30119-41 Rev. 1.6/02-07
4
III. UNPACKING
. When unpacking the transmitter, any
damage due to rough or improper handling should be
reported to the transportation firm and McCrometer. If
for any reason it is determined that the unit or parts of
the unit should be returned to the factory, please con-
tact McCrometer for clearance prior to shipment. Each
unit must be properly packaged to prevent any further
damage. The factory assumes no responsibility for
equipment damaged in return shipment due to improper
packaging. Proper paperwork must be enclosed with
any returned material.
The shipping carton contains the following items:
Model TR28-2 ........................................ 1
Mounting Base O-ring ............................ 1
Mounting Base (w/hardware) ................ 1
Operation and Maintenance Manual ...... 1
IV. INSTALLATION
of transmitters is normally done at the
factory when the meter is assembled, but may be made
in the field. Depending upon what situation exists,
various steps for installation apply and the procedures
are outlined below.
V. METERS
with mechanical drive totalizers or indicator-
totalizers require a conversion kit. This kit consists of
all necessary parts to convert a mechanical drive meter
into an electronic meter. Follow the instructions in-
cluded with the conversion kit for your meter. Once
conversion is complete, follow the procedures outlined
below for installation of Model TR28-2 on an electronic
meter.
1. REMOVE
the existing digital indicator by removing
the four mounting screws. Lift the unit slightly, turn it
over, and disconnect the two lead sensor from the bot-
tom of the indicator.
2. CLEAN METER HEAD
of all dirt, glue, gaskets
and, other foreign material.
3. TRANSMITTER MOUNTING BASE (#10)
and O-
ring (#12) must be installed on the meter head. Position
the mounting base (#10) so the watertight connector
(#14) and transmitter output cable (#13) are on right
side of meter when looking upstream. Apply a small
amount of silicone grease to the O-ring (#12). Secure
base to meter with four mounting screws (#11). Con-
nect the sensor wires from the meter to the bottom of
the TR28-2. Be sure terminals are secure. The sensor
wires should pass through the hole in the base cup (#8).
(See wiring diagrams on page 10 or 11.)
4. POSITION OF INDICATOR-TOTALIZER TRANS-
MITTER
on top of the mounting base can be made in
one of four directions for the easiest possible reading.
Normally the units are attached so that they can be
read when looking upstream. Prior to mounting the
transmitter on the mounting base, the wiring connec-
tions must be made to the transmitter. Connect the
wire from the transmitter output cable (#13) to the mA
output terminal on the bottom of the unit. The output
is polarized. Be sure terminal is secure. DO NOT TOUCH
ANY OF THE OTHER TERMINALS ON THE BOTTOM OF
THE TRANSMITTER. Apply a small amount of silicone
grease to the base cup O-ring (#2) and secure transmit-
ter bonnet with four mounting screws (#3).
5. TRANSMITTER WIRING
can be accomplished by
following the wiring diagram on page 8, 10 or 11.
TRANSMITTER
OPERATION AND MAINTENANCE MANUAL
VI. MCCROMETER
products have been carefully designed
to be as maintenance-free as possible. Periodic preven-
tive maintenance, however, is highly recommended and
should be practiced according to schedule to ensure con-
tinuous accuracy and trouble-free performance of your
meter. The maintenance and inspection procedure can
also be used as a guide to locating a problem in the
transmitter that may be the cause of abnormal opera-
tion.
NOTE: METER DISPLAY WILL SHUT OFF AFTER A
FEW MINUTES WITH THE LID OPEN. TO READ
METER, CLOSE LID AND OPEN IT AGAIN.
VII. PRINCIPALS OF OPERATION
1.
The Model TR28-2 has four separate functions:
1. A 4-20 mA output signal operated through
the 24 VDC loop power from the instrument.
2. Digital display rate of flow going through the
meter.
3. Digital display of total flow that has gone
through the meter from when first installed.
4. Scaled Pulse output of one pulse per totalizer
count.
2.
A battery is built into the Model TR28-2 as a
backup for the rate and totalizer only in case of a
power failure. It should be understood how this
backup battery operates when the 24 VDC loop power
is off:
1. The 4-20 mA signal stops.
2. The digital rate and totalizer display stays on
until it goes into programmed sleep mode. (See
Programming Guide, Literature #30110-17.)
3. Because the unit has a built in EEPROM
memory, the totalizer will still be storing totalizer
information even though it is not displayed.
3.
When the power comes back on, the Model
TR28-2 will:
1. Send a 4-20 mA signal to the instrument
when flow starts.
2. It will display flow rate on the Model
TR28-2 when lid is opened.
3. It has been storing all quantity going through
the meter and will display totalizer by opening lid.
VIII. SENSOR AND TR28-2 DIGITAL INDICATOR-
TOTALIZER-TRANSMITTER
1. TR28-2 DIGITAL TRANSMITTER (#4)
should not
be removed from the meter unless battery or sensor
replacement is required or if the unit is to be repro-
grammed. If the unit must be removed, proceed as
follows:
2. TR28-2 (#4)
can be removed from the transmitter
mounting base (#10) by removing the four bonnet
mounting screws (#3).
