Instruction Manual

Signet 2721 pH/ORP Preamplifi er
305 mm
/
12 in.
30 mm/
1.2 in.
43 mm/
1.7 in.
BNC
connector
1. Specifi cations
Housing material: Low density polyethylene
Electronics assembly: Epoxy encapsulated
Input Impedance: > 10
11
Ω
Operating temp.: -15 to 65 °C
Gain: X1 (unity)
Input power: ± 4.5 to ± 8 VDC, dual supply
Current consumption: < 1 mA, dual supply
mV input signal: < ± 2500 mV
2. pH Wiring
3-2721.090 Rev. F 10/12 English
*3-2721.090*
English
• 8750 terminal numbers vary depending on model number. See 8750 Instruction Manual.
• A 3 kΩ resistor (not supplied) across the T+ and T- terminals of the Signet pH instrument provides a simulated temperature input that
is required for pH operation.
• A 10 kΩ resistor (not supplied) across the T+ and T- terminals of the Signet instrument initiates ORP operation.
• A shielded cable/preamplifi er enclosure is recommended for optimum performance.
Dimensions:
3 kΩ
V-
T-
10 kΩ
Signet 8750
Signet 8750
V-
V+
mV Input
Iso. Gnd
T+
T-
V+
mV Input
Iso. Gnd
T+
Bl
ac
k
Red
Brown
Green
Black
Red
Brown
Green
3. ORP Wiring
Use shielded cable for cable extensions up to 120 m (400 ft.)
Black
Red
Brown
Green
Iso. Gnd
4. Cable Extensions
China RoHS
For more information go to www.gfsignet.com