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Liquid Nitrogen Level Monitor (Model 729A) Specifications CONTROLS TEST/NORM-OPER/HV DISABLED Front-panel toggle switch permits normal operation when set at its center position. The switch can be set at Test to check for response of the warning indications and is spring loaded to return to the Norm-Oper position. The switch can be set at HV Disabled to provide the interlock output signal that clamps the Model 659 output at zero; this setting does not affect the alarm circuit. BALANCE ADJ Rear-panel screwdriver control adjusts the sensitivity level of the sensor and bridge circuit to determine the alarm threshold. When ordered as an integral part of a detector system, this is preset at the factory.SHIP/USE Internal slide switch accessible through the side panel. Set at Ship, the alarm circuit is not activated unless power is applied to the module. Set at Use, with no probe connected, the alarm circuit is activated as intended when power is applied to the module, providing the internal batteries are not removed. The alarm is also activated when power is not furnished from the bin to the module. INPUT SENSOR Rear-panel BNC connector accepts the cable from the sensing element. OUTPUTS INTERLOCK OUTPUT Rear-panel BNC connector for cable to the Remote Shutdown connector on the detector bias supply module such as the ORTEC Model 659. Clamps high-voltage power supply output to zero when alarm condition is present or when front-panel switch is set at HV Disabled. AUDIO ALARM Warning buzzer mounted at the center of the front panel sounds when the alarm circuit is activated.ALARM HV DISABLED Flashing red light on front panel indicates that the alarm circuit is activated. HV ENABLE Red monitor light on front panel indicates that the signal through the interlock output permits operation of the Model 659 Detector Bias Supply.ELECTRICAL AND MECHANICAL POWER REQUIRED +12 V, 100 mA; + 24 V, 20 mA, –24 V, 20 mA. (Furnished from NIM-standard bin and power supply.) Two internal nickel-cadmium rechargeable battery cells provide battery backup against power failure; the Model 729A is normally furnished with the cells installed unless otherwise indicated. WEIGHT Net 1.4 kg (3.1 lb). Shipping 3 kg (7 lb).DIMENSIONS NIM-standard single-width module 3.43 X 22.13 cm (1.35 X 8.714-in. front panel) per DOE/ER-0457T. INCLUDED ACCESSORIES A 3.66 m (12 ft) BNC coaxial cable for connecting the probe to the Model 729A is included. ACCESSORIES PROBES AND CABLE The appropriate probe for the particular cryostat/dewar combination must be ordered separately. Custom built probes and different length cable available on special request. ORDERING INFORMATION
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