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Operation and Description of Instrument Function Average Temperature/Water Bottom Sensor and Converter
38 Installation and Operations Manual
VH69 Ref Voltage
Item type: read and write
Default: 200
Range: 0 ~ 255
This parameter is the setpoint for the 4532 ATC power supply failure alarm. The
4532 ATC operates with a minimum 16 VDC supply voltage via the multi-drop HART
loop under normal operating conditions. The 4532 ATC transmits an error message
when the supply voltage drops below 16 VDC. The default value of 200 is equivalent to
16 VDC.
8.1.8 Temperature Adjustment: VH70 ~ VH79
VH70 Element Select
Item type: select
Range: 0 ~ 19
Allows selection of individual temperature elements for adjustment (0 = #1 element,
5 = #6 element, 19 = reference 100 Ohm resistor). Detailed values and parameters of
the selected element can be shown in:
• VH71 "Zero Adjust"
• VH73 "Temperature X"
• VH74 "Position X"
• VH75 "Resistance X"
• VH76 "Resistance Adj"
VH71 Zero Adjust
Item type: read and write
Default: 0
Range: -1000.0 ~ 1000.0
Zero adjustment of the individual element selected at VH70. This value can be adjusted
when the measured temperature of the selected element has a minor offset value as
compared to a precision reference thermometer.
For example: Selected element #2 indicates 25.4 °C. The reference thermometer
indicates 25.2 °C. Enter "-0.2" in VH71. Element #2 now has a constant offset applied to
the raw measurement.
VH72 Adjust Span
Item type: read and write
Default: 1
Range: 0.8 ~ 1.2
This span adjustment applies to all installed temperature elements. This parameter is
multiplied by the raw measurement for each individual element to calculate the
calculated temperature for each individual element.
Note! All of displayed individual temperature values are calculated based on the following
formula.