TSI Instruments HM685, Owner'S Manual

Page: 33 / 93

Getting Started 2-13
D i s c o n n e c t i n g t h e M a n o m e t e r f r o m t h e
T e s t P o i n t s
C a u t i o n s

Exercise caution when disconnecting the HM685 Hydronic Manometer
from a pressurized system. Water or air discharged under pressure
poses a potential risk of severe injury.

Exercise caution in using the HM685 Hydronic Manometer near
electrical equipment. Water spray associated with purging or
disconnecting hoses presents a potential risk of damage to such
equipment.

Thoroughly drain and dry the HM685 Hydronic Manometer hoses and
internal piping after each use. This will help in limiting the potential for
growth of hazardous microorganisms.
The following provides a guideline for disconnecting the manometer from
the test points once measurements have been completed.
1. Turn the shut-off ball valve on both the High and Low pressure hoses
to the closed position.
2. Disconnect the High pressure (red) hose from the higher line pressure
test point.
3. Disconnect the Low pressure (blue) hose from the lower line pressure
test point.
Note: If additional measurements at another location/system containing
the same fluid are to be made, it is not necessary to proceed to
step 4 and drain the fluid entrained within the hoses at this time.
The fluid remaining within the hoses will help minimize the time
necessary to bleed entrained air prior to making subsequent
measurements.
4. Place the open end of the Low pressure (blue) hose in a suitable
receptacle or near a drain.
5. Turn the valve handle on the manometer to the BYPASS position.
6. Turn the shut-off ball valve on the Low pressure (blue) hose to the
open position to discharge the pressurized fluid out of the open end of
the Low pressure (blue) hose.
7. Elevate the High pressure (red) hose and turn its shut-off ball valve to
the open position to allow for draining of the remaining entrained fluid.