3
2750 DryLoc pH/ORP Sensor Electronics
Specifi cations
Current Output
pH ......................................... Fixed 4 to 20 mA,
isolated, 0 to 14 pH
(custom scaling available)
ORP ...................................... Fixed 4 to 20 mA, isolated,
–1000 to 2000 mV (custom scaling
available, –2000 to 2000 mV)
Power ................................... Regulated 12-24 VDC ± 10%,
20 mA max.
Max Loop Resistance .......... 50
Ω
max. @ 12V
325
Ω
max. @ 18V
600
Ω
max. @ 24V
Accuracy .............................. ±32
μ
A @ 25 ºC
Temperature drift.................. ±1
μ
A per ºC
Output resolution .................. ± 5
μ
A
Error indication ..................... 3.6 mA
Digital (S
3
L) Output:
Description ........................... Serial ASCII, TTL level 9600 bps
Power ................................... 5 VDC ± 10% regulated, 3 mA max
Accuracy:
pH ..................................... ± 0.03 pH @ 25 °C
ORP .................................. ± 2 mV @ 25 °C
Resolution:
pH ..................................... 0.01 pH
ORP .................................. 1 mV
Temp. ............................... 0.2 °C
Error indication ..................... Temp output "+999.9"
Standards and Approvals
• CE, RoHS Compliant
• Manufactured under ISO 9001 for Quality,
ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.
China RoHS (Go to www.gfsignet.com for details)
Declaration of Conformity according to FCC Part 15.
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and,
(2) This device must accept any interference received,
including interference that may cause undesired operation.
In-Line Installation Notes
In-Line Dimensions
• A Signet installation
fi
tting (12.7 mm to 101.6 mm
[
1
/
2
in. to 4 in.]) or a threaded tee is required to secure the
electrode in the pipe.
• The Signet Measurement and Instrumentation catalog offers
a complete selection of
fi
ttings.
• 2724, 2734, 2764, and 2774 series sensors thread directly
into standard 1 in. or ¾ in. NPT
fi
ttings.
1. 2750-1 and 2750-7 In-Line sensor (without EasyCal) are
designed for applications where electrode calibration is
facilitated by remote equipment. A 8050-2 or 8052-2 junction
box is required to use EasyCal with the 2750-1 or 2750-7.
2. 2750-2 In-Line sensor includes EasyCal.
3. The 2750-3 and 2750-4 submersible sensor electronics are
recommended for in-line applications using the 2764 series
differential sensors and the 2774 series Threaded DryLoc
sensors. A 8050-2 or 8052-2 junction box is required to use
EasyCal with the 2750-3 or 2750-4.
4. 2756 and 2757 Wet-Tap sensors require the 3719 Wet-Tap
assembly and can use the 2750-1, 2750-2 or 2750-7 versions.
2750-3 and 2750-4 with
2764 or 2774 sensors
3
190.6 mm
(7.5 in.)
102 mm
(4 in.)
55 mm
(2.16 in.)
2750-1, 2750-2 and 2750-7 with
3719 and 2756 or 2757 Wet Tap Sensors
4
*
*
*
83 mm
(3.27 in.)
114 mm
(4.5 in.)
248 mm
(9.75 in.)
45 mm
(1.75 in.)
2750-1, 2750-2 and 2750-7 with 272X, 273X, 2764 or 2774 sensors
1
2
94 mm
(3.7 in.)
140 mm
(5.5 in.)
229 mm
(9.0 in.)
117 mm
(4.6 in.)
* NOTE:
Lubricate O-rings with a
non-petroleum based,
viscous lubricant (grease)
compatible with the system.
*
*
*
