IM 12B6B3-E-H
Specification 2-1
2. PH402 SPECIFICATIONS
2-1. General
A. Input specifications
: Dual high impedance inputs
(2 x 10
13
Ω
) with provision for
liquid earth connection.
Suitable for inputs from glass
or enamel pH & reference
sensors and ORP metal elec-
trodes.
B. Input ranges
- pH
: -2 to 16 pH
- ORP
: -1500 to 1500 mV
- rH
: 0 to 55 rH
- Temperature
: -30 to 140 ºC
(-20 -to 300 ºF)
(for 8k55 sensor -10 to
120 ºC (10 to 250 ºF);
for 10kPTC sensor -20 to
140 ºC (0 to 300 ºF))
C. Span
- pH
: min 1
max 20 pH
- ORP
: min 100
max 3000 mV
- rH
: min 2
max 55 rH
- Temperature
: min 25 ºC max 200
0
C
min 50 ºF
max 400
0
F
(for 8k55 sensor max 100 ºC
(250 ºF))
D. Transmission Signals
: Two isolated outputs of 0/4-
20 mA DC with common neg-
ative.
Maximum load 600
Ω
.
Auxiliary output can be cho-
sen from pH, temperature,
ORP or rH (with suitable sen-
sor), P.I. control. burn up
(22 mA) or burn down (0/3.5
mA) to signal failure.
E. Temperature compensation
- Range
: Automatic or manual com-
pensation to Nernst equation.
Process compensation by
configurable temperature
coefficient.
Adjustable ITP (Isothermal
point of intersection).
F. Calibration
: Semi-automatic using precon-
figured NIST buffer tables 4, 7
& 9, or with user defined
buffer tables, with automatic
stability check.
Manual adjustment to grab
sample.
Slope and Asymmetry
Potential setting.
Zero point can be selected for
calibration and display instead
of As. Pot. (IEC746-2)
G. Serial Communication
: Bi-directional according to the
EIA-485 standard using HART
protocol and PC402 software.
H. Logbook
: Software record of important
events and diagnostic data.
Available through RS485, with
key diagnostic information
available in the display.
I. Display
: Custom liquid crystal display,
with a main display of 3
1
/
2
dig-
its 12.5 mm high. Message
display of 6 alphanumeric
characters, 7 mm high.
Warning flags and units (pH
and mV) as appropriate.
J. Contact outputs
- General
: Four (4) SPDT relay contacts
with LED indicators. For S1,
S2, and S3, the LED is on
when relay is powered.
NOTE: For S4 (FAIL) LED
lights when power is
removed (Fail safe).
Contact outputs configurable
for hysteresis and delay time.
- Switch capacity : Maximum values 100 VA,
250 VAC, 5 Amps.
Maximum values 50 Watts,
250 VDC, 5 Amps.
- Status
: High/Low process alarms,
selected from pH, ORP, rH
and temperature.
Contact output is also avail-
able to signal “Hold Active”
- Control function : On / Off
PI pulsed
Proportional duty cycle con-
trol with integral term.
PI frequency
Proportional frequency control
with integral term. In addition
wash cleaning control signal
on S3, and FAIL alarm for
system and diagnostic errors
on S4
Содержание PH402G
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