Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 35)

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10 RELAYS
The Alpha pH 190 features two SPDT non-powered relays; rated for
6A at 110 VAC, 250 VAC maximum. When your process exceeds
the set parameters of a relay set point, the REL 1 or REL 2 indicator
lights up.
To set parameters for relay 1 and relay 2, see Setup programs P1.0
and P2.0.
11 TRANSMITTER FUNCTION
If remote data logging is required, a 4-20 mA current loop can be
connected. The current will be proportional to the pH (or ORP)
displayed on the panel display.
pH: 0.00 pH – 4 mA; 14.00 pH = 20 mA
ORP: -999 mV = 4 mA; 1000 mV = 20 mA
The 4-20 mA current loop can drive a load resistance of no more
than 200 Ω.
12 ERROR MESSAGES
The following table provides a guideline to enable diagnosis of
possible problems indicated by the messages generated by the
meter.
Error
Message Indicates Possible Cause Corrective
Action
Err1 Calibration
Error
Incorrect buffer solution
used or contamination of
buffer solution resulting
to calibration being
attempted outside the
allowable calibration
window Check if right
buffer solution
was selected or
use fresh buffer
solution.
Err2 Wrong
keypad
input
When an invalid key is
pressed in a selected
mode. Select valid
operations
depending on the
selected mode.