Gammon GTP-9330 Series, GTP-9330-1, GTP-9330-1A, GTP-9330-101 Installation And Operation Manual

INSTRUCTION 6414

REVISED 6/20/18

Page 1 of 4

GAMMON TECHNICAL PRODUCTS, INC.
INSTRUCTIONS: INSTALLATION AND OPERATION
ONE-CC WATER PROBE
GTP-9330

GENERAL DESCRIPTION

This instruction is for the installation, operation, and testing of GTP-9330 series water detection
probes. This is a single level water detection probe.

INSTALLATION

It is the customer’s responsibility to select an appropriate weathertight and/or explosion-proof
control box containing an intrinsically safe barrier relay (IS relay). We recommend our GTP­1750 systems described in Bulletin No.67.

1. Install the new probe in a ¾” NPT

threaded fitting using Teflon thread
sealant on the threads. A 1 ½” NPT
model is also available. It may be
oriented horizontal or vertical, as
long as any water present in the drain
pipe and fittings will be removed
when the manual drain valve is
operated.

INSTRUCTION 6414

REVISED 6/20/18

Page 2 of 4

GAMMON TECHNICAL PRODUCTS, INC.
INSTRUCTIONS: INSTALLATION AND OPERATION
ONE-CC WATER PROBE
GTP-9330

2. Make an electrical connection to the

L-type conduit body mounted on the
side of the GTP-9330 probe
assembly.

3. Connect the black wire from the

GTP-9330 probe to a ground wire
using a wire nut. The yellow wire
connects to the intrinsically safe
power wire.

Note: The IS relay may be wired by the
installer to the deadman system to stop
fuel flow, provide an audible warning,
and/or provide a visual signal such as a
red light labeled “water in sump.”

OPERATION

The GTP-9330 will constantly monitor for presence of water. Function of the probe can be tested
using the following procedure while the fuel system is in operation.

1. Remove the large gold-colored

aluminum cap from the probe
housing. This causes the internal
mechanism to shift into the test
position.

2. The test water injection pump has

two sections; a cylinder and piston.
Rotate both sections together ¼ turn
counterclockwise and then pull to
remove the entire pump assembly.

INSTRUCTION 6414

REVISED 6/20/18

Page 3 of 4

GAMMON TECHNICAL PRODUCTS, INC.
INSTRUCTIONS: INSTALLATION AND OPERATION
ONE-CC WATER PROBE
GTP-9330

3. Separate the 2 sections of the pump

by unscrewing the piston (insulated
by heat shrink) from the hardcoat
anodized cylinder.

4. Hold the cylinder vertically in one

hand with the small end down and
resting on a finger tip. Fill the
cylinder to the top with clean water.
DO NOT USE DISTILLED OR
DEIONIZED WATER.

5. Insert the piston and rotate until the

first thread is engaged. There is now
1 cc (1 ml) of water in the cylinder
for performing the test.

6. Insert the small end of the cylinder to

connect it to the probe assembly and
rotate both halves of the water
injection pump clockwise to engage
the bayonet pin.

CAUTION: NEVER ATTACH THE
WATER PUMP IF THE PISTON IS
NOT INSTALLED. FUEL WILL
BE RELEASED.

7. Rotate the piston (section insulated

with heat shrink) clockwise rapidly
to inject one cc of water into the

probe. If a “water in sump” signal is

received, the probe is operating
correctly. In some cases, a second
injection may be necessary. If the
signal is not received, the probe has
failed the test.

INSTRUCTION 6414

REVISED 6/20/18

Page 4 of 4

GAMMON TECHNICAL PRODUCTS, INC.
INSTRUCTIONS: INSTALLATION AND OPERATION
ONE-CC WATER PROBE
GTP-9330

8. For winter operation and extremely cold climates, it is possible that the test water that is

inside the probe will freeze. To prevent such a problem, follow this procedure:

a. After the test described above, remove the injection pump by rotating it

counterclockwise to disconnect the bayonet pin. See “Step 2” above. Disassemble
the pump and then fill the cylinder with fuel instead of water.

b. Insert the piston and rotate it into the first thread of the cylinder as in “Step 5”

above.

c. Insert the small end of the cylinder to the probe and rotate in ¼ turn to engage the

bayonet pin as in “Step 6” above.

d. Rotate the piston all the way in to displace residual water and fill the passageways

with fuel.

9. After testing is complete, be sure the water pump is installed with the piston turned all the

way in. Attaching the large aluminum cap automatically forces the internal mechanism
out of the testing position and into the operating position.

DISCUSSION

Depending on design of the IS relay circuit, water detection may cause the fuel pump to stop or a
flow control valve to close. It may also cause a warning horn to be energized, a red light to turn
on, or other signals to be energized.

PARTS

1. GTP-9330-1

2. GTP-9330-1A

3. GTP-9330-101