6
2750 DryLoc pH/ORP Sensor Electronics
Use standard installation
hardware to connect the
submersible 2750-3 or
2750-4 directly to
external equipment.
The 8052-1 NPT Mount Junction box
(or 8052-2 with EasyCal) connects
to
¾
in. pipe or conduit and provides
convenient wiring termination.
The 8050-1 Universal Mount junction
box (or 8050-2 with EasyCal)
mounts
fl
at onto a wall or can
be strapped to a post or pipe.
OR
OR
2750-3, 2750-4 Submersible Installation
• When the 2750 is powered with 5 VDC, the digital (S
3
L) serial data output is automatically selected.
• (S
3
L) data is used exclusively by Signet instruments.
• Remove approximately 10 mm (0.4 in.) of insulation and tin each conductor before inserting into connectors.
• To add the EasyCal function to the 2750-1, 2750-3, 2750-4 and 2750-7, use the 8050-2 or 8052-2 junction box.
• Connect the 2750 cable directly to digital (S
3
L) terminals.
•
8900 and 9900 users:
If this direct wiring is used, set the CALIBRATE menu to
perform Calibration at "INSTRUMENT"
• Connect the terminals as shown to any digital (S
3
L) terminals.
•
8900 and 9900 users:
If using EasyCal, set the CALIBRATE menu to either perform
Calibration at "SENSOR" or "INSTRUMENT"
• If SENSOR, use standard pH buffer values (pH 4, 7, or 10;
ORP 87 and 264 mV) to perform periodic calibration.
• If INSTRUMENT, any pH/ORP value can be used.
Digital
(S
3
L)
with no junction box
Digital
(S
3
L) with Junction box
Digital (S
3
L) Wiring
+
S
-
1
2
3
4
Black
Red
Shield
White
V+
DATA
GND
SHLD
9900 S
3
L Inputs
2750-1
1
2
3
4
+
S
-
2750-2
SW1
D1
SW2
Run
Cal
1
2
3
4
+
S
-
8050-2, 8052-2
SW1
D1
+
S
-
SW2
Run
Cal
8050-1, 8052-1
+
S
-
Optional Earth ground
½ in. NPT
threads
107 mm
(4.2 in.)
94 mm
(3.7 in.)
107 mm
(4.2 in.)
82.5 mm
(3.25 in.)
*
Fill with 75 mm to 100 mm
(3 in. to 4 in.) of sealant
*
94 mm
(3.7 in.)
Cable supplied:
5 m (15 ft)
3-con shield, 22 AWG.
• May be extended up to 305 m
(1000 ft) with current output.
• May be extended up to 305 m
(1000 ft) with Digital (S
3
L) output.
Black
Red
Shield
White
V+
DA
T
A
GND
SHLD
9900 S
3
L Inputs
Optional Earth ground
