Optional Display/User Interface
4-5
September 2005
Matrix Functions
This section describes the functions available to the user through the
matrix, grouped by common function areas (refer to Table 4-1 on
page 4-3). Each function is accessed by moving to its specified
location within the matrix.
Display and Output Mode
Table 4-2: Display and Output Mode Functions
Function
Location
Description
Dew Point
Display
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.
Selecting the
Device Unit
VH 01
Selects 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. (For example, the DewPro is
exposed to ambient air.)
Loop at Fault
VH 07
If any fault malfunction occurs, the loop can be set to either “-10%”
(=3.6 mA), to “110%” (=22 mA) or “Hold” (stays at last valid value).
Selecting the
Analog
Output Offset
(4 mA)
VH10
The dewpoint value corresponding to the analog output offset (4 mA)
is entered here. Default: –90°C
Caution:
Ensure the dewpoint value in VH10 is always at least 20°C
below the value assigned to 20 mA.
Selecting the
Analog
Output Span
(20 mA)
VH11
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.
Setting the
Span Value
for the
ppm
v
Range
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
.
Summary of Contents for DewPro MMY31
Page 5: ...Chapter 1 ...
Page 6: ...General System Information Unpacking and Inspection 1 1 Theory of Operation 1 3 ...
Page 10: ...Chapter 2 ...
Page 11: ...Installation Mounting the MMY31 cont 2 2 Wiring Configurations 2 3 ...
Page 17: ...Chapter 3 ...
Page 18: ...Troubleshooting The Loop Current is Out of Range 3 1 There Is No Current 3 1 ...
Page 20: ...Chapter 4 ...
Page 29: ...Chapter 5 ...
