JENCO 3321 User manual

Operation Manual
MODEL 3321
Microcomputer Based Conductivity/Resistivity Controller
JENCO ELECTRONICS, LTD.
MANUFACTURER OF PRECISION INSTRUMENTS

1
CONTENTS
GENERAL INTRODUCTION………………………………………..………....................2
INITIAL INSPECTION……...………………..................................................................2
USING THE JENCO MODEL 3321……......................................................................3
A. Mounting procedure.....................................................................................3
B. Front panel....................................................................................................5
C. LCD screen....................................................................................................7
D. Rear connectors...........................................................................................9
E. Measure mode.............................................................................................10
F. Setting mode................................................................................................11
G. Conductivity/Resistivity calibration mode..............................................18
H. Controlling the relays.................................................................................19
ERROR DISPLAY AND TROUBLESHOOTING……………..……….........................21
SPECIFICATIONS……………..………………………………………........................23
WARRANTY……………..………...............................................................................25

2
GENERAL INTRODUCTION
Thank you for selecting the JENCO Model 3321. The 3321 Conductivity/Resistivity
Controller is a rugged microprocessor based instrument assembled in a watertight 1/8
DIN case, designed for use in laboratories and process control applications.
The system displays Conductivity / Resistivity or Temperature status in one large LCD
screen.
The model 3321 microprocessor performs a self-diagnostic routine every time you turn
on the unit, it will provide you with basic information on the stability of the instrument.
The model 3321 is equipped with 2 control relays. All control relays are programmable
and hysteresis driven.
INITIAL INSPECTION
Carefully unpack the unit and accessories. Inspect for damages made in shipment. If
any damage is found, notify your Jenco representative immediately. All packing
materials should be saved until satisfactory operation is confirmed.

3
USING THE JENCO MODEL 3321 ERVIEW
A. Mounting Procedure
PANEL CUTOUT DIMENSIONS
45.0
1.772"
92.0 3.622"
0.813 0.032
0.61
0.024
0.00
0.000
0.000 0.000
±±
±
±
DRAWING 1
1. Make a cutout on any panel, with a
thickness of 1/16 inch (1.5mm) to
3/8 inch (9.5mm). Refer to
DRAWING 1.
DRAWING 2
2. Remove the mounting assembly
from the controller and insert the
controller into the cutout. Refer to
DRAWING 2.
Mounting Brackets

4
Panel Mounting brackets
DRAWING 3
3. Replace the mounting bracket
assembly onto the controller and
secure the controller to the
mounting panel. Refer to
DRAWING 3.
【 Note 】 :
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.

5
B. Front Panel
The front panel consists of a 4-digit LCD display and 4 keys.
mS
ATC
COND CONTROLLER 3321
1. [ MODE ] key:
1a. In the Measure mode, this key will switch the display in sequence from
Conductivity, Temperature and back to Conductivity again or from Resistivity,
Temperature and back to Resistivity again.
1b. In the Calibration/Setting mode, pressing this key for five seconds will move
you back to the previous parameter in the case when recalibration / resetting is
required.

6
2. [ UP ] key:
2a. In the Calibration mode, pressing this key will increase the numeral increment.
In the Setting mode, pressing this key will show the next possible option and
increase the numeral increment.
2b. In the Measure mode, pressing this key and [ENTER] key at the same time,
the unit will enter the Calibration mode.
3. [ DOWN ] key:
3a. In the Calibration mode, pressing this key will decrease the numeral
increment. In the Setting mode, pressing this key will show the next possible
option and decrease the numeral increment.
3b. In the Measure mode, pressing this key and [ENTER] key at the same time,
the unit will enter the Setting mode.
4. [ ENTER ] key:
In any mode where the user can change the settings, pressing this key will save
the new settings. If no change has been made then pressing this key will just lead

7
the user to the next setting.
C. LCD screen
HI1 LOW2 HI2 LOW1
uS
CAL
MAN
M
mS
ATC
1 2 3 4 5 6
1098
7
1. Major LCD display.
2. CAL – This icon will be displayed if the meter is in the Calibration/Setting mode.

8
3. HI1 & LOW1 – These icons, when displayed, indicate relay action and relay
number.
4. HI2 & LOW2 –These icons, when displayed, indicate relay action and relay
number.
5. MΩ–Unit indicator.
6. ℃–Temperature and unit display.
7. uS – Unit indicator.
8. ATC –This icon will be displayed when a temperature probe is connected.
9. MAN –This icon will be displayed if no temperature probe is not connected.
10. mS – Unit indicator.

9
D. Rear connectors
CELL 10K TH
100~230VAC
LNE
Rel 1 Rel 2
Shield
*Specify “L’ = “Live Lead” 100 to 230 VAC Volts and “N” = “Neutral Lead”
1. Connect the AC line to the rear of the instrument. The model 3321 can be used
with 100~240V AC at 50/60 HZ. Make sure the EARTH connector is connected to
the earth lead of the AC power line.
2. Connect the proper load to the output relays. Make sure that the load does not
exceed the relay rating, 5 Amp at 115VAC and 2.5 Amp at 230 VAC.

10
【 Note 】 :
(1) Make sure that the power is unplugged before wiring your probes etc.
(2) Make sure you connect the AC power cord to the correct AC terminals. Incorrect
connection may damage the unit permanently.
E. Measure mode
Turning on the unit will always display the Measure mode. This instrument is designed
to provide 2 distinct measurements: Conductivity, Temperature or Resistivity,
Temperature.
MODE
mS
ATC ATC
M
ATC ATC
MODE MODE
MODE
or
1. Conductivity – Current conductivity of the solution.
2. Resistivity –Current resistivity of the solution.

11
3. Temperature – Current temperature of the solution.
【 Note 】 :Pressing [MODE] key in the Measure mode will cycle the display between
the two modes above.
F. Setting mode
Pressing [DOWN] key and [ENTER] key at the same time, the meter will enter into the
Setting mode.
1. Temperature compensation select:
+ENTER
Temperature coefficient select
MAN
CAL
ATC
CAL
ENTER ENTER
Pressing [UP] key or [DOWN] key in this screen will cycle the display between 01
(Thermistor: 10k ohm), 02 (Manual) modes above.

12
Select the preferred temperature compensation mode, press [ENTER] key to save,
and enter the next setting screen.
2. Temperature Coefficient select:
Temperature compensation select
probe Basic cell constant select
ENTER
ENTER ENTER
CAL CAL
Pressing [UP] key or [DOWN] key in this screen will cycle the display between
E2.00, E0.00 above.
Select the preferred coefficient, press [ENTER] key to save, and enter the next
setting screen.

13
3. Probe Basic cell constant select:
Temperature coefficient select
Range select
ENTER
ENTER ENTER ENTER
CAL CALCAL
Pressing [UP] key or [DOWN] key in this screen will cycle the display from C1.00,
C0.10 to C0.01 basic cell constant above.
Select the preferred basic cell constant, press [ENTER] key to save, and enter the
next setting screen.
4. Range select:
Pressing [UP] key or [DOWN] key in this screen will cycle the display from
CF01/0.000~1.999uS/cm, CF02/0.00~19.99uS/cm, CF03/0.000~1.999MΩ,

14
CF04/0.00~19.99MΩ(Basic cell K is C0.01) or CF01/0.00~19.99uS/cm,
CF02/0.0~199.9uS/cm(Basic cell K is C0.10) or CF01/0.0~199.9uS/cm,
CF02/0~1999uS/cm, CF03/0.00~19.99mS/cm (Basic cell K is C1.00) above.
Select the preferred basic cell constant , press [ENTER] key to save, and enter the
next setting screen.
ENTER
ENTER ENTER ENTER ENTER
CAL
Relay 1 HI/LOW select
CAL CAL CAL CAL

15
ENTER
ENTER ENTER
CAL
CALCAL
Relay 1 HI/LOW select
ENTER
ENTER ENTER ENTER
CAL
CAL CAL CAL
Relay 1 HI/LOW select

16
5. Relay 1 High / Low select:
Range select
Relay 1 set point value
ENTER
ENTER ENTER
HI1CAL CAL LOW1
Pressing [UP] key or [DOWN] key in this screen will cycle the display from HI、
LOW modes above. Select the preferred mode, press [ENTER] key to save, and
enter the next setting screen.
【 Note 】 :See “H. Controlling the relays ” page.

17
6. Relay 1 set point value :
Pressing [UP] key or [DOWN] key in this screen to
adjust the value, press [ENTER] key to save, and enter
the next setting screen.
7. Relay 1 hysteresis value:
Pressing [UP] key or [DOWN] key in this screen to
adjust the value, press [ENTER] key to save, and enter
the next setting screen.
Relay 1 Hysteresis value
ENTER
uS
ENTER
CAL
Relay 1 HI/LOW select
Relay 2 HI/LOW select
Relay 1 set point select
ENTER
uS
CAL
ENTER

18
8. Relay 2 High / Low select:
Same as “Relay 1 work way select”
9. Relay 2 set point value:
Same as “Relay 1 set point value”
10. Relay 2 hysteresis value:
Same as “Relay 1 hysteresis value”
G. Conductivity/Resistivity Calibration mode
The model 3321 uses 1-point calibration for conductivity or resistivity.
In the Measure mode, pressing [UP] key and [ENTER] key at the same time to allow
the meter to go to the Conductivity / Resistivity calibration mode.
At the Conductivity / Resistivity calibration mode, the “CAL” icon and a
conductivity/resistivity reading will display. Rinse the conductivity probe in distilled
water and immerse it into the standization solution. Allow temperature reading to
stabilize, press [UP] key or [DOWN] key to change this reading to that of the

19
standization solution value, then press [ENTER] key to save. Calibration is now
completed.
H. Controlling the relays
1. Isolation voltage:
The maximum isolation voltage of the relay output contacts is 1500 VDC. The
voltage differential between the relay output contacts and the load should not
exceed 1500 VDC.
2. Output load:
The current through the relay output contacts should not exceed 5 Amp at 115
VAC and 2.5 Amp at 230 VAC in order not to cause permanent damage to the
relay contacts. This rating is specified for resistive loads only.