GF Signet 2750-7 User Manual

Signet 2750-7 pH Electronics

*3-2750-7.090*

3-2750-7.090 Rev C 05/11 English

CAUTION!

• Remove electrical power from the device or transmitter before
wiring input or output connections.

• Follow instructions carefully to avoid personal injury or damage
to the electronics.

1. Description

The Signet 2750-7 pH Electronics amplify the output from the Signet 2724-00 pH Electrode and output a Digital (S3L) signal
to the Signet 8630 Chlorine Transmitter.
Features:

• Signet's patented DryLoc® connector provides quick assembly and a secure connection. Gold-plated contacts and an
O-ring seal ensure a waterproof and reliable interconnect to the sensor.

• Separate drive electronics from sensor make for easy sensor replacement without running new cable.

• DryLoc connectivity allows easy sensor removal for calibration.

2. Installation

Lubricate O-rings with a non-petroleum based, viscous lubricant (grease) compatible with the system.

English

Flow Tee Installation 4630 Flow Cell Installation

Signet 3-2727-00
Flat pH Electrode

The bottom yellow nut is
not used when using the 2750-7
pH electronics with the Signet
4630 fl ow cell.

Signet 4630 fl ow cell

Do Not Use Lubricant or Sealing Tape on Threads.
Do Not Overtighten.

CHEMICAL COMPATIBILITY WARNING

The retaining nuts of pH and ORP sensors are not designed for prolonged contact with aggressive substances. Strong acids,
caustic substances and solvents or their vapor may lead to failure of the retaining nut, ejection of the sensor and loss of the
process fl uid with possibly serious consequences, such as damage to equipment and serious personal injury. Retaining nuts
that may have been in contact with such substances, e.g. due to leakage or spilling, must be replaced.

3. Wiring
Wiring to the Signet 8630 Chlorine Transmitter

• Remove approximately 10 mm (0.4 in.) of insulation and tin each conductor before inserting into terminals.

White

Red

Black

Shield

Signal Ground

Digital (S3L) data

+5 VDC

18
17
16

• For calibration and confi guration please refer to the 3-8630 Signet Chlorine Transmitter manual.

4. Specifi cations

General

Compatible Electrode:

Signet 2724-00 Flat pH electrode

Compatible Instrument:

Signet 3-8630-3P Chlorine Transmitter

Mounting:

DryLoc connection

Materials:

®*

Valox

(PBT)

Cable:

4.6 m (15 ft) 3 conductor shielded, 22 AWG

Shipping Weight:

0.64 kg (1.41 lb)

Performance

Electronics Accuracy:

± 0.03 pH @ 25 °C

Resolution:

0.02 pH

Response Time (includes electrode response):

< 6 s for 95% of change

Operational Range:

0.00 to 14.00 pH

Electrical

Input Specifi cations:

Input Impedance: > 10
Temperature Drift: ± 0.002 pH per ºC
Input Resolution: 0.02 pH, 0.3 ºC

Output Specifi cations:

Digital (S

3

L): Serial ASCII, TTL level 9600 bps

Maximum Cable Length: 30 m (100 ft)

Environmental

Storage Temperature:

–20 °C to 85 °C (–4 °F to 185 °F)

Operating Temperature (Electronics Only):

0 °C to 85 °C (32 °F to 185 °F)

Relative Humidity:

0 to 95%, non-condensing

Enclosure Requirements:

NEMA 4X/IP65 with electrode connected

Standards and Approvals

CE
Manufactured under ISO 9001 and ISO 14001

China RoHS (Go to www.gfsignet.com for details)

11

Ω

* Valox® is a registered trademark of SABIC Innovative Plastics

96 mm
(3.78 in.)

23 mm
(0.91 in.)

61.0 mm
(2.40 in.)

Georg Fischer Signet LLC, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone]
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): [phone]
For the most up-to-date information, please refer to our website at www.gfsignet.com

3-2750-7.090 Rev C 05/11 English © Georg Fischer Signet LLC 2011