Chapter 1. General Information
2
DewPro<Superscript>® MMR31 Installation & Operation Manual
1.2
Model Number (cont.)
1
2
3
4
5
MMR31
–
R
2
A
1
S
1 - Certification
• R. Standard Certification (not certified)
• S. Other
2 - Process Connection
•
1
. 3” diameter galvanized floor flange with 12.7 mm (½” NPT-M) compression fitting
•
2
. 3/4” NPT-M compression fitting
•
3
. 1/2” NPT-M compression fitting
•
4
. 3/4” x 16 “O” ring compression fitting (UNF thread)
•
6
. No mounting hardware
•
8
. G1/2 compression fitting (Male thread), gasket, SS ferrule
•
S
. Other
3 - Protective Cap
• A. Standard, with 100 micron sintered filter
• S. Other
4 - Enclosure Conduit
• 1. Enclosure Conduit M20 x 1.5-F with cable gland and plug
• 2. Enclosure Conduit M20 x 1.5-F with 1/2” FNPT adapter and plug
•
S
.
Other
5 - Output Configuration/Dewpoint Range
•
A
.One output 4-20 mA selectable: RH 0-100% or dewpoint 15 to +85°C (5 to 185°F), absolute humidity, mixing
ratio, no display, fault status 22 mA
•
B
.Two 4-20 mA DC output loops: 1st loop Moisture, 2nd loop temperature –15 to +85°C (5 to 185°F),
no display, fault status 22 mA
•
C
. As A, fault status hold
•
D
. As A, fault status 3.6 mA
•
E
. As B, fault status hold
•
F
. As B, fault status 3.6 mA
•
G
. As A, with integral display, user interface
•
H
. As B, with integral display, user interface
•
S
.
Other
1.3
Version Descriptions
The DewPro MMR31 mid-range moisture transmitter is available in two versions:
•
One isolated 4-20 mA current loop:
The loop current represents the selected
moisture
unit (see
•
Two isolated 4-20 mA loops:
The second loop current represents
temperature
. A unique patented feature of
this version is that both loops can be powered by a single supply.