8-4
Hydronic Manometer Model HM685
Symptom
Possible Causes
Corrective Action
“-----”
on display
The temperature sensor is
unplugged
The pressure measurement is
out of the meter’s range.
Try one of the below two steps:
1. Plug in temperature probe.
2. Return the pressure measurement to
the correct range
Instrument
unresponsive to
pressure
Hoses are clogged
Make sure hoses and flow restrictors are
unclogged from any debris by following
instructions on
The following table lists error messages which can be displayed should the
instrument detect a problem. Should any of these error messages recur
repeatedly, the instrument should be returned to the factory for servicing.
Error Message
Possible Causes & Corrective Action
"Lithium Battery Low”
The battery which runs the real-time clock and saves data logging
information is depleted and should be replaced. Please return the
unit to factory to replace the battery.
"Reading Logged Data”
There was a problem with the logged data. The user should
download their logged data as soon as practical and then execute
the “Delete All” command to re-initialize data logging. If the lithium
battery is depleted, this could also cause an error reading logged
data.
"Saved Measurement Params”
There was a problem with the measurement parameters read from
memory. They should be checked to make sure they still represent
the user’s desired settings. Measurement parameters are Cv/Kv,
selected fluid, time constant, and measurement units.
"Saved User Config”
There was a problem with the user configuration read from
memory. It should be checked to make sure it still represents the
user’s desired settings. These are settings that do not impact
measurements
– contrast, logging mode, log sample intervals,
backlight setting time & date format, decimal setting (commas or
periods), beeper enable setting and auto power-down setting
"Saved Pressure Zero”
There was a problem with a pressure zero reading read from
memory. Differential pressure and gauge pressure should both be
re-zeroed.
Содержание HM685
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