Mechanical Installation; General; Unpacking; Preparation For Installation - Emerson ROSEMOUNT 320HP Instruction Manual

High purity ph sensor
Table of Contents

Advertisement

MODEL 320HP

2.1 GENERAL

The sensor requires some customer assembly, there-
fore care should be taken that the instructions are fol-
lowed carefully to ensure all parts are properly
installed.

2.2 UNPACKING

Inspect the shipping container. If evidence of damage
is noted, contact the carrier. If no damage is evident,
open the container and inspect the sensor for damage.
Again, if damage is apparent, notify the carrier. Save
the shipping container and all packing material. This
will help prevent damage during transit should the sen-
sor ever require factory servicing.

2.3 PREPARATION FOR INSTALLATION

Prepare the sensor for installation as follows:
1. Remove the reference cell by turning it about ten
degrees clockwise and pulling it straight out. Hold
the cell in the position shown in Figure 2-1 and
remove the solid plug from the reference cell body.
Gently break away any salt crust which may have
formed around or inside the opening. Top off the ref-
erence cell with distilled water, tapping the cell gen-
tly to dislodge any air bubbles. Install the liquid junc-
tion supplied (PN 2001317). It is not necessary to
use thread sealants. Teflon tape may be used if a
loose fit is observed. The use of sticky "pipe dope"
compounds should be strictly avoided. Use care not
to get any greasy materials on the surface of the liq-
uid junction. As the plug is installed, beads of water
should appear on the surface of the liquid junction
as water is forced through the porous material. If
water beads are not present on the junction surface
the liquid junction should be replaced (PN 2001317).
2. Lubricate the o-ring on the reference cell using the o-
ring lubricant supplied (PN 2001928). Place the ref-
erence cell back on the flow cell. Rotate it counter-
clockwise until the ears seat in the retainer brackets.
3. Install sensor panel so the process flow will enter at the
bottom of the cell and exit from the top (Figure 2-2).
Make sure that the panel is securely attached to the
mounting surface.
2.3.1 Plumbing. Plumb the sensor from sample line to
discharge. Be careful not to over tighten these con-
nections. Plastic parts can be cracked by excessive
force. The distance from the sample line should be as
short as possible to minimize lag time in control appli-
cations.
SECTION 2.0

MECHANICAL INSTALLATION

FIGURE 2-1. Liquid Junction Installation
2.3.2 Electrical Installation. Figures 2-3 through 2-10
provide the guidelines for wiring the 320HP sensor to
the ABS junction box with a built-in preamplifier to var-
ious analyzer/transmitter instruments.
Refer to Figure 2-2 and proceed as follows:
1. Make sure the conduit fittings are properly attached
to the enclosure junction box.
2. Install the pH electrode into the sensor's flow cell as
shown in Figure 2-2.
3. Plug the preamplifier into the junction box.
4. Connect the pH electrode to the preamplifier.
5. Connect the temperature compensator.
6. Ensure that guard wire is connected to the stainless
steel flow cell.
7. Make the required connections to the instrument.
Use care to dress the wires so they are not exposed
and
susceptible
(Recommended cables are listed on page 2)
Do not run signal cable next to A.C. Iines.
8. Attach the junction box cover, making sure the gas-
ket seal keeps moisture out of the box.
SECTION 2.0
MECHANICAL INSTALLATION
to
shorting
or
grounding.
NOTE
3

Advertisement

Table of Contents
loading

Table of Contents