Series 1250 Pneumatic Chemical Injection Pump
Operating Manual
Page 8 of 19
Other than during brief testing, NEVER operate the pump without chemical supply available and
flowing freely. Doing so will create undue friction and heat, decreasing the life of the packing,
hastening chemical leakage, and voiding the pump warranty.
FIGURE 2: AMPLIFICATION RATIO TABLE, SERIES 1250
PLUNGER DIAMETER (IN)
AMPLIFICATION RATIO
1/8
399
3/16
176
1/4
99
3/8
43
1/2
24
1.3.6 If you do not have a Gas Recovery pump or if you are not going to be recovering the exhaust gas of your
pump to a lower pressure gas system, skip to
Section 3: Operating The Pump
.
2. GAS RECOVERY SYSTEMS - INSTALLATION
2.1.1 For Gas Recovery (GR) Models (P25-GXX-XXX-XX), the exhaust gas can be recovered to a lower pressure gas
system. Connect the gas recovery line from the process to the open 1/4” tubing connector on the lower branch tee
of the injector. The pressure in the recovery line (“recovery pressure”) must be lower than the supply pressure. To
calculate the recovery pressure given your supply pressure in PSIG, use the following formula:
RECOVERY PRESSURE
= SUPPLY PRESSURE -
[DISCHARGE PRESSURE]
- 30 PSIG
[AMPLIFICATION RATIO]
2.1.2 For a GR pump, the maximum recovery pressure, based on a supply pressure of 200 PSIG (the maximum
allowable supply pressure) is given by:
MAXIMUM RECOVERY PRESSURE
= 170 PSIG -
[DISCHARGE PRESSURE]
[AMPLIFICATION RATIO]
2.1.3 For more information on how to set up a recovery system for the GR Series chemical injectors, please contact
CheckPoint or an authorized distributor. In many cases CheckPoint may elect to run a test at our factory to determine
if the GR will handle your specific needs.
3. PUMP OPERATION
Once you have properly installed the pump, you will need to bleed the air out of the chemical head
prior to operating it.
3.1 Bleeding/Priming the Pump
3.1.1 Prior to bleeding air from the pump head, check to ensure that the packing nut is properly adjusted. Before
attempting to adjust or tighten the packing nut, please read
Section 5.1: Packing Adjustment on page 14.
It is
important not to over-tighten the packing nut.
3.1.2 Open the chemical supply block valve (if necessary) and the air supply block valve or regulator (if used).
3.1.3 Open the process block valve.
CP/MAN-PRD-015 REV. 15 EFF. DATE: 07/08/2022
