Cluster 03 · Filtration

Coolant filtration and water quality for the secondary loop

Side-stream units, cartridges, conductivity and pH, flow and differential pressure. Coolant distribution units and cold plates are outside the range.

Ask for the specification sheet

Piped side-stream filtration vessel mounted on a secondary loop header, with the skid pipework in frame

Side-stream vessel on a loop header.

Finest protection rating 0.05µm

Divert band 5–15% of loop volume

De-ionised loop 0.2–20µS/cm

Glycol-premix loop 50–300µS/cm

Both bands, because the loop type sets the target.

Side-stream filtration

5–15% of loop volume; turnover every 6–12 h.

EMS-CF-S10 · EMS-CF-S15

Filter cartridges

Protection ratings, 100 to 0.05 µm; retention to 99.98%.

EMS-CF-F1-20 · EMS-CF-F0.45-40

Conductivity and pH

k = 0.01 cm^-1 spans the 0.2–20 µS/cm de-ionised band.

EMS-CF-WQ-C · EMS-CF-WQ-PH

Flow and differential pressure

Flow to plus or minus 0.75%; change-out at 35 psid.

EMS-CF-FP-FC · EMS-CF-FP-DP

Seal life

Sealing reliability is the real risk

Heat rejection is sized once against a kW figure. A seal is not: three fluid variables decide its life.

Mechanism, variable, published number. Both micron targets are protection ratings.
Mechanism	Variable	Published number
Particulate abrasion	Suspended solids	cold-plate loops below 5 µm; rear-door heat exchangers below 10 µm
Galvanic corrosion	Conductivity, chloride	glycol-premix loop 50–300 µS/cm, below 50 ppm; de-ionised loop 0.2–20 µS/cm, below 5 ppm
Elastomer swell	Glycol concentration	PG25 basis, 25% v/v
Microchannel erosion	Particle vs channel	channels 100–300 µm; DLC plates 100–400 µm

Half the channel width is the blockage threshold at entrances and bends.

Coolant chemistry

Target bands by loop type

Conductivity and pH carry two bands: two loop chemistries.

Twelve parameters, and the loop type sets every target.
Parameter	De-ionised	Glycol-premix
Conductivity	0.2–20 µS/cm	50–300 µS/cm
pH	8.0–9.5	7.0–9.0
Chloride	5 ppm max	50 ppm max
Hardness	20 ppm max	50 ppm max
Suspended solids	3 ppm max	3 ppm max
Turbidity	1 NTU max	1 NTU max
Dissolved oxygen	2–4 mg/L max	2–4 mg/L max
Glycol	none	25% v/v, PG25 basis
Freeze point	n/a	−10.1 °C
Reserve alkalinity	n/a	1.4 mL 0.1 M HCl, ASTM D1121
Biological	zero growth	zero growth
Verification	50–100 days	50–100 days

First month

Cleanest when the skid ships, dirtiest when commissioned

Residue, weld scale and free iron arrive before the first steady-state week.

Three micron categories, kept apart.
Category	Figure	What it is
Protection rating	7–10× below the finest channel	The rating the operating filter holds
Protection rating	full-flow ~2×; side-stream ~10×	Installed-stage selection rule
Commissioning staging	100, then 50, then 25 µm	Procedure owned by the commissioning guide
Strainer rating	500 µm class at the unit inlet	Protects the pump

Fill and flush connection landed on a secondary loop manifold during first fill and commissioning

Fill connection at a loop manifold.

Commissioning rules

Four field rules for the commissioning month

Passivate

ASTM A380 and A967; one unpassivated part puts free iron in the coolant.

Proof at 1.5×

1.5 times rated maximum working pressure, IEC 62368-1.

Sample after fill

Glycol separates under vacuum.

Watch 2 psid

Clean 2 µm element, 0.17 bar, 2 psid; change-out 35 psid, 2.4 bar.

Sourcing

The documents these bands come from

Every reference is a requirement the product is built to, never an approval held.

Nineteen named documents, grouped by what they govern. IEC 61207 covers gas analysers and does not apply to liquid coolant chemistry or filtration. One sheet per code: EMS-CF-F0.05-40 (PDF).
Governs	Documents
Chemistry	ASHRAE TC 9.9; OCP PG 25; OCP cold plate coolant
Cleanliness	ISO 4406; ISO 16889; ISO 16232; VDA 19.1
Test methods	ASTM D1120, D1121, D1122, D1125, D1177; DIN EN 1262; DIN 51757; DIN 51432-2; ISO 7888
Pressure, passivation	IEC 62368-1, hydrostatic test at 1.5×; ASTM A380 and A967