TSI Instruments HM685, Owner'S Manual

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Getting Started 2-5
6. Reinstall the battery holder. Ensure the battery holder orientation is
such that its terminals make contact with the spring contacts within the
battery compartment.
7. Replace the battery compartment cover.
8. Plug in the AC adapter.
Notes:

Full charge of the batteries is achieved within four (4) hours.

Fully charged batteries should enable the instrument to operate for a
period of at least twelve (12) hours.

The manometer is fully operational while charging batteries.

Never attempt to charge battery types other than AA-size rechargeable
NiMH.

For maximum battery life, ensure the backlight is “off” when not
needed.

Never mix battery types.

NiMH batteries should only be charged at room temperature. Starting
with batteries that are too cold or too warm can cause the charge cycle
to terminate early.
I n s t r u m e n t S t a r t - u p
Upon turning the HM685 Hydronic Manometer on, the meter engages in a
brief self-check while displaying the serial number, model number, and
revision of the instrument being used. While completing the self-check, the
user is given the option to zero the gauge pressure sensor or skip the zero
process prior to proceeding to the Pressure Measurement Screen.
Z e r o i n g t h e M a n o m e t e r
The HM685 Hydronic Manometer is equipped with both a gauge and
differential pressure sensor, allowing for simultaneous measurement and
display of High-side gauge and Differential pressure. The gauge and
differential pressure sensors are zeroed independently of one another.
Zeroing the Gauge Pressure Sensor
To ensure the most accurate gauge pressure ( High P ) measurements, the
HM685 gauge pressure sensor should be zeroed prior to taking readings
on each new system. When not in the instrument start-up sequence, the
gauge pressure sensor is zeroed as follows:
1. Enter the Main Menu by pressing the ENTER ( ) key.
2. Select Zero Gauge Pressure .