Panametrics DewPro MMY30, Руководство пользователя, Страница: 28 / 43

Chapter 4. Optional Display/User Interface (Option G or H)
20 DewPro
®
MMY30 User’s Manual
4.5 Functions of the Matrix
Note: Refer to Table 2 on page 18 or to Appendix A .
This section describes the functions available to the user through the programming matrix, grouped by common
function areas. The function is accessed by selecting the specified location within the matrix.
4.5.1 Display and Output Mode
4.5.1.1 Dew Point Display
4.5.1.2 Selecting the Unit of Measure
4.5.1.3 Loop at Fault
4.5.1.4 Selecting the Analog Output Offset (4 mA)
4.5.1.5 Selecting the Analog Output Span (20 mA)
4.5.1.6 Setting the Span Value for the ppm
v
Range
VH 00 This is the normal display of the transmitter when in operation. The dewpoint is shown in °C or °F, or
ppm
v
as selected under VH 01.
VH 01 Selects the units to be displayed. Changing from °C to °F does not change the current loop. Changing
from dewpoint to ppm
v
does change the current loop.
Note:
When switching to ppm
v
, the display may indicate an error “3” if the dewpoint reading is above
–20°C. (e.g., the DewPro MMY30 is exposed to ambient air.)
VH 07 If any fault malfunction occurs, the loop can be set to either “–10%” (= 3.6 mA), to “110%” (= 22 mA) or to
“Hold” (keeps at the last valid value).
VH 10 The dewpoint value corresponding to the analog output offset (4 mA) is entered here. Default: -90°C
CAUTION!
Ensure that the dewpoint value in VH10 is always at least 20°C below the value assigned
to the 20 mA value (next section below).
VH 11 The dewpoint value corresponding to the analog output span (20 mA) is entered here. Default: +10°C.
CAUTION!
Ensure the value in VH11 is always at least 20 °C above the value assigned to 4 mA.
VH 12 Selection of this field sets the span value for the ppm-v range. Default: 100.
Note:
The offset is always 0 ppm
v
. Do not exceed 1000 ppm
v
.