ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0016 00
OPERATOR INSTRUCTIONS
MAINTAINING NORMAL OPERATION UNDER USUAL CONDITIONS
MC-TWPS TDS Measurement
1. Remove the Portable TDS meter with its case from the pack-out box (see Figure 2).
Operation
TEST WELL
Manual
Model 6P
CALIBRATION SOLUTIONS
TDS METER
Figure 2. MC-TWPS Portable TDS Meter Kit.
2. Check / calibrate the Portable TDS Meter (if not calibrated within the last 30 days) as follows:
a. Remove the calibration solutions marked KCl-70 and KCl-18000.
b. Rinse the test well 3 times with product water from the Product Utility Hose.
c. Blow the excess water out of the cup.
d. Rinse the test well three times with the KCl-70 calibration solution.
e. Then fill the well to the top with calibration solution.
f. Press COND, then press CAL.
g. Use UP DOWN arrows to adjust the value to agree with the calibration solution.
1) KCl-70 should read 70 us/cm
2) KCl-18000 should read 18 ms/cm
h. Press CAL again.
i. Repeat using the KCl-18000 solution
3. Always measure the product TDS before measuring the raw water TDS.
4. Sample the product using the product utility hose located on the TWPS. Open the valve and let
the water flow for a short time. Rinse the TDS meter test well 3 times, then fill the well.
a. If the TDS reference (far left of display) is set to "NaCl", press "TDS" and record the
reading.
b. If the TDS reference (far left of display) is not set to "NaCl", press "TDS" and then press
and hold CAL until the "SEL". Is displayed.
c. Use the up/down arrows to change the TDS reference to "NaCl"
d. Press CAL again. Press TDS and record the reading.
5. Sample the raw water from the MF Feed Strainer drain or the in-line strainer drain. Open the
valve and let the water flow for a short time. Rinse the meter test well 3 times, then fill the well.
a. If the raw water is seawater or brackish water expected to be over 5000 mg/L, use the
NaCl TDS reference setting. Press TDS and record the reading.
b. If the raw water is expected to less than 5000 mg/L, set the TDS reference to "442"
1) Press "TDS" and then press and hold CAL until the "SEL". Is displayed.
2) Use the up/down arrows to change the TDS reference to "442"
3) Press CAL again. Press TDS and record the reading.
0016 00-5
