Model 185 Liquid Level InstrumentModel 185 Liquid Level Instrument |
| Product Brochure |
The American Magnetics, Inc. (AMI) Model 185 Liquid Level Instrument (cryogen
monitor) system is an advanced, microprocessor-based solution designed to provide accurate and reliable level monitoring of virtually any cryogenic liquid.
Capacitance-based level sensing
High and low alarm functions
The Model 185 provides two independent "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 is silenced from the front panel. Alarms are front panel programmable from 0 to 100 percent of the active sensing length.
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 185 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] |
| 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, 30 VA |
| 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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