Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 37)

IM 12A00A01-61E
3-32 Foundation Fieldbus
3-6�-3-1 Transducer Block PH202
Index Parameter name Factory Valid Description
Default Range
2000 BLOCK HEADER TAG: “TB” General information about the function block
2001 ST_REV - - The revision level of the static data associated with the function
block. The revision value will be incremented each time a static
parameter value in the block is changed.
2002 TAG_DESC “ “ The user description of the intended application of the block.
2003 STRATEGY 1 The strategy field can be used to identify grouping of blocks. This
data is not checked or processed by the block.
2004 ALERT_KEY 1 The identification number of the plant unit. This information may be
used in the host for sorting alarms, etc.
2005 MODE_BLK AUTO The actual, target, permitted, and normal modes of the block
2006 BLOCK_ERR - This parameter reflects the error status associated with a block. It
is a bit-string, so that multiple errors can be shown.
2007 UPDATE_EVT - The alert is generated by any change to the static data.
2008 BLOCK_ALM - The block alarm is used for all configuration error, hardware
connection failure or system problems in the block. The cause of
the alert is entered in the subcode field. The first alert to become
active will set Active status in Status attribute.
2009 TRANSDUCER_DIRECTORY A directory that specifies the number and starting indices of the
transducers.
2010 TRANSDUCER_TYPE Standard PH, ORP transducer block.
pH/ORP
2011 XD_ERROR - The error code in transducer:
- No failure,
- Electronics failure,
- I/O failure,
- Mechanical failure
2012 COLLECTION_DIRECTORY - A directory that specifies the number, starting indices and DD item
IDs of the data collection in each transducer within a transducer
block.
2013 PRIMARY_VALUE_TYPE PH pH, None Type of measurement represented by primary value.
2014 PRIMARY_VALUE - -2 to 16 Primary value of the instrument is pH.
2015 PRIMARY_VALUE_RANGE -2.00 to 16.00 -2 to 16 The pH range of the instrument. (can not change)
2016 SENSOR_TYPE_PH pH/ORP pH/ORP PH is measured with a glass- and a reference electrode.
sensor sensor Redox is measured with a metal- and a reference electrode. When
a glass, metal and ref. Electrode are combined one can measure
pH and Redox simultaneously.
2017 SENSOR_MV - - The output of the electrode in mV
2018 CAL_POINT_HI 16 -2 to 16 Highest calibration point
2019 CAL_POINT_LO -2 -2 to 16 Lowest calibration point
2020 CAL_MIN_SPAN 1 1 to 18 Minimum span between two calibration points
2021 SLOPE 100 70 to 110% Sensitivity of the glass electrode
2022 SLOPE_UNIT % % Slope is presented as percentage of theoretical slope
(59,16 mV/pH equals 100%)
2023 ZERO 0 -120 to 120 mV, A balanced electrode system gives 0 mV output at pH=7.
mV -2 to 16 pH Zero (asymmetry potential) indicates the offset in mV.
2024 ZERO_UNIT mV mV, pH As an alternative to Asymmetry Potential, the Zero point can be
used to define and calibrate the EXA pH transmitter conform to the
DIN standard for instruments No. IEC 746-2.
2025 ISOPOTENTIAL_PH 7 -2 to 16 pH This is the pH value at which the sensor has the same mV output
independent of the process temperature.
2026 SENSOR_CAL_METHOD 0 1 point, not used
2 point
2027 SENSOR_CAL_DATE - till 2104 Date the sensor was last calibrated.
2028 SECONDARY_VALUE - -30 to 140°C , Temperature value
-20 to 280 °F
3-6�-3 Transducer Block