Definitions; Accessories - Hanna Instruments HI 504 Instruction Manual

DEFINITIONS

DEVIATION Same as proportional band, but expressed in units of the
controlled magnitude (e.g. 1pH, 50 mV).
EEPROM Electrically Erasable Programmable Read-only Memory (per-
manent memory).
FAIL SAFE ALARM Signaling of the alarm by de-energizing the alarm relay in-
stead of energizing it. That protects against power failures
and interruptions of the alarm relay external wires.
GLP Good Laboratory Practice.
HYSTERESIS Interval that must be passed over by the controlled magni-
tude in the opposite direction after having activated a relay,
before deactivating it, in order to avoid uninterrupted activa-
tion/deactivation of the relay.
IN-LINE CLEANING Automatic procedure to stop control, clean the electrode and
then activate control again.
NIST National Institute of Standards and Technology.
PID Proportional Integrative Derivative control.
POTENTIAL MATCHING PIN Pin for connection of the potential matching (or grounding)
steel bar, which must be immersed into the measured fluid,
and is used together with a differential input to avoid dam-
age of the reference electrode due to ground loop current.
PROPORTIONAL BAND Interval, measured in percentage of the input range, where
the proportional action spans from 0 to 100 %.
PWM Pulse Width Modulation.
RAM Random Access Memory (non-permanent memory).
RTC Real Time Clock.
SETPOINT Value at which the measurement needs to be controlled.
SOLUTION COMPENSATION Technique for compensating the differences on the
pH of the solution under measurement when its temperature
varies.
THRESHOLD Value above/below which a control or alarm relay is acti-
vated or deactivated.
TRIGGER An event or command that acts like a mechanical trigger in
initiating a process.
WATCHDOG Mechanism for issuing a reset of the device in case it gets
stuck.
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ACCESSORIES

pH CALIBRATION SOLUTIONS
HI 7004M or HI 7004L pH 4.01 Buffer Solution, 230 or 500 ml bottle
HI 7006M or HI 7006L pH 6.86 Buffer Solution, 230 or 500 ml bottle
HI 7007M or HI 7007L pH 7.01 Buffer Solution, 230 or 500 ml bottle
HI 7009M or HI 7009L pH 9.18 Buffer Solution, 230 or 500 ml bottle
HI 7010M or HI 7010L pH 10.01 Buffer Solution, 230 or 500 ml bottle
ORP SOLUTIONS
HI 7020M or HI 7020L Test Solution, 200-275 mV, 230 or 500 ml bottle
HI 7091M or HI 7091L Pretreatment Reducing Solution, 230 or 500 ml bottle
HI 7092M or HI 7092L Pretreatment Oxidizing Solution, 230 or 500 ml bottle
ELECTRODE STORAGE SOLUTIONS
HI 70300M or HI 70300L Storage Solution, 230 or 500 ml bottle
HI 7082 3.5M KCl Electrolyte, 4x50 mL
ELECTRODE CLEANING SOLUTIONS
HI 7061M or HI 7061L General Cleaning Solution, 230 or 500 ml bottle
HI 7073M or HI 7073L Protein Cleaning Solution, 230 or 500 ml bottle
HI 7074M or HI 7074L Inorganic Cleaning Solution, 230 or 500 ml bottle
HI 7077M or HI 7077L Oil & Fat Cleaning Solution, 230 or 500 ml bottle
OTHER ACCESSORIES
HI 504900 Hanna GSM Module
HI 504901 Hanna GSM Supervisor
HI 504902 Hanna RS485 Modem
HI 504910 Digital Transmitter
BL PUMPS Dosing Pumps with Flow Rate from 1.5 to 20 LPH
ChecktempC Stick Thermometer (range -50 to 150°C)
ChecktempF Stick Thermometer (range -58 to 302°F)
HI 7610 Stainless steel Pt100 probe with standard 1/2'' external threads
on both ends for in-line and immersion installation; 5 m
(16.5') cable
HI 7620 Glass Pt100 probe with external PG13.5 thread and 5 m
(16.5') cable
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