5
9900 Transmitter
Mfr. Part No. Code
Description
3-9900.395
159 001 697
H COMM Module
The H COMM Module enables communication between the 9900 and a HART
®
-enabled
device. The HART (
H
ighway
A
ddressable
R
emote
T
ransducer) Protocol superimposes digital
signals on top of the 4 to 20 mA analog signal.
Refer to the 9900 H COMM Module Instruction Sheet 3-9900.094 for further details.
NOTE:
With H COMM Module installed, a minimum of 24 V is required for loop-powered systems.
Mfr. Part No. Code
Description
3-9900.394
159 001 699
Direct Conductivity/Resistivity Module
The Direct Conductivity/Resistivity (Cond/Res) Module interfaces Signet 2818-2823 and
2839-2842 Conductivity electrodes directly to the 9900. (Conductivity/Resistivity and Salinity
measurements may also be performed via the 2850 Sensor Electronics connected through
the 9900 Digital (S
3
L) input.)
●
Provides
fi
ltering and conditioning.
●
Sensor cable length can be extended to 30 m (100 ft).
●
2839 - 2842 sensors come with a cell constant certi
fi
cate to improve the accuracy of
the sensor measurements (see page 38).
Signet Conductivity Module cannot operate when using loop power and requires an
external DC power supply to be used with the 9900 Transmitter (see Power Wiring, pg. 17).
3-9900.395
H COMM Module
DC Power
Loop V
oltage
Loop V
oltage
H COMM Module
DC Power
Cond/Res Module
SHIELD
TEMP
(WHT)
ISO GND (BLK)
SIGNAL
(RED)
HART
®
is a registered trademark of the HART Communication Foundation, Austin, Texas, USA.
Any use of the term HART hereafter in this document implies the registered trademark.
SHIELD (SIL
VER)
TEMP
(WHT)
ISO GND (BLK)
SIGNAL
(RED)
Black
Red
White
Shield
2818
Sanitary
2819-
2821
2822
2823
2839-
2842
NOTE:
The H COMM Module
can run on Loop Power.
NOTE:
The black rubber jumper adjacent to the power terminal should only be removed when both
the H COMM Module is utilized and the required sensor cable length is over 304 m (1000 ft).
See Appendix for H COMM Module Overview, Installation, Wiring, Operation,
HART Commands, and Unit Code information. (See page 64-69)
Direct Conductivity/Resistivity Module
H COMM Module