GF Signet 3719 pH_ORP Wet-Tap - Manual (Page 4)

4 Signet 3719 pH/ORP Wet-Tap
Pull the locking shroud straight up until
both O-rings are fully seated inside the
retraction housing. Grasp the retraction housing below the locking
shroud; turn the locking shroud
1 /
4
-turn clockwise. 1 2
The 3719 is packaged with no electrode installed, and with the electrode piston in the fully inserted position.
•
Examine the female threads at the top of the electrode piston. Do not install electrode if threads are damaged.
• Examine the two O-rings at the lower end of the assembly. Do not install if O-rings are missing or there are any
signs of damage.
• Lubricate O-rings with a non-petroleum based, viscous lubricant (grease) compatible with the system.
• The pipe can be pressurized after completion of step 4.
• DO NOT ATTEMPT TO REMOVE THE RETRACTION HOUSING FROM A PRESSURIZED PIPING SYSTEM!
5.4 Installation (Wet-Tap Into Fitting)
5.2 Installation in Pipe Sizes 2.5 to 12 Inches
• For reliable in-line measurements of pH and ORP, it is
imperative to position the electrode tip into the process
stream.
• Because of its compact “short stroke” design, the 3719
requires low-profi le fi ttings to ensure proper positioning in
pipe sizes DN65 to DN300 (2.5 to 12 inches).
• It is strongly recommended to use low-profi le PP clamp-
on saddle fi ttings (customer-supplied).
• Choose the 3719 version (-11 or -21) appropriate to the size
of the branch connection of the required fi tting:
Use -11 for sizes DN65 to DN100 (2.5 to 4 in), and -21 for
sizes DN150 to DN300 (6 to 12 in.)
5.3 Installation in Pipe Sizes less than 2.5 Inches
• It is possible to install the 3719 into pipe sizes below
2.5 inches by creating a “fl ow cell” with standard piping
components.
• One simple solution, using a tee fi tting and reducer bushings,
is shown in the example below.
3-3719-11
pH/ORP Wet-Tap
(Fully Inserted)
• Many similar confi gurations are conceivable in a wide
variety of materials, but be very careful to verify dimensional
compatibility.
• Select an appropriate installation orientation to avoid the
entrapment of air inside the fl ow cell.
• Contact your local Georg Fischer Sales and Support offi ce
for assistance.
Lubricated O-rings
Locking Shroud
Retraction Housing
2 in. Tee
(S x S x S)
1½ in. NPT
Threads
Flush Style Reducer
Bushings (Spg x S)
2 in. x ½ in.
2 in. x ¾ in.
2 in. x 1 in.
2 in. x 1¼ in.
2 in. x 1½ in.
3-3719-11
pH/ORP Wet-Tap
Flush Style Reducer Bushing
(Spg x FT) 2 in. x 1½ in.