CM14 Commissioning
Endress+Hauser 25
• UPW NaCl: optimized for pH-neutral impurities
• UPW HCl: optimized for measuring the acid conductivity downstream of a cation exchanger.
Also suitable for ammonia (NH
3
) and caustic soda (NaOH).
6.5.4 Configuration of the relays
The device has two relays with limit values that are either switched off or can be allocated to
the input signal. The limit value is entered as a numerical value including the decimal
position. Limit values are always assigned to a relay. Each relay can be assigned to a channel
or a calculated value. In the "Error" mode, the relay functions as an alarm relay and switches
each time a fault or alarm occurs.
The following settings can be made for each of the 2 limit values: assignment, operating
mode, limit, hysteresis, switching behavior, delay and failure mode.
Limit values for pharmaceutical water according to United States Pharmacopoeia (USP)
and European Pharmacopoeia (EP) (only for conductive sensors)
For conductive sensors, the transmitter has functions for monitoring "Water for Injection"
(WFI), "Highly Purified Water" (HPW) and "Purified Water" (PW) according to the United
States Pharmacopoeia (USP) Part 645 and European Pharmacopoeia (EP) standards.
USP function: The temperature-dependent limit values in the following table apply for "Water
for Injection" (WFI) according to USP and EP and for "Highly Purified Water" (HPW) according
to EP. The table is programmed into the transmitter.
Temperature [°C] Conductivity [µS/cm] Temperature [°C] Conductivity [µS/cm]
0 0.6 55 2.1
5 0.8 60 2.2
10 0.9 65 2.4
15 1.0 70 2.7
20 1.1 75 2.7
25 1.3 80 2.7
30 1.4 85 2.7
35 1.5 90 2.7
40 1.7 95 2.9
45 1.8 100 3.1
50 1.9
The measurement is performed in the following steps:
• The transmitter determines the uncompensated conductivity and the water temperature.
• The transmitter rounds the temperature down to the nearest 5 °C and compares the
measured conductivity with the associated value in the table.
• If the measured value is greater than the value in the table, an alarm is triggered (E151).
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