Georg Fischer Signet 2720 Operating Manual
Signet 2720 Twist-Lock pH/ORP Preamplifi er
*3-2720.090-1*
3-2720.090-1 D 8/04 English
SAFETY INSTRUCTIONS FOR IN-LINE ELECTRODE INSTALLATION
1. Do not remove from pressurized lines.
2. Do not exceed maximum temperature/pressure specifi cations.
3. Wear safety goggles or face shield during installation/service.
4. Do not alter product construction.
Failure to follow safety instructions may result in severe personal injury!
1. Wiring
Preamplifier:
pH
Electrodes:
2714
2714-HF
2716
2716-DI
ORP
Electrodes:
2715
2717
Silver (earth ground)
Brown
Blue
Green
White
Red
Black
(mV Input)
(Iso. Gnd)
(T+)
(T-)
(V+)
(V-)
ALARM 1
4
2
0
Signet
7
6
pH
5700
8
10
ALARM 2
12
14
ENTER
Preamplifier:
pH
Electrodes:
2714
2714-HF
2716
2716-DI
ORP
Electrodes:
2715
2717
Silver (earth ground)
Brown
Blue
Black
Red
Green
White
(mV Input)
(Iso. Gnd)
(V-)
(V+)
(T+)
(T-)
English
Signet
8710
ENTER
Signet
8750
Preamplifier:
pH
Electrodes:
Silver (earth ground)
Red
Black
Green
Brown
White
Blue
• Use X1 gain selection
(#10) V+
(#11) V-
(#12) T+
(#13) Ain
(#14) ISO
(#14) ISO
RLY 1
RLY 2
RLY 3
RLY 4
ENTER MOD
2714
2714-HF
2716
2716-DI
Technical Notes:
• Use 6-conductor shielded cable for cable extensions to 120 m (400 ft)
• Shield must be maintained through cable splice
2. Signet Fittings
Type Description
Plastic tees
PVC saddles
• 0.5 to 4 in.
• PVC or CPVC
• Mounts via glue-on fittings
• 2 to 4 in., use 1-7/16 in. hole in pipe
• Align wedge arrows with saddle
arrows during assembly.
pH CONTROLLER
CAL RELAY OUTPUT
Signet
9030
Preamplifier:
mV
pH
TEMP
ORP
Electrodes:
Silver (earth ground)
Red
Black
Green
White
Brown
Blue
• Use X1 gain selection
(#10) V+
(#11) V-
N/C
N/C
(#13) Ain
(#14) ISO
RLY 1
RLY 2
RLY 3
RLY 4
ENTER MOD
CAL RELAY
ORP CONTROLLER
OUTPUT
Signet
9040
mV
ORP
2715
2717
Type Description
Carbon steel
weld-on
weldolets
• 2 to 4 in, use 1-7/16 in. hole in pipe
• Remove insert before welding
• Installed by certified welder only
Carbon steel
threaded tees
• 0.5 to 2 in.
• Mounts on threaded pipe ends
Iron
• 2 to 4 in., use 1-7/16 in. hole in pipe
strap-on
saddles
Consult your local Signet distributor for additional fi tting information.
Universal
pipe adapter
for large pipes,
#P31515-OV200
• For existing pipe fittings 2 in. and up
• External 1-1/4 inch NPT male threads
3. Recommended Position
3/4 in. NPT OR
ISO 7/1-Rc 3/4
female threads
Customer supplied:
• 3/4 in. NPT nipple (male)
• J-box
• flex conduit
Customer supplied:
• 3/4 in. NPT threaded
C.
B.
D.
A.
pipe (A)
• J-box (B)
• Flex conduit (C)
• Quick release pipe
clamp (D)
• Tank flange (E)
B.
C.
A.
0
+60
-60
In-Line
Process
pipe
• Vertical (0 ) position optimum
• 3m/s (10ft/s) or less for max. performance and sensor life
4. Installation
In-line Applications
1
Preamplifier
A. O-ring lubricant
recommended
(factory applied)
C.
B. Align
marks
Hand
tighten
only!
E.
2 in.
min.
Open
tanks
Closed
tanks
Caution: If liquid level is not constant, always ensure
liquid contact with electrode tip
Submersible Applications
2
Preamplifier
A. O-ring lubricant
recommended
(factory applied)
1
Customer
supplied
pipe
C.
B. Align
marks
2
Sealant
3/4 in. NPT or
ISO 7/1-Rc 3/4
Sealant
#P31542 Sensor Cap
(purchased separately)
Fitting
inlet
3
Fill with
3 to 4 in.
of sealant
Attach 3/4 in. watertight pipe to the top of the 2720. Secure the threaded connection to prevent any leakage. For additional defense against possible accumulation of condensation at the back seal area of the sensor, fi ll the lower 3 to 4 inches of conduit or extension pipe with a fl exible sealant such as silicone.
2 Signet 2720 Twist-Lock pH/ORP Preamplifi er
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