRR: | 10 mA / V |
| Power Requirements | |
| Primary: | 100-120 or 200-240 VAC ±10% 50-60 Hz, 2.2 A |
| Physical | |
| Dimensions (Standard): | 97 mm H x 213 mm W x 282 mm D (3.8" H x 8.4" W x 11.1" D) |
| Weight (Standard): | 1.6 kg (3.6 lbs) |
| Dimensions (Rack Mount): | 89 mm H x 483 mm W x 282 mm D (3.5" H x 19" W x 11.1" D) |
| Weight (Rack Mount): | 2.0 kg (4.3 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 |
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.
Rev. 2 Model 185/186 Manual in Adobe Acrobat 3.0 format (834 KB)
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