“LPHCD” Series Instrument

“LPHCD” Series Instrument
“LPHCD” Series
Instrument
1.0
Installation - Maintenance
“LPHCD” Series Instrument Installation and Maintenance manual
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“CE” referring norms
All “LPHCD” series instruments are “CE” marked
and they are consistent to the following european norms:
EN60335-1 : 1995
EN55014, EN50081-1/2, EN50082-1/2, EN6055-2, EN60555,3
Based toCEE 73/23 c 93/68 (DBT Low voltage normative)
and to 89/336/CEE (EMC Electromagnetic comatibility)
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“LPHCD” Series Instrument Installation and Maintenance manual
GENERAL DESCRIPTION
The “LPHCD”instrument is suitable in any industrial pH and conductivity control processes. Ph and
conductivity readings are showed on instrument’s display. The instrument is cased in an IP65 wall
mounting box, overall dimensions are 215x205x130mm. Instrument adjustments and display are
protected by a transparent polycarbonate cover. The instrument has a built-in “full galvanic isolation”
between pH - CD input and chart recorder output.
ELECTRICAL WIRINGS
“LPHCD” electrical wirings are placed on terminal blocks under frontal cover. Remove screws and
open it. Before to proceed unplug power supply and strictly observe the followings :
- check and ensure ground system works
- install a (0.03 A) differential breaker in case of inefficient grounding
- wire grounding before any other connection
- check and ensure that power supply is correct
Z7
LED
F1
1
2
F3
F2
3 4
5
6
7
8
9
10 11 12
J1
J2
J3
J4
J5
J6
J9
P1
J7
13 14 15 16 17 18 19 20 21 22
23 24 25 26
1-2: N, L (Neutral and Live) Power Supply 220Vac
3-4: N, L (Neutral and Live) pH output 220Vac
5-6: N, L (Neutral and Live) conductivity output 220Vac
7-8-9 : Earth
10-11-12: N.O. (10); Common (11); N.C. (12) Alarm output (free of voltage contact)
13-14-15: 13 (+12V, brown); 14(Input, black); 15 (Ground, blue) SEPR flow probe input
16-17: pH temperature compensation (ETEP probe)
18-19: conductivity temperature compensation (ECDCC probe, green and white wires)
20: ECDCC shield
21-22: conductivity probe (ECDCC probe, black and red)
23-24*: 23(+); 24(-) pH chart recorder output (4÷20 mA)
25-26*: 25(+); 26(-) conductivity chart recorder output (4÷20 mA)
*Blocks 24-26 are connected together.
F1: General protection Fuse (2A)
F2: Instrument Fuse (0,315A)
F3: Alarm contact Fuse (0,315A)
LED: Flow Led (when is on, relay output is enabled)
P1: Conductivity “zero” adjustment
“LPHCD” Series Instrument Installation and Maintenance manual
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JUMPER SETTINGS
JP1 - JP3: “No product” alarm
SETTINGS (C Closed; O Open):
“Time Delay” is the amount of time
set by user before instrument enters
in “no product” alarm mode.
O
O
Time
30’
JP2 - JP4: “Electrodes polarization”
“Electrodes polarization” is the amount of time
set by user before probes begin to measure.
This delay it is available during instrument
power up and after a “No flow alarm”.
C
C
O
JP3
C
O
C
Disable
60’
JP2
C
C
O
JP4
C
O
C
60’
10” Delay
SETTINGS
salt pump (default)
other applications
JP6: “pH SetPoint”
SETTINGS
“pH SetPoint” is the relay activation
mode with values greater or lower than the
ones displayed by instrument.
alkali pump
acid pump (default)
JP9: “mS display decimal point”
Scale of measurement.
SETTINGS
1999 uS
1,999 mS
19,99 mS (default)
4
15’
Delay
SETTINGS (C Closed; O Open):
O
O
Time
30’
JP5: “Conductivity SetPoint”
“Conductivity SetPoint” is the relay activation
on v a l u e s g r e a t e r o r l o w e r t h a n t h e
ones displayed by instrument.
JP1
“LPHCD” Series Instrument Installation and Maintenance manual
15’
Z7: “Flow settings”
SETTINGS
Flow control uses a SEPR probe or another
flow control system.
Mode1: use a flow-switch on blocks 13-14.
When this contact is closed all relays outputs
are disabled.
No Flow Control - Mode1 (default)
SEPR Probe - Mode2
Mode2: use a SEPR on blocks 13-14-15 or use
a flow switch on blocks 13-14. When this contact
is open all relays outputs are disabled.
LED (on main board): “Flow Status Activity”.
When is “on” there is flow.
JP7: “Conductivity scale”
Scale of measurement.
SETTINGS
1999 uS
19,99 mS (default)
pH ADJUSTMENTS
Once connected the pH probe to the instrument, it must be calibrated.
- Check if power supply is within ±10% of instrument’s label value.
- Connect pH probe (the one with blue cable cap) to the instrument.
- Rinse probe with water and dry it by shaking it (do not wipe it) before dip it into buffer solution. This
procedure may be helpful to avoid buffer solution contaminations.
- To obtain a reliable calibration ETE probe must have the same temperature of buffer solution. Otherwise
a 0,0037 pH-unit error (starting from 7pH) will occur for every single °C of difference.
Example: 10°C of difference at 4pH means an error of 0,111pH.
- Dip probe in a pH 7.00 buffer solution (BSB), shake and wait until instrument’s reading is stabilized. Use
a screwdriver to adjust the ZERO on front panel until instrument shows the same buffer solution value.
- Dip the pH probe in a pH 4.00 buffer solution (BSA), or pH 9.2 buffer solution (BSC), shake and wait
until instrument’s reading is stabilized. Use a screwdriver to adjust the SLOPE on front panel until
instrument shows the same buffer solution value.
- Install the pH probe in the off line probe holder. Using a PED probe holder it is possible to install
both temperature and pH probes in the same holder.
pH TEMPERATURE ADJUSTMENTS
“LPHCD” Series Instrument Installation and Maintenance manual
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“LPHCD” instrument is capable of automatic temperature compensation using an ETE probe (NTC
10Kohm at 25°C). The instrument is configured to perform automatic or fixed (default) temperature
compensation using a 10Kohm resistor on blocks 16-17.
pH SETPOINT ADJUSTMENT
Keeping pressed the “pH Setpoint” button the instrument will show the set value. To change it keep
pressed the button and rotate the “pH Setpoint” knob. When yellow LED “Setpoint” is “on” there is
current on blocks 3-4. Setpoint output has a delay of about 5 seconds before to be activated. However
there is any delay during “switching off” mode.
CONDUCTIVITY METER ADJUSTMENT
Make connections as explained in previous chapter and install the instrument. Proceed as follow to
set the probe:
1. Select the working range using JP7 and JP9 settings.
2. Clean and dry the probe electrodes and begin to turn the P1 trimmer located on main board until
the display will show 0000 mS.
3. Dip conductivity probe into a buffer solution, (example: BSE 1,413 mS - 25°C), shake it and wait
until the instrument reading will be stable. Then adjust GAIN to read on the instrument the buffer
solution value.
4. Install the probe into system or into the PED / PEA probe holder.
AUTOMATIC TEMPERATURE COMPENSATION
Temperature compensation is automatically performed by the instrument using a ECDCC probe (NTC
10K built in) temperature probe.
CONDUCTIVITY SET-POINT ADJUSTMENT
Keeping pressed the “mS Setpoint” button the instrument will show the set value. To change it keep
pressed the button and rotate the “mS Setpoint” knob. When the yellow LED “Setpoint” is “on” there is
current on blocks 5-6. Setpoint output has a delay of about 5 seconds before to be activated. However
there is any delay during “switching off” mode.
FLOW PROBE INPUT
Use this input with a SEPR probe or any other switch. The contact must be “free of voltage”. This
input works only if there is a constant signal for at least 5 seconds.
STANDBY LED
If... it’s “On and blinking”: delay mode and relays outputs are disabled.
If... it’s “On”: there is no flow and relays outputs are disabled.
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“LPHCD” Series Instrument Installation and Maintenance manual
ELECTRODE CLEANING
Clean conductivity probe every 30 days or each time the instrument reading is not accurate. Clean
graphite electrodes using a brushing paper with water.
pH PROBE CLEANING AND STORAGE
pH probe must be cleaned once per month to ensure a correct instrument functioning without slow
responses of the reading. Dip probe in HCl for 5 minutes and rinse with fresh water to clean them.
Correct probe functioning is ensured keeping them always wet. Shipping bottle solution is an ideal
enviroment for for long term storages, do not remove it until installation. Use a KCl 3M solution to wet
the probe terminals if the shipping solution is not available, for short time storages the fresh water
can be enough. Probe should be replaced in case of slow or not correct responses of the reading.
Do not use distilled water for pH probe storage. Do not wipe probes terminals.
Probes are not covered by warranty. Don’t cut or resize probe’s cable.
pH CURRENT OUTPUT
On terminals 23-24, there is a proportional current signal to display values:
0÷14pH ; 4÷20mA
Max resistance load : 330 Ohm
Output current signal has galvanic isolation with probes.
CD CURRENT OUTPUT
On terminals 25-26, there is a proportional current signal to display values:
0÷19,99mS ; 4÷20mA
Max resistance load: 330 Ohm
Output current signal has galvanic isolation with probes.
Provided accessories
N. 4 ø6 Dibbles
N. 4 4.5x40 Screws
N. 1 5x20 2A (T) fuse
N. 2 5x20 315mA (T) Slow blow fuses
N. 1 Instruction Manual
“LPHCD” Series Instrument Installation and Maintenance manual
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TECHNICAL FEATURES
Power supply :220 Vac ± 10%
Power consumption : 6 Watt
Weight : 2,5 Kg
Case : IP65
Working temperature environment : 0÷50°C
pH Section:
Reading range : 0÷14 pH
Resolution : ± 0,01pH
Input current : 20 femptoamps
Asimmetric potential compensation (Zero) : ± 2pH
Hysteresis set-point :± 0,1pH
Slope : ± 20%
Conductivity Section:
Measurement range:
0÷1,999 mS
0÷19,99 mS
Instrument resolution : Hysteresis setpoint : Temperature compensation: Measurement frequency : Gain adjustment: ± 1 µS ± 10 µS
± 1 µS ± 10 µS
3% °C
2000Hz
±20%
Technical features are subject to change without any advice.
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“LPHCD” Series Instrument Installation and Maintenance manual
“LPHCD” Series Instrument Installation and Maintenance manual
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“LPHCD” Series Instrument Installation and Maintenance manual
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“LPHCD” Series Instrument Installation and Maintenance manual
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