Advanced Functions; Switching To The Engineering (Eng) Menu; Ma Filter [4_20 Fltr]; Changing The 4-20 Ma Filter - Pentair GOYEN MECAIR PEM Manual

8.1 ADVANCED FUNCTIONS

MENU MEANING
4_20 FLTR 4–20 mA output settings
ALA1 Alarm settings for Relay 1
PL.ST Plant Stop
R485 Modbus RS-485 output
ENG Engineering functions

8.1.1 Switching to the Engineering (ENG) Menu

1. Move the jumper from LK4 to LK3.
2. Press the RESET button.
The additional menus are now available. See Figure 7 on page 20 of this manual for the full Engineering menu.
Note that the menu shown is based on scaling option 2 [%], see Figure 6 on page 17 or basic menu functions
for scaling option 1 [SF].
8.2 4–20 MA FILTER [4_20 FLTR]
The 4–20 mA settings menu allows the Filter [FLTR] of the 4–20 mA outputs to be set. The Filter value sets the amount of
smoothing on the output (a walking window filter). To set the 4–20 mA to track the display output you need to set the filter
time here to the same value as the display filter time.
For logging purposes, you may wish to leave the 4–20 mA unfiltered (default: 1 s) and only set the display filter.
8.2.1 Changing the 4–20 mA Filter
1. Enter the password, if required (see section 7.2 on page 18).
2. Scroll DOWN to the 4_20 menu heading.
3. Press RIGHT: display shows FLTR.
4. Press RIGHT again: display shows the 4–20 mA filter time (default 0005 = 5 s).
5. Adjust the value then press RIGHT to return to the main menu heading.
NOTE on the range of allowed values:
FILTER: this is an integer value. Allows values between 1 and 9999 seconds.

8.3 EMISSION ALARM SETTINGS [ALA1]

The Alarm Settings menu [ALA1] is used to set up emission alarms used to activate alarm relays in the sensor. Alternatively,
you can output the dust reading to your own system (using analogue or Modbus outputs), then set emission alarms in your
own system. The ALA1 menu applies to Relay 1. The alarm uses the value from the display to generate alarms.
MENU RELAY
ALA1 Relay 1 (this is also activated in case of a self-test fail)

8.3.1 Set Point [SP1]

The alarms can be set with different set points; this allows you to set a Limit (High High) alarm level (refer to the
menu map on page 20). It is recommended to set the Limit Alarm to your regulatory compliance emission limit.
To disable an alarm trigger point, set the Set Point value to 000.0. (Note that set points are disabled by default.)

8.3.2 Averaging Filter

Averaging for the alarms depends on the smoothing filter set in the Display menu [DISP | FILT]. For regulatory
compliance it is recommended to set up to the averaging time specified in your regulation.
Typical values are: 30 min (= 1800 s) or 1 hour (= 3600 s).
HINT: Lower filter times can be used if you need to quickly detect sudden changes in dust reading.

8.3.3 Alarm Delay [DEL1]

The alarm delay is used to prevent temporary high dust spikes – typically generated on process start-up or during
bag-filter cleaning – from generating unnecessary alarms. The default alarm delay is 5 seconds. Increase this as
required to the duration of the dust spikes you are seeing.
INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD PEM MANUAL – PARTICULATE EMISSION MONITOR
DESCRIPTION
Adjust filter on the 4–20 mA output
View/adjust the alarm set point and delay for Relay 1
Adjust the behaviour of the plant run/plant stop feature
Adjust the settings for the Modbus RS-485 output
• 4–20 mA trim settings
• Test functions
• Factory reset
ALARM LED
GREEN > RED (Limit alarm)
21