Hoffman AMHUM crosses to Pfannenberg FLZ 600 (17207000000). Hoffman ATEMHUM crosses to Pfannenberg FLZ 610: 17218151000 for a 115 V AC supply or 17218100000 for 230 V AC. Both Pfannenberg parts snap onto 35 mm DIN rail and have a changeover contact, like the Hoffman parts. The tables below show where the ratings differ.
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Quick cross
| Hoffman (nVent) | What it is | Pfannenberg | Part number |
|---|---|---|---|
| AMHUM | Mechanical hygrostat | FLZ 600 | 17207000000 |
| ATEMHUM | Electronic hygrotherm (humidity and temperature) | FLZ 610, 115 V AC | 17218151000 |
| ATEMHUM | Electronic hygrotherm (humidity and temperature) | FLZ 610, 230 V AC | 17218100000 |
AMHUM vs FLZ 600: mechanical hygrostat
| Spec | Hoffman AMHUM | Pfannenberg FLZ 600 |
|---|---|---|
| Setting range | Adjustable (range not on the nVent sheet; ask us) | 40 to 90% RH |
| Switching difference | Not on the nVent sheet | About 5% RH |
| Contact | Changeover | Changeover |
| Max switching, resistive | 5 A at 250 V AC | N.O.: 5 A, N.C.: 2 A, 24 to 250 V AC |
| Max switching, inductive | 0.2 A at 250 V AC (cos φ 0.8) | 0.2 A (cos φ 0.6) |
| Min switching | 100 mA at 20 V AC/DC | 100 mA |
| DC rating | 20 W | Ask |
| Operating temperature | 32 to 140°F (0 to 60°C) | 32 to 140°F (0 to 60°C) |
| Size H x W x D | 2.64 x 1.97 x 1.50 in (67 x 50 x 38 mm) | 2.52 x 1.46 x 1.81 in (64 x 37 x 46 mm) |
| Weight | 2.0 oz (60 g) | 1.9 oz (55 g) |
| Mounting | 35 mm DIN rail | 35 mm DIN rail |
| Listing | cURus E164102, CE | UL |
Watch the N.C. side. FLZ 600 is rated 5 A on the N.O. contact but 2 A on the N.C. contact. AMHUM is 5 A on its changeover contact. Check which FLZ 600 contact your heater or fan sits on, using the Pfannenberg terminal diagram. If the load is over the rating for that contact, switch a relay or contactor coil instead.
ATEMHUM vs FLZ 610: electronic hygrotherm
| Spec | Hoffman ATEMHUM | Pfannenberg FLZ 610 |
|---|---|---|
| Supply voltage | 100 to 240 V AC (one part) | 115 V AC (17218151000) or 230 V AC (17218100000) |
| Humidity setting | 50 to 90% RH | 40 to 90% RH |
| Temperature setting | 32 to 140°F (0 to 60°C) | 32 to 140°F (0 to 60°C) |
| Temperature hysteresis | About 2 K ±1 K | About 2 K ±1 K |
| Humidity hysteresis | Not on the nVent sheet | About 4% RH ±1% |
| Contact | Changeover, relay | Changeover, relay |
| Max switching | 10 A resistive, 1.6 A inductive at 240 V AC | 8 A (3 A inductive) at 120 or 240 V AC; 4 A at 24 V DC |
| Display | LED | LED |
| Operating temperature | -40 to 140°F (-40 to 60°C) | -4 to 140°F (-20 to 60°C) |
| Size H x W x D | 3.03 x 2.36 x 1.69 in (77 x 60 x 43 mm) | 3.17 x 2.32 x 1.50 in (80.5 x 59 x 38 mm) |
| Mounting | 35 mm DIN rail, vertical | 35 mm DIN rail |
| Listing | cURus E164102, CE | UL |
Three things to check on an ATEMHUM swap. 1) Pick the FLZ 610 by supply voltage; ATEMHUM is one part for 100 to 240 V. 2) FLZ 610 resistive rating is 8 A vs 10 A on ATEMHUM. A heater over 8 A needs a relay or a smaller heater. Inductive is the other way: 3 A on FLZ 610 vs 1.6 A. 3) FLZ 610 is rated down to -4°F ambient vs -40°F for ATEMHUM. In an unheated outdoor box that sits below -4°F, tell us and we look at it with you.
On ATEMHUM, terminals 3 and 5 close on humidity rise or temperature drop (heaters, dehumidifiers), and 4 and 5 close on humidity drop or temperature rise (fans, cooling). Wire the FLZ 610 to its own terminal diagram on the Pfannenberg sheet; do not assume the same terminal numbers.
Sources: nVent Hoffman Mechanical Hygrostat (AMHUM) and Electronic Hygrotherm (ATEMHUM) catalog performance data pages and nvent.com product pages; Pfannenberg FLZ 600 / FLZ 610 product sheet and pfannenberg.com FLZ 600 / 610 page. "Not on the nVent sheet" means nVent does not publish that value on the pages we used. Check current datasheets before you substitute.
Why a hygrostat at all
nVent puts the critical humidity for most components at 65% RH. Above that, water can condense on boards and terminals. A hygrostat turns on a heater when humidity climbs, so the air in the box stays above the dew point. Size the heater on the outdoor control panel page or pick one from enclosure heaters.
Common questions
What replaces a Hoffman AMHUM?
Pfannenberg FLZ 600, part number 17207000000. Both are mechanical hygrostats with a changeover contact on 35 mm DIN rail. FLZ 600 sets 40 to 90% RH. Its N.C. contact is rated 2 A, its N.O. contact 5 A.
What replaces a Hoffman ATEMHUM?
Pfannenberg FLZ 610. Use 17218151000 on 115 V AC or 17218100000 on 230 V AC. Both sense humidity and temperature and switch a changeover relay rated 8 A at 120 or 240 V AC.
Can one FLZ 610 run on 120 V and 240 V like ATEMHUM?
No. FLZ 610 comes in a 115 V and a 230 V version. ATEMHUM takes 100 to 240 V AC. Order the FLZ 610 that matches your control voltage.
Is there a thermostat-only cross too?
Yes. Hoffman ATEMNCF, ATEMNOF and THERM16 and THERM26 thermostats cross to Pfannenberg FLZ 520 and FLZ 530 on the Hoffman thermostat cross page.
Get it crossed and quoted
Send the Hoffman part number, the control voltage and the heater or fan it switches. We send back the Pfannenberg part and the wiring.
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Related: Hoffman thermostat cross · Hoffman DAH heater cross · Thermostats and hygrostats · Enclosure heaters · All cross references
nVent, Hoffman and Pfannenberg are trademarks of their owners. Applied Control Inc. is not affiliated with nVent. Names appear only to identify the part being replaced.