Identifying Transmitter Options; Transmitter Mounting; Connection-Supported Mounting; Optional Mounting Bracket - Emerson Bristol 2808 Series Instruction Manual

4-20 mA current flowing through the resistor provides a 1-5 Vdc input for the external
device.
Amplifier circuitry contains gain and offset adjustments for setting range calibration. A
jumper selects the damping option.
At the users option, the unit may also be converted to a three-wire 1-5 Vdc output through
jumper selection.
1A.3 IDENTIFYING TRANSMITTER OPTIONS
A data plate affixed to the Transmitter body lists the model number, serial number, and
instrument range. To identify the features and options furnished with your model, refer to
the complete model number contained in the sales order. This number includes a sequence
of suffix numbers that are identified in Tables 1A-A and 1A-B. Select the appropriate table
for your model.
1A.4 TRANSMITTER MOUNTING
The Transmitter may be mounted in any position. However, when it leaves the factory it is
calibrated for operation in the upright position with the electronics enclosure at the top and
the process connection at the bottom as shown in Figures 1A-1 and 1A-2. If it is installed in
a different position, the Transmitter may require a slight zero adjustment. This procedure
is described in Section 3 - Calibration.
The Transmitter may be installed using connection-supported mounting or the optional
mounting bracket as follows:
Connection-Supported Mounting. The Transmitter provides a male pressure connection
(1/2 inch NPT for model 2808-15B and 1 inch NPT for model 2808-16B) which can also be
used for mounting purposes (Figures 1A-5 and 1A-6). This method of mounting allows the
Transmitter to be connected directly to the pressure pipe or a pipe fixture. If connection-
supported mounting is not feasible, the optional mounting bracket should be considered.
Optional Mounting Bracket. The brackets shown in Figures 1A-5 and 1A-6 can be used
when connection-supported mounting is not feasible or it is desired to mount the
Transmitter away from the process. This bracket permits the Transmitter to be clamped to
a standard 2-inch pipe with a single 2-1/4 inch u-bolt. The bracket may be positioned on the
Transmitter to accommodate either a vertical or horizontal running pipe.
1A.4.1 Transmitter Housing Rotation
Once mounted, the Transmitter Housing can be rotated up to 180° in either direction, i.e.,
clockwise or counterclockwise. The Transmitter Housing must not be rotated from its
shipped position any more than 180° clockwise or counterclockwise. CAUTION:
Transmitter will be damaged if the Transmitter Housing is rotated more than 180°
from its shipped position.
2808B GP Transmitters / 1A-3