The Model 950 Chilled Mirror Dew Point Hygrometer provides dew point measurement that can be displayed in units of degrees Celsius, degrees Fahrenheit, degrees Kelvin, or the actual ohms of the Platinum Resistance Temperature Detector (PRTD). Pressing the UP and DOWN arrows quickly cycles through the available units in real time. Standard features include automatic optical calibration, manual heat, manual cool, automatically calculated control parameters with optional manual user control, track and hold, clean mode, and mechanical optical calibration. The instrument is powered from a universal power supply equipped to accept 90-264 VAC, 47-63Hz. Optional equipment includes pressure regulators, particulate and coalescing filters, and a vacuum pump for conditions when the sample gas lacks sufficient pressure to move the sample through the instrument’s plumbing.
The analyzer is housed in a NEMA 1 equivalent enclosure rated for general purpose indoor use. The dew point temperature value is displayed on a 4 line by 20 character liquid crystal display (LCD) with a total height of 0.81″ (20.8 mm). The front panel also includes a membrane panel with seven buttons that provide access to the instrument’s settings.
The instrument is equipped with two alarm relays (see specifications) which are user configurable and can optionally be set for fail-safe operation. In addition to the alarm relays, the Model 950 Chilled Mirror Dew Point Hygrometer has a built-in audible alarm and two front panel light emitting diodes (LEDs) for visual indication of an alarm condition. The audible alarm can be canceled by the user, however the alarm event will still be in effect and indications of the alarm condition will still be available through the front panel LED(s) and relay contact(s) as well as RS232 serial communications. A flow meter, with or without an integrated flow control needle valve, mounted on the front panel of the instrument is optional equipment for the Model 950 Chilled Mirror Dew Point Hygrometer.
The standard Model 950 Dew Point Hygrometer comes equipped with two direct current (DC) analog outputs. These analog outputs can be independently configured for 0-20 mA or 4-20 mA. Both are independently scalable over the operating range of the instrument. Using a terminating resistor on either of these outputs can also provide any analog voltage in the range of 0-10 volts.