YSI 95 - Manual (Page 5)

YSI Incorporated Model 95 1
SECTION 1 SECTION 1 SECTION 1 SECTION 1 INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION
The YSI Model 95 Handheld Dissolved Oxygen and Temperature System is a rugged, micro-
processor based, digital meter with an attached YSI microelectrode array (MEA) dissolved oxygen
probe. The MEA sensor eliminates the need for stirring in most environmental applications
allowing measurement of DO in the field without an external stirring device. It also reduces
measurement errors caused by insufficient or inconsistent stirring.
The YSI Model 95 has the following features:
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Microprocessor control
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Minimal stirring dependence
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Low maintenance MEA DO probe
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Push-button calibration
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Cap membranes for easy membrane replacement
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Simultaneous display of temperature and DO in % air saturation or mg/L
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Automatic salinity compensation with manual entering of salinity value
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Automatic temperature compensation
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Data storage for 50 sets of readings with on screen recall
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Waterproof case (IP65)
The YSI Model 95 has a non-detachable, combination sensor available with cable lengths of 10, 25,
50 or 100 feet. The Model 95D has a detachable cable. The probe utilizes easy to install cap
membranes and the probe body has been manufactured with stainless steel to add rugged durability
and sinking weight. The silver anode of the MEA DO sensor requires no servicing for up to 10,000
hours (four years) of operation under normal operating conditions (no sulfite contamination).
The Model 95’s micro-processor allows the system to be easily calibrated with the press of a few
buttons. Additionally, the micro-processor performs a self-diagnostic routine each time the
instrument is turned on. The self-diagnostic routine provides useful information about the function
of the instrument and probe. For a list of these diagnostic codes, see Section 8, Troubleshooting.
A probe calibration/storage chamber is built into the instrument case. A small moist sponge in the
chamber provides a water-saturated air environment that is ideal for air calibration of the dissolved
oxygen probe. This chamber also provides a convenient place to store the probe when the system is
not in use. The Model 95 case is waterproof (rated to IP65) allowing operation in the rain without
damage to the instrument.
Six AA-sized alkaline batteries power the Model 95. A new set of alkaline batteries will provide
approximately 150 hours of continuous operation. When batteries need to be replaced, the LCD will
display a “LO BAT” message.
The YSI Model 95 is designed for use in environmental, aquaculture, and industrial applications
where accurate dissolved oxygen and temperature measurements are desired with minimal stirring.